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• How does enterprise failover, such as with google.com, actually work?

  - by Alex Regan

  We have a few fedora systems that are configured for web, FTP, and email services. We'd like to mirror these services, so that we can provide near 100% reliability for our users. I'm a fairly experienced Linux administrator, but don't have much experience with redundant systems. What is the best way to do this? How does google and amazon do it? Google.com resolves to multiple IP addresses, but if my local desktop caches one of the IPs that are unreachable, I'm going to get a failed connection message. How do they prevent that from happening? If one of their servers goes down, how is it automatically redirected to another system, without the end-user ever knowing it? I understand there are failover devices, but they're only for failing over the system itself, not a complete network. Let's say we have the worst-case scenario, such as my primary system becomes inaccessible. What are the fundamental components that are used on Linux systems to provide this capability? I'm looking for concepts, or approaches, not answers like "check out openstack". What are the actual pieces that make up the solution? What has to be done to implement this capability? Hopefully my question is clear. I'd like to know what the pieces are that make up a failover system and what approach is taken by successful organizations that implement it. Thanks again, Alex

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• Does WebDAV even work on IIS 7? I say nay

  - by FlavorScape

  I've tried every configuration from the top 10 stack overflow and server fault results for WebDAV 405 on IIS (for verb PROPFIND and PUT). I'm running server 2008 SP2. Followed all the instructions here. I'm no stranger to configuring servers. This has gotten nowhere after 8 hours. Confirmed system.webserver in applicationhost.config: <add name="WebDAV" path="*" verb="PROPFIND,PROPPATCH,MKCOL,PUT,COPY,DELETE,MOVE,LOCK,UNLOCK" modules="WebDAVModule" resourceType="Unspecified" requireAccess="None" /> Port 443 with basic auth, same issue. Tried port 80 with windows auth. Broken. (405) Windows authentication. Check. Added authoring rules for default site and application. Check. Not the firewall. Check. added "Desktop Experience" role feature Tried HTTPS with Basic Authentication on port 443. Does not work. No other services are running like Sharepoint. Check. confirmed user has read/write NT level permissions for the folder/virtual dir tried net use * http://localhost /user:MYDOMAIN\me myPass get error 1920, if I don't authenticate I get error 67 confirmed I'm not applying filtering to WebDAV: <requestFiltering> <fileExtensions applyToWebDAV="false" /> <verbs applyToWebDAV="false" /> <hiddenSegments applyToWebDAV="false" /> 405 - HTTP verb used to access this page is not allowed. The page you are looking for cannot be displayed because an invalid method (HTTP verb) was used to attempt access. SHOULD I JUST GIVE UP? Other questions that helped none: 405 - ‘Method not Allowed’ adding service hosted in IIS7 webdav on iis7.5 - simply cannot make it work http://studentguru.gr/b/kingherc/archive/2009/11/21/webdav-for-iis-7-on-windows-server-2008-r2.aspx

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• Lighttpd - byte range request doesn't work. can't stream mp4

  - by w-01

  Am attempting to use the lastest flowplayer. (if it could work it would be pretty awesome btw) http://flowplayer.org One of the cool things about it is it uses the new HTML5 video element and supports random seeking/playback. In order to do this, you need a byte range request capable server on the backend. Luckily I'm using Lighttpd 1.5.0 on the backend. Unfortunately the current behavior is that when I do a random seek, the video simply restarts itself from the beginning. the docs say: "For HTML5 video you don't have to do any client side configuration. If your server supports byte range requests then seeking should work on the fly. Most servers including Apache, Nginx and Lighttpd support this." On my page, using chrome web developer tools, i can see when the video is requested, the server response headers indicate it is able to acce[t byte ranges. Accept-Ranges:bytes when I do random seek in the player, I can see that that byte ranges are request appropriately in the request header: Range: bytes=5668-10785 I can also verify the moov atom is at the front of the video file. My question here is if there is something else on the lighttpd side i'm missing in order to enable byte-range requests? The reason i ask is because the current behavior suggests that the lighttpd simply doesn't understand the byte range request and is just reserving the video from the beginning. Update it's clearer to put this here. As per RJS' suggestion I ran a curl command. in the response it looks like lighttpd is working as expected. Content-Range: bytes 1602355-18844965/18844966 Content-Length: 17242611

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• Why won't 2GB of ram across 3 of 4 slots work on my motherboard (max 2GB)?

  - by Andrew

  My desktop is an old home-built machine circa 200[5-6] running Ubuntu 11.10 (but this is not relevant because I'm reading available ram from BIOS loading screen), with an ASUS P5GPL motherboard, not X or X-SE - it has four slots. I'm mainly a laptop person, but keep this around for running a server from if needed, backing up to, seeding Ubuntu to people from, etc… It has four (DDR) ram slots, two black and two blue, in the order black-blue-black-blue (I will call them D, C, B, and A, respectively) with some space in the middle. The blue ones are the closest to the processor. I used to have two 512MB chips in the two blue slots. I just got a 1GB chip and plugged it into one of the black slots; my system didn't recognize it. I messed around and discovered that it will not recognize chips in many positions, and I couldn't get it to recognize all three of these chips at the same time. In particular, if I put the 512MB chips in A and B it would only use 1, but AC, AD, BD, and CD worked. I didn't try BC, I believe. Only some of these continue to work when I switch the 1GB chip into one of these positions. Can I have some advice as to how to position these chips to get all 2GB used? How about if I get another 1GB chip - where should I put the two? And what about the RAM maximum Crucial says? Can I go above 2GB, if I get another 1GB chip? Right now, I have a 512MB chip in A and the 1GB chip in C. EDIT: I read some other posts and tried dmidecode in Ubuntu to clarify the max memory question, that wasn't a major part anyways. It says my max memory module size is 1024M (OK) and my max memory size is 4096M (doesn't agree with Crucial OR the Asus web site, maybe it will only work while in Linux and BIOS won't OK it?).

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• How does IPv6 subnetting work and how does it differ from IPv4 subnetting?

  - by Michael Hampton

  This is a Canonical Question about IPv6 Subnetting. Related: How does IPv4 Subnetting Work? I know a lot about IPv4 Subnetting, and as I prepare to (deploy|work on) an IPv6 network I need to know how much of this knowledge is transferable and what I still need to learn. IPv6 seems at first glance to be much more complex than IPv4. So I would like to know: IPv6 is 128 bits, so why is /64 the smallest recommended subnet for hosts? Related to this: Why is it recommended to use /127 for point to point links between routers, and why was it recommended against in the past? Should I change existing router links to use /127? Why would virtual machines be provisioned with subnets smaller than /64? Are there other situations in which I would use a subnet smaller than /64? Can I map directly from IPv4 subnets to IPv6 subnets? My interfaces have several IPv6 addresses. Must the subnet be the same for all of them? Why do I sometimes see a % rather than a / in an IPv6 address and what does it mean? Am I wasting too many subnets? Aren't we just going to run out again? In what other major ways is IPv6 subnetting different from IPv4 subnetting?

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• Windows 7 just deleted 4 days of work wtf!?

  - by Mat

  Hey! I'm just a bit about to freak out. I just finished a project and rebooted my computer. It didn't want to boot anymore so I had to use the windows 7 system repair option. it run for a minute and then booted up. Now most of my sourcecode from the last 4 days of work is gone! background: sometimes (most often after installing new software) my notebook won't boot up anymore. It will just show the little Win 7 flag, but not read from the harddisk anymore. If I hardabord and reboot then, it asks me whether to start windows normally (which won't work) or to run "windows startup repair". If i run it, it does some stuff for about two or three minutes and then I can boot windows again. Usually after this, .exe files i added to the computer during previous days are gone - but other files so far were not touched. But now, after this happened, a whole bunch of ".as" (ActionScript source files) from my project are gone!! does anyone know where and whether there's a way to recover them?? please help! Thank you!

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• Ubuntu: how to get audio to work in both Spotify (under Wine) and Flash (in Firefox)?

  - by Jonik

  I'm running Spotify on Linux using Wine. Sound worked great (even though the sound test in winecfg failed!), until I installed alsa-oss package yesterday to get Flash sound working in Firefox. Now Spotify says: "There is a problem with your sound card. Spotify can't play music." So the question is, how to get the sound in Spotify working again, so that it also keeps working in Flash & Firefox? Tweak some ALSA settings? Spotify settings? Add/remove some packages? By the way, curiously, now that sound doesn't work in Spotify, winecfg's "Test Sound" does work! This is Ubuntu 8.04 (Hardy). Sound card / driver is probably an integrated AC'97. Please mention if any additional information about the system is needed! Update: I have Flash 10 installed (outside the packaging system, using $MOZ_PLUGIN_PATH env variable), but also had Flash 9 from flashplugin-nonfree package - and the earlier version was being used by Firefox! Based on what Mike Arthur said about Flash and alsa-oss, I removed the older Flash (flashplugin-nonfree package) and alsa-oss - and Flash sound still works, which is nice. But for some reason Spotify still doesn't play sound, even though things should now be like they were originally... Update 2: Got it working, all smoothly, finally.

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• Some HTTPS connections via NAT fail, but work on firewall itself.

  - by hnxn

  Hi, I am having trouble establishing some HTTPS connections from internal machines, even though these same connections work if initiated on the firewall itself. The firewall machine is running Ubuntu 10.04.1 and shorewall 4.4.6. The internet connection is Bell PPPoE DSL (in Canada). I have tried various MTU settings, it doesn't seem to make any difference. Other protocols (HTTP, FTP, etc) generally work. The problem seems to be limited to certain sites; this one never works from an internal machine, but always works from the firewall itself: From internal machine: $ wget https://images.fedex.com/images/ascend/shared/headers/nxgen/corp_logo.gif --2011-01-13 20:51:31-- https://images.fedex.com/images/ascend/shared/headers/nxgen/corp_logo.gif Resolving images.fedex.com... 184.24.96.69 Connecting to images.fedex.com|184.24.96.69|:443... connected. ^C From firewall: $ wget https://images.fedex.com/images/ascend/shared/headers/nxgen/corp_logo.gif --2011-01-13 20:58:28-- https://images.fedex.com/images/ascend/shared/headers/nxgen/corp_logo.gif Resolving images.fedex.com... 184.24.96.69 Connecting to images.fedex.com|184.24.96.69|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 840 [image/gif] Saving to: `corp_logo.gif' 2011-01-13 20:58:28 (149 MB/s) - `corp_logo.gif' saved [840/840] This URL always works from both internal and firewall: https://encrypted.google.com/images/logos/ssl_logo_lg.gif Any troubleshooting tips would be greatly appreciated!

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• Is it possible to change an "Unidentified Network" into a "Home" or "Work" network on Windows 7

  - by Rhys

  I have a problem with Windows 7 RC (7100). I frequently use a crossover network cable on WinXP with static IP addresses to connect to various industrial devices (e.g. robots, pumps, valves or even other Windows PCs) that have Ethernet network ports. When I do this on Windows 7, the network connection is classed as an "Unidentified Network" in Networks and Sharing Center and the public firewall profile is enforced by Windows. I do not want to change the public profile and would prefer to use the Home or Work profile instead. For other networks like Home and Work I'm able to click on them and change the classification. This is not available for unidentified networks. My questions are these:- Is there a way to manual override the "Unidentified Network" classification? What tests are performed on the network that fail, therefore classifying it as an "Unidentified Network" By googling (hitting mainly vista issues) it seems that you need to ensure that the default gateway is not 0.0.0.0. I've done this. I've also tried to remove IPv6 but this does not seem possible on Windows 7.

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• Why do HTTP loopback connections not work on my subdomains?

  - by memeLab

  I have a shared hosting account at Jumba running Linux kernel 2.6.9-103.ELsmp (don't know if that helps) with cpanel 1.0 (RC1). I am using the WordPress plugin Backup Buddy, which requires HTTP loopback connections to monitor / complete backups. This works fine on memelab.com.au, but doesn't work at any subdomain (e.g.: staging.memelab.com.au). Is it possible to setup an A record or some such to remedy this? I'm aware of a workaround, (setting WP_ALTERNATE_CRON) but I find this unsatisfactory due to the messy URLs. BackupBuddy:_Frequent_Support_Issues#HTTP_Loopback_Connections_Disabled Here is the reply from my host: …as main domain have it's own separate DNS entry it have localhost entry which helps for looback connections where as subdomains don't have separate DNS zone, so it is not possible to create looback connections for it. I have cpanel access to the 'advanced zone editor' - is there anything tricky I can do there? maybe 127.0.0.2? (I remember reading that there were at least 8 available local IPs available on (some) Linuxes.) All the A records point to the server IP, with the exception of localhost.memelab.com.au which points to 127.0.0.1. I've just tried entering a new A record: localhost.itours.memelab.com.au pointing to 127.0.0.2. I still get the warning in Backup Buddy that loopback is not active, and Cpanel won't let me enter 127.0.0.1 (guess it doesn't work like that!) nslookup itours.memelab.com.au Server: 203.88.112.33 Address: 203.88.112.33#53 Non-authoritative answer: Name: itours.memelab.com.au Address: 117.55.224.177

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• GlassFish v2.1 -- getting Application Client and Eclipselink to work together?

  - by Nick

  We are trying to use Eclipselink 1.1 with Glassfish v2.1. Following the instructions on: http://wiki.glassfish.java.net/Wiki.jsp?page=FaqEclipseLinkGlassFishV2 I adapted the instructions for the appclient script on linux by adding the lines: APPCPATH=$APPCPATH:$AS_INSTALL/lib/eclipselink-1.1.1.jar export APPCPATH to the appclient shell script. This however is not working. On running the application client (using Glassfish's webstart), I get the error: WARNING: "IOP00810257: (MARSHAL) Could not load class org.eclipse.persistence.indirection.IndirectList" Anyone else succeed in getting GF v 2.1 to work with eclipselink? or any ideas on what I might be doing wrong? I found this bug report: http s://glassfish.dev.java.net/issues/show_bug.cgi?id=8204 (New users can't post more than 1 link, so remove the space between 'http' and 's'.) Where Tim Quinn (tjquinn) said: App client container support for persistence is not yet in place I think this refers only to Glassfish v3, and it should be working in Glassfish v2. Is this correct? I'm working on the assumption that this will work once the ACC knows where to find the eclipselinks jar. Thanks in advance, Nick.

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• While using an ntfs smb share for mac users, do symbolic links and extended attributes work?

  - by scape

  We have a majority of mac users but we'd rather support their file sharing using a Windows server with an ntfs drive, or at least a Linux server with ext3. We've had trouble, much trouble, utilizing the OS X server software and after the years are now looking to abandon it. What's mostly holding us back is the fact that the mac users very often utilize symbolic links and other special features that exist for an HFS+ partition. The shared locations are mostly primary storage and not just used as an archive storage location. While there is an option to create symbolic links under ntfs, I'm curious if there is anything I need to look out for if I were to move the files over to a new partition that's hosted from a Windows server from the HFS+ partition; in addition, how well creating a symbolic link from a mac might work. I am also worried about windows backup software and if it will ruin these special sym links, and how placing permissions on sub-folders will work. Alternatively I could remotely backup the files using a mac and Bru, nonetheless I still want to get away from mac server for hosting the shares.

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• When modern computers boot, what initial setup of RAM do they execute, and how does it exactly work?

  - by user272840

  I know the title reeks of confusion, and some of you might assume I am just wondering about how the computer boots in general, but I'm not. But I'll sort this out for you people now: 1.Onboard firmware is how mostly all modern computer devices work, whether or not with EFI/UEFI(even without "onboard firmware", older computers still employed bank switching, or similar methods with snap-in firmware, cartridges, etc.) 2.On startup there is no "programs" running in the traditional sense yet, i.e. no kernel, OS, user-applications; all of the instructions, especially the very first instruction, is specified by the Instruction Pointer, I am guessing. How is the IP/PC/etc. set to first point to an address for a BIOS/firmware/etc. instruction, and how do the BIOS instructions map themself out in memory prior to startup? 3.Aside from MMIO, BIOS uses certain RAM addresses to have instructions. The big ? comes in when I ask this ... how does BIOS do this? Conclusion: I am assuming that with the very first instruction there is an initial hardware setup for BIOS prior to complete OS bootup. What I want to know is if it's hardware engineered to always work this way, if there's another step in this bootup method I am missing, a gap of information I am unaware of, or how this all works from the very first instruction, and the RAM data itself.

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• How can I get mouse capture to work in virtualbox when I move guest window to second monitor?

  - by Dan

  I'm running VirtualBox on a Win7 host. Guest OS is Centos. My setup is a laptop (screen 1) with a huge external monitor (screen 2). I'm only telling Centos there is one monitor though. When I start up VirtualBox on screen 1, the mouse capture works fine. I don't have mouse integration because (I think) the kernel on Centos is too old to support it. That's fine, I don't mind doing the Right-Control thing. The problem I have is that when I drag the whole VM window over to my second monitor, the mouse capture doesn't work right anymore. I click inside the VM and can move the VM cursor a little bit, but I can't always get to the edges of the VM screen -- before I get all the way to an edge, the cursor will escape from the VM as if I had hit right-control. But it's still captured according to the icon, and if I then hit right-control, the guest cursor jumps to a different screen location. My workaround: if I have the VM window mostly on screen 2, but a small corner of it still on screen 1, then the mouse capture works correctly. Is there a setting to make this work better?

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• Two network adapters in one WindowsXP PC, how to make them work?

  - by Deele

  I have a need to set up network so I can use two ethernet cards inside one Windows (Windows XP SP2) based PC, one for internet connection, second, for internal LAN. How should I configure each NIC, with what IP's, subnet masks and gateways, so I can use inernet on my PC and get in touch with devices on my LAN? I have found that there are some sort of re routing nessesary inside my PC, but how does it work? I have already set up some configuration already, but I can't use it together with PC #1 NIC #1 connected. I need to disconnect, to access NIC WEB interface. Current configuration: Switch #1 and PC #1 NAS #2 are gigabit one's, so I could access NAS with gigabit speed. PC #1 NIC #1 IP XX.XXX.162.106 SN 255.255.255.248 GW XX.XXX.162.105 PC #1 NIC #2 IP 10.0.0.1 SN 255.255.0.0 GW 0.0.0.0 NAS #1 NIC #1 IP 10.0.0.12 SN 255.255.0.0 GW 0.0.0.0 My question is - what exact configuration should I do for every NIC in this LAN, so it would work? Is it possible to achieve internet access for Laptop, that is inside that NIC #2 LAN (should I just set up basic ICS)?

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• How to make Microsoft JVM work on Windows 7?

  - by rics

  I am struggling with the following problem. I cannot install MS JVM 3810 properly on Windows 7. When I start Interner Explorer 8 without starting any java 1.1 programs choosing Java custom settings under Internet options causes the crash of the browser. I have some Java 1.1 programs that work well in Internet Explorer 8 on Windows XP after the installation of MS JVM 3810. I know that it is not advised to use this old JVM but it is not a short-term option to port the programs in newer Java since it contains 3rd party components. Complete rewrite is a long-term plan. Strangely jview and appletviewer (jview /a) works from a console so the MS JVM 3810 is not completely busted just IE 8 does not like it. The problem with the appletviewer is that it cannot connect to the server even if both signed and unsigned content in Java custom settings have been set to Enable all. (Since Java custom settings was unreachable due to the crash the modifications - including My computer - were performed through the registry and pre-checked to behave correctly on Windows XP and Internet Explorer 8.) If jview was working then I could at least think of a workaround. Is there a way to configure MS JVM or jview properly on Windows 7? Another options would be: Checking Internet Explorer 9 Beta. Using virtualbox and Windows XP older IE in it. Delaying Windows 7 upgrade. ... Update Finally we have modified all the programs to work parallelly as applet and application as well. This way the programs can still be used from browser on older Windows versions. On Windows 7 the applications are started from the desktop. Installation to all user machine can easily be solved since they already have a large common application drive. The code update is fortunately only a few lines of modification: including a main method in the applet class. Furthermore instead of the starting html page a bat file is used to set the classpath before the startup with jview.

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• Why don't the .net 4.0 charting controls work in Visual Web Developer 2010 Express?

  - by kc

  The .net charting controls are now built into .net 4.0. They work great in Visual Studio 2010. However, they do not work in Visual Web Developer 2010 Express (which is what I have at home.) I get the error, System.Web.HttpException: Error executing child request for ChartImg.axd. That sounds like the message from .net 3.5 if charting wasn't set up correctly. But the bottom of the same page says, "Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1" Does anyone know why this doesn't work?

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• To be effective on your home projects is it better using the same technologies used at work?

  - by systempuntoout

  To be more productive and effective, is it better to start developing an home project using the same technologies used at work? I'm not talking about a simple hello world web page but an home project with all bells and whistles that one day, maybe, you could sell on internet. This dilemma is often subject of flames between me and a friend. He thinks that if you want to make a great home-made project you need to use the same technologies used daily at work staying in the same scope too; for example, a c++ computer game programmer should develope an home-made c++ game. I'm pretty sure that developing using the same technologies used at work can be more productive at beginning, but surely less exciting and stimulating of working with other languages\ides\libraries out of your daily job. What's your opinion about that?

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• How does 64 bit code work on OS-X 10.5?

  - by philcolbourn

  I initially thought that 64 bit instructions would not work on OS-X 10.5. I wrote a little test program and compiled it with GCC -m64. I used long long for my 64 bit integers. The assembly instructions used look like they are 64 bit. eg. imultq and movq 8(%rbp),%rax. I seems to work. I am only using printf to display the 64 bit values using %lld. Is this the expected behaviour? Are there any gotcha's that would cause this to fail? Am I allowed to ask multiple questions in a question? Does this work on other OS's?

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• Is there an ftp plugin for gedit that will let me work locally?

  - by RobertWHurst

  I'm trying to switch from a windows environment to Linux. I'm primarily PHP developer, but I do know quite a bit about other languages such as CSS, XHTML and Javascript. I need a way of editing my files locally because I work in a git repository and need to commit my saves. On windows I used Aptana and PDT. I'd save my files, upload via Aptana, then commit my work with git. I need to get a work flow going on my Linux machine now. If you know a better way to do this let me know, however my real question is, is there a plugin that allows gedit to upload files instead of working remotely?

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• How to make software which will work like torrent?

  - by Nitz

  Hey guys How to make software work like torrent work? Bcz always when i see that torrent software then i am really amazed by their sizes and what they do in that sizes? How they managed the download by parts and then all together as soon as u downloaded full part? and as soon as you had great speed then your download speed automatically goes up? How to make software which will work like torrent means peer-to-peer? how to make this kind of software which can download from different servers and managed to know each users download and upload? and how they have pretty small size? which tech. they have used in that kind of software? Sorry i had asked many question. I know how downloading is happening means peer-to-peer all that.. but i don't know how they have built that kind of thing?

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• How can I get Syslogging to work on the JVM?

  - by Synesso

  I want to do syslogging from Java. There is a log4j appender, but it doesn't seem to work (for me anyway ... though Google results show many others with this issue still unresolved). I'm trying to debug the appender, so I've written the following script based upon RFC3164 It runs, but no logging appears in the syslog. // scala import java.io._ import java.net._ val ds = new DatagramSocket() val fullMsg = "<11>May 26 14:47:22 Hello World" val packet = new DatagramPacket(fullMsg.getBytes("UTF-8"), fullMsg.length, InetAddress.getLocalHost, 514) ds send packet ds.close I also tried using /bin/nc, but it doesn't work either. echo "<14>May 26 15:23:83 Hello world" > nc -u localhost 514 The Ubuntu command /usr/bin/logger does work, however. logger -p user.info hello world # logs: May 26 15:25:10 dsupport2 jem: hello world What could I be doing wrong?

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• Is it better to adopt the same technologies used at work to be effective on your home projects ?

  - by systempuntoout

  Is it better to start developing an home project using the same technologies used at work to be more productive and effective? I'm not talking about a simple hello world web page but an home project with all bells and whistles that one day, maybe, you could sell on internet. This dilemma is often subject of flames between me and a friend. He thinks that if you want to make a great home-made project you need to use the same technologies used daily at work staying in the same scope too; for example, a c++ computer game programmer should develope an home-made c++ game. I'm pretty sure that developing using the same technologies used at work can be more productive at beginning, but surely less exciting and stimulating of working with other languages\ides\libraries out of your daily job. What's your opinion about that?

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• I can't get the MapsDemo that comes with "Google APIs by Google Inc, Android API8, revision 2" to work

  - by Hanspeter Adam

  I have tried everything according to instructions to get the MapsDemo to work on API8. I followed all the certificate signing instructions and all I get is a blank (blue) screen on the emulator. I see that people have been having the same issues but all the suggested solutions boil down to the certificate signing and that has not worked for me. One guy on the Internet even said he got it to work but never said how!!!! So, I thought I'd try the MapsDemo that comes with "Google APIs by Google Inc, Android API7, revision 1". There I saw the map come up on the emulator but only once. That one time it came up clearly and I was able to pan it but after exiting the app and trying it again, it no longer worked. Now all I get is some faint outlines that makes it look like it's trying to work but for some reason is not successful. I am running on Windows Vista Service Pack 2 and using Eclipse Helios. Please help, Hans

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• R matrix handling expressions aren't evaluated in a function or a "for" loop - Column extract doesn't seem to work

  - by Sal Leggio

  I have an R matrix named ddd. When I enter this, everything works fine: i <- 1 shapiro.test(ddd[,y]) ad.test(ddd[,y]) stem(ddd[,y]) print(y) The calls to Shapiro Wilk, Anderson Darling, and stem all work, and extract the same column. If I put this code in a "for" loop, the calls to Shapiro Wilk, and Anderson Darling stop working, while the the stem & leaf call and the print call continue to work. for (y in 7:10) { shapiro.test(ddd[,y]) ad.test(ddd[,y]) stem(ddd[,y]) print(y) } The decimal point is 1 digit(s) to the right of the | 0 | 0 0 | 899999 1 | 0 [1] 7 The same thing happens if I try and write a function. SW & AD do not work. The other calls do. D <- function (y) { + shapiro.test(ddd[,y]) + ad.test(ddd[,y]) + stem(ddd[,y]) + print(y) } D(9) The decimal point is at the | 9 | 000 9 | 10 | 00000 [1] 9 Why don't all the calls behave the same way?

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