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  • Browser-based Operating System

    - by Ross Peoples
    I have a bunch of touchscreen machines that I want to display a webpage on and have users interact with the webpage via the touchscreen. Right now, this is done with a full-blown OS with a browser set to run at startup. I think maybe the ideal solution is to use a Linux-based OS that boots up, starts X, then starts a web browser (Chrome, Firefox, or whatever) in full screen mode. What kind of options do I have? I really want to avoid using a full-blown OS like I do now. It looks unprofessional and takes a while to boot up. I was thinking maybe Chrome OS or something, but I wouldn't know how to set it up for my purposes, since it's still designed to be used as a desktop OS instead of a kiosk-type OS.

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  • System Centre Essentials 2007 Clients Losing Status

    - by David Collie
    Clients that have been reporting their state fine suddenly start reporting "Windows 0.0" for their OS and "Not yet contacted" for their Last Contacted date even though previously these values were present and correct. Any idea why this might be happening? I've spend a long time playing with wsauclt etc and just when I think I've the problem it comes back again! Thanks.

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  • How does Amazon EC2 operating system licensing work?

    - by JP
    Hello, I'm new to the cloud and EC2 and am wondering how licensing of operating systems works. Specifically, i spent some time looking at amazon machine images (ami's) and some contain windows and sql server. My question is how does the licensing work: a) Do I install my own licenses once the boxes are available? b) Are these licenses covered by my Amazon bill c) what are any costs associated with this software? Thank in advance, JP

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  • Programming languages with a Lisp-like syntax extension mechanism

    - by Giorgio
    I have only a limited knowledge of Lisp (trying to learn a bit in my free time) but as far as I understand Lisp macros allow to introduce new language constructs and syntax by describing them in Lisp itself. This means that a new construct can be added as a library, without changing the Lisp compiler / interpreter. This approach is very different from that of other programming languages. E.g., if I wanted to extend Pascal with a new kind of loop or some particular idiom I would have to extend the syntax and semantics of the language and then implement that new feature in the compiler. Are there other programming languages outside the Lisp family (i.e. apart from Common Lisp, Scheme, Clojure (?), Racket (?), etc) that offer a similar possibility to extend the language within the language itself? EDIT Please, avoid extended discussion and be specific in your answers. Instead of a long list of programming languages that can be extended in some way or another, I would like to understand from a conceptual point of view what is specific to Lisp macros as an extension mechanism, and which non-Lisp programming languages offer some concept that is close to them.

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  • iphone app crash, crash log posted, help please

    - by terry jones
    hi, we recenty had a programmer to develop a program for us but seems to have left us in the lurch with a part functioning application. my boss isnt happy at moment as we have spent a few hundred and have nothing to show for it at the moment. can anyone see any information in the crash log below as its gibberish to me. Incident Identifier: D4F482FE-167A-44BB-A642-7E8EF7B568BF CrashReporter Key: 2d8e2d17415c55e48ec20dae7cbe6c36b33bcce1 Process: Logistics [328] Path: /var/mobile/Applications/32A03443-ADE3-4AAE-AB32-05DB7BEB15D8/Logistics.app/Logistics Identifier: Logistics Version: ??? (???) Code Type: ARM (Native) Parent Process: launchd [1] Date/Time: 2010-03-29 17:07:06.474 +0200 OS Version: iPhone OS 3.1.2 (7D11) Report Version: 104 Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x00000000, 0x00000000 Crashed Thread: 0 Thread 0 Crashed: 0 libSystem.B.dylib 0x31a279ac 0x319a9000 + 518572 1 libSystem.B.dylib 0x31a2799c 0x319a9000 + 518556 2 libSystem.B.dylib 0x31a2798e 0x319a9000 + 518542 3 libSystem.B.dylib 0x31a3c63a 0x319a9000 + 603706 4 libstdc++.6.dylib 0x3361d3b0 0x335d8000 + 283568 5 libobjc.A.dylib 0x32401858 0x323fc000 + 22616 6 libstdc++.6.dylib 0x3361b776 0x335d8000 + 276342 7 libstdc++.6.dylib 0x3361b7ca 0x335d8000 + 276426 8 libstdc++.6.dylib 0x3361b896 0x335d8000 + 276630 9 libobjc.A.dylib 0x32400714 0x323fc000 + 18196 10 CoreFoundation 0x32537b86 0x32511000 + 158598 11 CoreFoundation 0x32537b24 0x32511000 + 158500 12 Foundation 0x3145ddaa 0x313ed000 + 462250 13 Foundation 0x31454ee2 0x313ed000 + 425698 14 Logistics 0x00002df8 0x1000 + 7672 15 CoreFoundation 0x32569ede 0x32511000 + 364254 16 UIKit 0x32ba205e 0x32b60000 + 270430 17 UIKit 0x32bf4d4e 0x32b60000 + 609614 18 CoreFoundation 0x32569ede 0x32511000 + 364254 19 UIKit 0x32ba205e 0x32b60000 + 270430 20 UIKit 0x32ba1ffe 0x32b60000 + 270334 21 UIKit 0x32ba1fd0 0x32b60000 + 270288 22 UIKit 0x32ba1d2a 0x32b60000 + 269610 23 UIKit 0x32ba263e 0x32b60000 + 271934 24 UIKit 0x32ba1656 0x32b60000 + 267862 25 UIKit 0x32ba1032 0x32b60000 + 266290 26 UIKit 0x32b9d928 0x32b60000 + 252200 27 UIKit 0x32b9d3a0 0x32b60000 + 250784 28 GraphicsServices 0x32913b72 0x3290f000 + 19314 29 CoreFoundation 0x32567c26 0x32511000 + 355366 30 CoreFoundation 0x32567356 0x32511000 + 353110 31 GraphicsServices 0x32912cb8 0x3290f000 + 15544 32 GraphicsServices 0x32912d64 0x3290f000 + 15716 33 UIKit 0x32b62768 0x32b60000 + 10088 34 UIKit 0x32b6146c 0x32b60000 + 5228 35 Logistics 0x000023c4 0x1000 + 5060 36 Logistics 0x00002380 0x1000 + 4992 Thread 1: 0 libSystem.B.dylib 0x319a9818 0x319a9000 + 2072 1 libSystem.B.dylib 0x319abff8 0x319a9000 + 12280 2 CoreFoundation 0x325677f6 0x32511000 + 354294 3 CoreFoundation 0x32567356 0x32511000 + 353110 4 WebCore 0x305d59de 0x30578000 + 383454 5 libSystem.B.dylib 0x319cd92a 0x319a9000 + 149802 Thread 2: 0 libSystem.B.dylib 0x31a28228 0x319a9000 + 520744 1 libSystem.B.dylib 0x319d3244 0x319a9000 + 172612 2 libSystem.B.dylib 0x319d2d0e 0x319a9000 + 171278 3 CoreMedia 0x33552b04 0x3354f000 + 15108 4 CoreMedia 0x33552a3a 0x3354f000 + 14906 5 MediaToolbox 0x31e1b50c 0x31e18000 + 13580 6 libSystem.B.dylib 0x319cd92a 0x319a9000 + 149802 Thread 0 crashed with ARM Thread State: r0: 0x00000000 r1: 0x00000000 r2: 0x00000001 r3: 0x383c43cc r4: 0x00000006 r5: 0x3361b30d r6: 0x00172f5c r7: 0x2fffe97c r8: 0x2fffe968 r9: 0x00000065 r10: 0x00007150 r11: 0x334bd104 ip: 0x00000025 sp: 0x2fffe97c lr: 0x31a279a3 pc: 0x31a279ac cpsr: 0x00000010 Binary Images: 0x1000 - 0x6fff +Logistics armv6 <350fc970d77b4d8d67bf43f4d7f2a68c> /var/mobile/Applications/32A03443-ADE3-4AAE-AB32-05DB7BEB15D8/Logistics.app/Logistics 0x2c000 - 0x2dfff dns.so armv7 <35ac487c38e38ed5810d5ed0d5c67546> /usr/lib/info/dns.so 0x2fe00000 - 0x2fe24fff dyld armv7 <5db9f5d0275997de58efff111816706e> /usr/lib/dyld 0x30028000 - 0x3004ffff ContentIndex armv7 <67165d749b79ad4b14c8a24f14dab29d> /System/Library/PrivateFrameworks/ContentIndex.framework/ContentIndex 0x30050000 - 0x30054fff ITSync armv7 <a0bf9af6f4ebc7e5977d3da853671162> /System/Library/PrivateFrameworks/ITSync.framework/ITSync 0x30149000 - 0x3016efff AppSupport armv7 <ca2e9a4f0475af20028968840ab94ecf> /System/Library/PrivateFrameworks/AppSupport.framework/AppSupport 0x30175000 - 0x3017ffff MobileCoreServices armv7 <36d71cd8dd49f5d5addb356f449b562a> /System/Library/Frameworks/MobileCoreServices.framework/MobileCoreServices 0x30184000 - 0x30184fff Accelerate armv7 <939f94df6c7e6e7a090ddee1ec09c844> /System/Library/PrivateFrameworks/Accelerate.framework/Accelerate 0x30185000 - 0x301b7fff iCalendar armv7 <235e05f7e167e6dbbd75528a4a37f3a3> /System/Library/PrivateFrameworks/iCalendar.framework/iCalendar 0x301b8000 - 0x301c3fff libz.1.dylib armv7 <8faba7ded9b3527ccf54c2f224f9a12f> /usr/lib/libz.1.dylib 0x301c4000 - 0x301eefff CoreText armv7 <821e9c7c935b6a8d735e2d2d9ebcee04> /System/Library/PrivateFrameworks/CoreText.framework/CoreText 0x301f6000 - 0x301fffff IAP armv7 <36e57cf20df9fcea10ebd0d1c3526a9a> /System/Library/PrivateFrameworks/IAP.framework/IAP 0x30247000 - 0x30279fff MessageUI armv7 <51d0498fb3dba758dae660754f1afb9c> /System/Library/Frameworks/MessageUI.framework/MessageUI 0x3027a000 - 0x3027efff MobileMusicPlayer armv7 <f0e7d2d2d69e9cc2a84e20bced0e1d07> /System/Library/PrivateFrameworks/MobileMusicPlayer.framework/MobileMusicPlayer 0x302c6000 - 0x302cefff CoreVideo armv7 <9259f5ae2a74b53e4f13b27fa3d511e8> /System/Library/PrivateFrameworks/CoreVideo.framework/CoreVideo 0x30348000 - 0x3034afff CrashReporterSupport armv7 <a0a25c381e45f8a3f4ec63bcb17a5a39> /System/Library/PrivateFrameworks/CrashReporterSupport.framework/CrashReporterSupport 0x304a3000 - 0x304cefff MIME armv7 <55a4de1d243273ee7ef4e86a85d591f5> /System/Library/PrivateFrameworks/MIME.framework/MIME 0x304cf000 - 0x3050ffff libsqlite3.dylib armv7 <c2b5985d8307d73b39140e76adfd2eb7> /usr/lib/libsqlite3.dylib 0x3054a000 - 0x30569fff Bom armv7 <37e498957087af50894156808e0a486b> /System/Library/PrivateFrameworks/Bom.framework/Bom 0x30578000 - 0x30a4efff WebCore armv7 <4e2bac4e01a15979c9ac096f78280db0> /System/Library/PrivateFrameworks/WebCore.framework/WebCore 0x30a58000 - 0x30b12fff Message armv7 <a5a7de97c57a6965f27547bf8ff8810c> /System/Library/PrivateFrameworks/Message.framework/Message 0x30b13000 - 0x30b13fff vecLib armv7 <4eb91bf56603dc0db6784d8d3240bfa8> /System/Library/PrivateFrameworks/Accelerate.framework/Frameworks/vecLib.framework/vecLib 0x30c1e000 - 0x30c23fff ProtocolBuffer armv7 <91af9ee5b2f271cbd8c138b3c61e508d> /System/Library/PrivateFrameworks/ProtocolBuffer.framework/ProtocolBuffer 0x30d05000 - 0x30d29fff SystemConfiguration armv7 <c57df668b510f025ee5a173ad30fb48e> /System/Library/Frameworks/SystemConfiguration.framework/SystemConfiguration 0x30d6c000 - 0x30decfff QuartzCore armv7 <af0722911ffc74fc08075e9831a6222e> /System/Library/Frameworks/QuartzCore.framework/QuartzCore 0x30e5d000 - 0x30e72fff libresolv.9.dylib armv7 <2b6a9404652dd2b5abd1c6a5583e8533> /usr/lib/libresolv.9.dylib 0x30e73000 - 0x30ebdfff GMM armv7 <72c87b3b08ab4359802b6efed472bf46> /System/Library/PrivateFrameworks/GMM.framework/GMM 0x30ec7000 - 0x30ed0fff SpringBoardServices armv7 <17ca8b5262cd6484d41efdc72c6fd057> /System/Library/PrivateFrameworks/SpringBoardServices.framework/SpringBoardServices 0x30ed1000 - 0x30f43fff LDAP armv7 <a5f6d51ebcab28eeabe0f2bbbdeb8cc7> /System/Library/PrivateFrameworks/LDAP.framework/LDAP 0x30fe6000 - 0x30ffbfff OpenGLES armv7 <be80a5e4c55c2920be2c31f740bb9dba> /System/Library/Frameworks/OpenGLES.framework/OpenGLES 0x31003000 - 0x31009fff libkxld.dylib armv7 <04ab19af95239c12a98539478eebc560> /usr/lib/system/libkxld.dylib 0x3114f000 - 0x311acfff MediaPlayer armv7 <1021fc5da1419ba297464f71049ad084> /System/Library/Frameworks/MediaPlayer.framework/MediaPlayer 0x311ad000 - 0x311cefff CoreLocation armv7 <a3857b8324f90ae48994df15fdfbcda6> /System/Library/Frameworks/CoreLocation.framework/CoreLocation 0x311d5000 - 0x31214fff Celestial armv7 <f8bde8e040e6aac9e36e0aa8b43ee8cc> /System/Library/PrivateFrameworks/Celestial.framework/Celestial 0x312f6000 - 0x312fcfff libgcc_s.1.dylib armv7 <263b2691cd12171b31fa600716104e4a> /usr/lib/libgcc_s.1.dylib 0x31338000 - 0x31367fff libCGFreetype.A.dylib armv7 <2ec5ad6812f5ea3859cb4189d62b7265> /System/Library/Frameworks/CoreGraphics.framework/Resources/libCGFreetype.A.dylib 0x31393000 - 0x313cafff IOKit armv7 <0afabe8bf08fc163ba8e4ed614092cd3> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit 0x313e9000 - 0x313eafff IOMobileFramebuffer armv7 <9d9f0254b5b64ced3d58191748f3027b> /System/Library/PrivateFrameworks/IOMobileFramebuffer.framework/IOMobileFramebuffer 0x313ed000 - 0x314e2fff Foundation armv7 <ede5b943f529ce1b862c15dc876992c1> /System/Library/Frameworks/Foundation.framework/Foundation 0x314ed000 - 0x31599fff libxml2.2.dylib armv7 <a491bfc5f062f33185a3f98969bae3c2> /usr/lib/libxml2.2.dylib 0x315fc000 - 0x315fefff MobileInstallation armv7 <b8ebf64838bdfe5315dab5745482e30c> /System/Library/PrivateFrameworks/MobileInstallation.framework/MobileInstallation 0x31919000 - 0x31923fff MobileBluetooth armv7 <bc6cf9563c3a14a86cde6ddf6cc3ed45> /System/Library/PrivateFrameworks/MobileBluetooth.framework/MobileBluetooth 0x31926000 - 0x319a8fff WebKit armv7 <b9b7246a09f5db68e44497d318cb3ab6> /System/Library/PrivateFrameworks/WebKit.framework/WebKit 0x319a9000 - 0x31aa0fff libSystem.B.dylib armv7 <3f94d4b13815a93cbdfc6c7dc2afe5b4> /usr/lib/libSystem.B.dylib 0x31aa2000 - 0x31b8bfff AudioToolbox armv7 <393fa1e155bb0523c2a90555bb394498> /System/Library/Frameworks/AudioToolbox.framework/AudioToolbox 0x31b8d000 - 0x31bfcfff CFNetwork armv7 <b55671f2472fdae3f811ae6f636b4e2e> /System/Library/Frameworks/CFNetwork.framework/CFNetwork 0x31cb2000 - 0x31d12fff AddressBookUI armv7 <5e5b83d3c9e2c0676671feebfb8d37c9> /System/Library/Frameworks/AddressBookUI.framework/AddressBookUI 0x31d19000 - 0x31d21fff AccountSettings armv7 <37a8916d02c399bfccc56e92ad68e84b> /System/Library/PrivateFrameworks/AccountSettings.framework/AccountSettings 0x31d28000 - 0x31d34fff MobileDeviceLink armv7 <d757be3521f8ed71709728790c29bdb2> /System/Library/PrivateFrameworks/MobileDeviceLink.framework/MobileDeviceLink 0x31d3a000 - 0x31d3cfff Notes armv7 <f7c579348cb58b5f2218c042cf46f422> /System/Library/PrivateFrameworks/Notes.framework/Notes 0x31d59000 - 0x31d5cfff IOSurface armv7 <81661b8e151a9af6ce5704a728e12dc7> /System/Library/PrivateFrameworks/IOSurface.framework/IOSurface 0x31e18000 - 0x31ed8fff MediaToolbox armv7 <b9023dc22073ab28f6fb8ecbe00951c2> /System/Library/PrivateFrameworks/MediaToolbox.framework/MediaToolbox 0x31ed9000 - 0x31f8dfff JavaScriptCore armv7 <d3434c868a9a0f4016ed32ba90a35c4d> /System/Library/PrivateFrameworks/JavaScriptCore.framework/JavaScriptCore 0x31f91000 - 0x320e6fff CoreGraphics armv7 <5852bd39fd1ef304da7b017949755cab> /System/Library/Frameworks/CoreGraphics.framework/CoreGraphics 0x32150000 - 0x3217cfff DAVKit armv7 <80cf41b34d377d21d406fcb6835fbf77> /System/Library/PrivateFrameworks/DAVKit.framework/DAVKit 0x321d4000 - 0x322d5fff libicucore.A.dylib armv7 <1081389fef915d9b8858d0dfff04568e> /usr/lib/libicucore.A.dylib 0x322d6000 - 0x322d9fff ActorKit armv7 <c81b8278a35c6e8293aaf7c55811ba2d> /System/Library/PrivateFrameworks/ActorKit.framework/ActorKit 0x322da000 - 0x32388fff DataAccess armv7 <e9225a8b94fe76047095ebecd6fd58c5> /System/Library/PrivateFrameworks/DataAccess.framework/DataAccess 0x32389000 - 0x32390fff libbz2.1.0.dylib armv7 <6675987a84fc3d127305c175085914aa> /usr/lib/libbz2.1.0.dylib 0x323fc000 - 0x32499fff libobjc.A.dylib armv7 <1a57ecb9f5c0f274a274b3eb53df48ed> /usr/lib/libobjc.A.dylib 0x324b5000 - 0x324cbfff AddressBook armv7 <c21d7ab21d7e67f84c487bc278568bbe> /System/Library/Frameworks/AddressBook.framework/AddressBook 0x324d6000 - 0x32510fff CoreTelephony armv7 <5b68ed8ffac45237acc948e9d5bb5e83> /System/Library/PrivateFrameworks/CoreTelephony.framework/CoreTelephony 0x32511000 - 0x325bbfff CoreFoundation armv7 <51c03f1f8755868781e3e719d8df7b6f> /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation 0x325ca000 - 0x3268bfff MusicLibrary armv7 <ce4922bef1cc1d6706da32480c2272bd> /System/Library/PrivateFrameworks/MusicLibrary.framework/MusicLibrary 0x3268c000 - 0x3268efff AppleJPEG armv7 <af51b716dce446178b366a8d5af48ebb> /System/Library/PrivateFrameworks/AppleJPEG.framework/AppleJPEG 0x3268f000 - 0x326adfff MobileSync armv7 <1eecaede37e5d042180473311efccda3> /System/Library/PrivateFrameworks/MobileSync.framework/MobileSync 0x32860000 - 0x3286bfff PersistentConnection armv7 <73c2bec8b5f870ea528f359c2374f19c> /System/Library/PrivateFrameworks/PersistentConnection.framework/PersistentConnection 0x3286c000 - 0x328f2fff ImageIO armv7 <ea76d0fd3ca8c1a6104bc0f013255e2d> /System/Library/PrivateFrameworks/ImageIO.framework/ImageIO 0x3290f000 - 0x32918fff GraphicsServices armv7 <5387c7197570ac7df97759c0402d453d> /System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices 0x32933000 - 0x3299bfff PhotoLibrary armv7 <0535fc553452b7b6cc25ac990cff4a40> /System/Library/PrivateFrameworks/PhotoLibrary.framework/PhotoLibrary 0x3299f000 - 0x329ccfff Calendar armv7 <52446b9087d707210cb515b0894afee5> /System/Library/PrivateFrameworks/Calendar.framework/Calendar 0x329d6000 - 0x329fffff TextInput armv7 <2e983bf3876bfeaf7151aa8a0e68dabc> /System/Library/PrivateFrameworks/TextInput.framework/TextInput 0x32a01000 - 0x32a02fff CoreSurface armv7 <f3aae0195e4510657029b19161138593> /System/Library/PrivateFrameworks/CoreSurface.framework/CoreSurface 0x32a09000 - 0x32a0bfff Camera armv7 <81c49c0f094225be8a6ad129a8641c86> /System/Library/PrivateFrameworks/Camera.framework/Camera 0x32a56000 - 0x32a7efff libvDSP.dylib armv7 <d846b621ce13b16241ac2d32ddd28615> /System/Library/PrivateFrameworks/Accelerate.framework/Frameworks/vecLib.framework/libvDSP.dylib 0x32a81000 - 0x32a86fff liblockdown.dylib armv7 <5b665cd59d9884ceecec6441fc42bc14> /usr/lib/liblockdown.dylib 0x32a8a000 - 0x32a96fff DataAccessExpress armv7 <ad1aeb0c6df9b0b917c1c99405e36cc4> /System/Library/PrivateFrameworks/DataAccessExpress.framework/DataAccessExpress 0x32ab5000 - 0x32ac3fff TelephonyUI armv7 <b34206a34dfb1cc4183274cc6c0a3f36> /System/Library/PrivateFrameworks/TelephonyUI.framework/TelephonyUI 0x32ac4000 - 0x32ae5fff MobileQuickLook armv7 <06cb03b3f1bd2c5bfa27ba2aef0849b2> /System/Library/PrivateFrameworks/MobileQuickLook.framework/MobileQuickLook 0x32aed000 - 0x32b07fff libRIP.A.dylib armv7 <0dc4e83b63c1350517949e24204817fb> /System/Library/Frameworks/CoreGraphics.framework/Resources/libRIP.A.dylib 0x32b09000 - 0x32b2dfff Security armv7 <3a3406fe12445942f4d767c7fa4c24ce> /System/Library/Frameworks/Security.framework/Security 0x32b2e000 - 0x32b5bfff VideoToolbox armv7 <08b68b92f987faff46a127f6f78708a0> /System/Library/PrivateFrameworks/VideoToolbox.framework/VideoToolbox 0x32b60000 - 0x33524fff UIKit armv7 <47c9d61f9cbe72938d1bfb1588306b97> /System/Library/Frameworks/UIKit.framework/UIKit 0x3354f000 - 0x33580fff CoreMedia armv7 <584770f5de9c599a2d420eb8666921ac> /System/Library/PrivateFrameworks/CoreMedia.framework/CoreMedia 0x33586000 - 0x33588fff ArtworkCache armv7 <66057eb40ba62cb544fe00ac4f2b498e> /System/Library/PrivateFrameworks/ArtworkCache.framework/ArtworkCache 0x33594000 - 0x33599fff MBX2D armv7 <ae091892e4419221d25f8db9307cedf0> /System/Library/PrivateFrameworks/MBX2D.framework/MBX2D 0x3359a000 - 0x335d7fff CoreAudio armv7 <1eb427066a911d979a024e445464a067> /System/Library/Frameworks/CoreAudio.framework/CoreAudio 0x335d8000 - 0x33621fff libstdc++.6.dylib armv7 <99401ed10ec4d5608ce23ec33dd757c6> /usr/lib/libstdc++.6.dylib 0x33627000 - 0x33632fff libbsm.0.dylib armv7 <03f3879bad1802636dadeb457ee74cb2> /usr/lib/libbsm.0.dylib

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  • Do you think that exposure to BASIC can mutilate your mind? [closed]

    - by bigown
    It is practically impossible to teach good programming to students that have had a prior exposure to BASIC: as potential programmers they are mentally mutilated beyond hope of regeneration -- Edsger W. Dijkstra I have deep respect to Dijkstra but I don't agree with everything he said/wrote. I disagree specially with this quote on linked paper wrote 35 years ago about the Dartmouth BASIC implementation. Many of my coworkers or friends programmers started with BASIC, questions below have answers that indicate many programmers had their first experience on programming at BASIC. AFAIK many good programmers started at BASIC programming. I'm not talking about Visual Basic or other "modern" dialects of BASIC running on machines full of resources. I'm talking about old times BASIC running on "toy" computer, that the programmer had to worry about saving small numbers that need not be calculated as a string to save a measly byte because the computer had only a few hundreds of them, or have to use computed goto for lack of a more powerful feature, and many other things which require the programmer to think much before doing something and forcing the programmer to be creative. If you had experience with old time BASIC on a machine with limited resources (have in mind that a simple micro-controller today has much more resources than a computer in 1975, do you think that BASIC help your mind to find better solutions, to think like an engineer or BASIC drag you to dark side of programming and mutilated you mentally? Is good to learn a programming language running on a computer full of resources where the novice programmer can do all wrong and the program runs without big problems? Or is it better to learn where the programmer can't go wrong? What can you say about the BASIC have helped you to be a better/worse programmer? Would you teach old BASIC running on a 2KB (virtual) machine to a coming programmer? Sure, only exposure to BASIC is bad. Maybe you share my opinion that modern BASIC doesn't help too much because modern BASIC, as long other programming languages, gives facilities which allow the programmer doesn't think deeper. Additional information: Why BASIC?

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  • Extending Programming Languages

    - by chpwn
    (Since I just posted this in another question, but my browser had to be annoying and submit it without content first, here it is again:) I'm a fan of clean code. I like my languages to be able to express what I'm trying to do, but I like the syntax to mirror that too. For example, I work on a lot of programs in Objective-C for jailbroken iPhones, which patch other code using the method_setImplementation() function of the runtime. Or, in pyobjc, I have to use the syntax UIView.initWithFrame_(), which is also pretty awful and unreadable with the way the method names are structured. In both cases, the language does not support this in syntax. I've found three basic ways that this is done: Insane macros. Take a look at this "CaptainHook", it does what I'm looking for in a usable way, but it isn't quite clean and is a major hack. There's also "Logos", which implements a very nice syntax, but is written in Perl parsing my code with a ton of regular expressions. This scares me. I like the idea of adding a %hook ClassName, but not by using regular expressions to parse C or Objective-C. Finally, there is Cycript. This is an extension to JavaScript which interfaces with the Objective-C runtime and allows you to use Objective-C style code in your JavaScript, and inject that into other processes. This is likely the cleanest as it actually uses a parser for the JavaScript, but I'm not a huge fan of that language in general. Basically, this is a two part question. Should, and how should, I create an extension to Python and Objective-C to allow me to do this? Is it worth writing a parser for my language to transform the syntax into something nicer, if it is only in a very specialized niche like this? Should I just live with the horrible syntax of the default Objective-C hooking or pyobjc?

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  • How to escape % in roxygen literate programming?

    - by Karsten W.
    The default value of a parameter of my function contains a "%". This seems to be a problem for roxygen, it produces a lot of warnings and R CMD check fails when trying to build latex documentation. How can I make this function (and its documentation) work? Using %% or \% instead of % does not help. #' Test escape \% from in-source documentation (roxygen). #' #' What happens when parameters contain special latex characters? #' #' @param x unsuspicious parameter #' @param format sprintf format string (default "\%5.0f") #' #' @return formatted string #' @export #' @author Karsten Weinert testroxy <- function(x, format = "%5.0f") { sprintf(format,x) }

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  • Please give the solution of the following programs in R Programming

    - by NEETHU
    Table below gives data concerning the performance of 28 national football league teams in 1976.It is suspected that the no. of yards gained rushing by opponents(x8) has an effect on the no. of games won by a team(y) (a)Fit a simple linear regression model relating games won by y to yards gained rushing by opponents x8. (b)Construct the analysis of variance table and test for significance of regression. (c)Find a 95% CI on the slope. (d)What percent of the total variability in y is explained by this model. (e)Find a 95% CI on the mean number of games won in opponents yards rushing is limited to 2000 yards. Team y x8 1 10 2205 2 11 2096 3 11 1847 4 13 1803 5 10 1457 6 11 1848 7 10 1564 8 11 1821 9 4 2577 10 2 2476 11 7 1984 12 10 1917 13 9 1761 14 9 1709 15 6 1901 16 5 2288 17 5 2072 18 5 2861 19 6 2411 20 4 2289 21 3 2203 22 3 2592 23 4 2053 24 10 1979 25 6 2048 26 8 1786 27 2 2876 28 0 2560 Suppose we would like to use the model developed in problem 1 to predict the no. of games a team will win if it can limit opponents yards rushing to 1800 yards. Find a point estimate of the no. of games won when x8=1800.Find a 905 prediction interval on the no. of games won. The purity of Oxygen produced by a fractionation process is thought to be percentage of Hydrocarbon in the main condenser of the processing unit .20 samples are shown below. Purity(%) Hydrocarbon(%) 86.91 1.02 89.85 1.11 90.28 1.43 86.34 1.11 92.58 1.01 87.33 0.95 86.29 1.11 91.86 0.87 95.61 1.43 89.86 1.02 96.73 1.46 99.42 1.55 98.66 1.55 96.07 1.55 93.65 1.4 87.31 1.15 95 1.01 96.85 0.99 85.2 0.95 90.56 0.98 (a)Fit a simple linear regression model to the data. (b)Test the hypothesis H0:ß=0 (c)Calculate R2 . (d)Find a 95% CI on the slope. (e)Find a 95% CI on the mean purity and the Hydrocarbon % is 1. Consider the Oxygen plant data in Problem3 and assume that purity and Hydrocarbon percentage are jointly normally distributed r.vs (a)What is the correlation between Oxygen purity and Hydrocarbon% (b)Test the hypothesis that ?=0. (c)Construct a 95% CI for ?.

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  • c# Network Programming - HTTPWebRequest Scraping

    - by masterguru
    Hi, I am building a web scraping application. It should scrape a complex web site with concurrent HttpWebRequests from a single host to a single target web server. The application should run on Windows server 2008. One single HttpWebRequest for data could take from 1 minute to 4 minutes to complete (because of long running db operations) I should have at least 100 parallel requests to the target web server, but i have noticed that when i use more then 2-3 long-running requests i have big performance issues (request timeouts/hanging). How many concurrent requests can i have in this scenario from a single host to a single target web server? can i use Thread Pools in the application to run parallel HttpWebRequests to the server? will i have any issues with the default outbound HTTP connection/requests limits? what about Request timeouts when i reach outbound connection limits? what would be the best setup for my scenario? Any help would be appreciated. Thanks

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  • Programming language shootout: code most like pseudocode for Dijkstra's Algorithm

    - by Casebash
    Okay, so this question here asked which language is most like executable pseudocode, so why not find out by actually writing some code! Here we have a competition where I will award a 100 point bounty (I know its not much, but I am poor after the recalc) to the code which most resembles this pseudocode. I've read through this a few times so I'm pretty sure that this pseudocode below is correct and about as unambiguous as pseudocode can be. Personally, I'm going to have a go in Python and probably Haskell as well, but I'm just learning the later so my attempt will probably be pretty poor. Note: Obviously to implement anything looking like this you'll have to define quite a few library functions. define DirectedGraph G with: Vertices as V, Edges as E define Vertex A, Z declare each e in E as having properties: Boolean fixed with: initial=false Real minSoFar with: initial=0 for A else infinity define PriorityQueue pq with: objects=V initial=A priority v=v.minSoFar create triggers for v in V: when v.minSoFar event reduced then pq.addOrUpdate v when v.fixed event becomesTrue then pq.remove v Repeat until Z.fixed==True: define Vertex U=pq.pop() U.fixed=True for Edge E adjacentTo U with other Vertex V: V.minSoFar=U.minSoFar+length(E) if reducesValue return Z.name, Z.minSoFar

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  • C#.NET Socket Programming: Connecting to remote computers.

    - by Gio Borje
    I have a typical server in my end and a friend using a client to connect to my IP/Port and he consistently receives the exception: "A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond {MY_IP}:{MY_PORT}"—You don't need to know my IP. The client and server, however, work fine on the loopback address (127.0.0.1). I also do not have any firewall nor is windows firewall active. Server: static void Main(string[] args) { Console.Title = "Socket Server"; Console.WriteLine("Listening for messages..."); Socket serverSock = new Socket( AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPAddress serverIP = IPAddress.Any; IPEndPoint serverEP = new IPEndPoint(serverIP, 33367); SocketPermission perm = new SocketPermission(NetworkAccess.Accept, TransportType.Tcp, "98.112.235.18", 33367); serverSock.Bind(serverEP); serverSock.Listen(10); while (true) { Socket connection = serverSock.Accept(); Byte[] serverBuffer = new Byte[8]; String message = String.Empty; while (connection.Available > 0) { int bytes = connection.Receive( serverBuffer, serverBuffer.Length, 0); message += Encoding.UTF8.GetString( serverBuffer, 0, bytes); } Console.WriteLine(message); connection.Close(); } } Client: static void Main(string[] args) { // Design the client a bit Console.Title = "Socket Client"; Console.Write("Enter the IP of the server: "); IPAddress clientIP = IPAddress.Parse(Console.ReadLine()); String message = String.Empty; while (true) { Console.Write("Enter the message to send: "); // The messsage to send message = Console.ReadLine(); IPEndPoint clientEP = new IPEndPoint(clientIP, 33367); // Setup the socket Socket clientSock = new Socket( AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); // Attempt to establish a connection to the server Console.Write("Establishing connection to the server... "); try { clientSock.Connect(clientEP); // Send the message clientSock.Send(Encoding.UTF8.GetBytes(message)); clientSock.Shutdown(SocketShutdown.Both); clientSock.Close(); Console.Write("Message sent successfully.\n\n"); } catch (Exception ex) { Console.WriteLine(ex.Message); } } }

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  • Are there some general Network programming best practices?

    - by uriDium
    I am implementing some networking stuff in our project. It has been decided that the communication is very important and we want to do it synchronously. So the client sends something the server acknowledges. Are there some general best practices for the interaction between the client and the server. For instance if there isn't an answer from the server should the client automatically retry? Should there be a timeout period before it retries? What happens if the acknowledgement fails? At what point do we break the connection and reconnect? Is there some material? I have done searches but nothing is really coming up. I am looking for best practices in general. I am implementing this in c# (probably with sockets) so if there is anything .Net specific then please let me know too.

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  • Ruby Programming Techniques: simple yet not so simple object manipulation

    - by Shyam
    Hi, I want to create an object, let's say a Pie. class Pie def initialize(name, flavor) @name = name @flavor = flavor end end But a Pie can be divided in 8 pieces, a half or just a whole Pie. For the sake of argument, I would like to know how I could give each Pie object a price per 1/8, 1/4 or per whole. I could do this by doing: class Pie def initialize(name, flavor, price_all, price_half, price_piece) @name = name @flavor = flavor @price_all = price_all @price_half = price_half @price_piece = price_piece end end But now, if I would create fifteen Pie objects, and I would take out randomly some pieces somewhere by using a method such as getPieceOfPie(pie_name) How would I be able to generate the value of all the available pies that are whole and the remaining pieces? Eventually using a method such as: myCurrentInventoryHas(pie_name) # output: 2 whole strawberry pies and 7 pieces. I know, I am a Ruby nuby. Thank you for your answers, comments and help!

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  • Need help with dynamic programming problem

    - by John Retallack
    I have the following problem : I am given a tree with N apples, for each apple I am given it's weight and height,I can pick apples up to a given height H,each time I pick an apple the height of every apple is increased with U(also given).I have to find out the maximum weight of apples I can pick. e.g: N=4 H=100 U=10 (height-eight) apple1: 91 10 apple2: 82 30 apple3: 93 5 apple4: 94 15 The answer is 45 : I first pick the apple with the weight of 15 then the one with the weight of 30. I would like to know if someone here could help me with giving me an hint on how I should approach this problem. Thank you.

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  • programming logic and design pleas friends i need a flowcharts or pseudocode

    - by alex
    ***the midvile park maintains records containing info about players on it's soccer teams . each record contain a players first name,last name,and team number . the team are team number team name 1 goal getters 2 the force 3 top gun 4 shooting stars 5 midfield monsters design a proggram that accept player data and creates a report that lists each** player a long with his or her team number and team name**

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  • Archery game programming algorithm

    - by Ricky
    I need the algorithm to animate the arrow based on 2 parameters, angle while shooting and power while drawing the bow. Ive tried to use y=asinx but it works only when shooting in up direction. Doesnt work well while shooting with straight or down direction. Thanks.

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  • DRY programming dilemma

    - by fayer
    the situation is like this: im creating a Logger class that can write to a file but the write_to_file() function is in a helper class as a static function. i could call that function but then the Log class would be dependent to the helper class. isn't dependency bad? but if i can let it use a helper function then what is the point of having helper functions? what should one prioritize here: using helper functions and have to include this helper class everywhere (but the other 99 methods wont be useful) or just copy and paste into the Log class (but then if i have done this 100 times and then make a change i have to change in 100 places). share your thoughts and experience!

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  • Initial Genetic Programming Parameters

    - by cmptrer
    I did a little GP (note:very little) work in college and have been playing around with it recently. My question is in regards to the intial run settings (population size, number of generations, min/max depth of trees, min/max depth of initial trees, percentages to use for different reproduction operations, etc.). What is the normal practice for setting these parameters? What papers/sites do people use as a good guide?

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  • Gotchas In Programming Languages.

    - by Draco Ater
    There is a collection of "very special irregularities, inconstancies and just plain painfully unintuitive moments" concerning javascript on wtfjs. Do you know some other collections of such unintuitive moments for other languages?

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  • Genetic Programming Online Learning

    - by Lirik
    Has anybody seen a GP implemented with online learning rather than the standard offline learning? I've done some stuff with genetic programs and I simply can't figure out what would be a good way to make the learning process online. Please let me know if you have any ideas, seen any implementations, or have any references that I can look at.

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  • Practical Scheme Programming

    - by Ixmatus
    It's been a few months since I've touched Scheme and decided to implement a command line income partitioner using Scheme. My initial implementation used plain recursion over the continuation, but I figured a continuation would be more appropriate to this type of program. I would appreciate it if anyone (more skilled with Scheme than I) could take a look at this and suggest improvements. I'm that the multiple (display... lines is an ideal opportunity to use a macro as well (I just haven't gotten to macros yet). (define (ab-income) (call/cc (lambda (cc) (let ((out (display "Income: ")) (income (string->number (read-line)))) (cond ((<= income 600) (display (format "Please enter an amount greater than $600.00~n~n")) (cc (ab-income))) (else (let ((bills (* (/ 30 100) income)) (taxes (* (/ 20 100) income)) (savings (* (/ 10 100) income)) (checking (* (/ 40 100) income))) (display (format "~nDeduct for bills:---------------------- $~a~n" (real->decimal-string bills 2))) (display (format "Deduct for taxes:---------------------- $~a~n" (real->decimal-string taxes 2))) (display (format "Deduct for savings:-------------------- $~a~n" (real->decimal-string savings 2))) (display (format "Remainder for checking:---------------- $~a~n" (real->decimal-string checking 2)))))))))) Invoking (ab-income) asks for input and if anything below 600 is provided it (from my understanding) returns (ab-income) at the current-continuation. My first implementation (as I said earlier) used plain-jane recursion. It wasn't bad at all either but I figured every return call to (ab-income) if the value was below 600 kept expanding the function. (please correct me if that apprehension is incorrect!)

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