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  • What are the typical applications of Lisp macros?

    - by Giorgio
    I am trying to learn some LISP and I have read a lot about the importance of LISP macros so I would like to get some working experience with them. Can you suggest a practical application area that would allow me to use macros to solve a real-world problem, and to understand the usefulness of this programming construct? NOTE This is not a generic what project should I do next question. I am interested to understand which kinds of problems are typically solved by means of LISP macros. E.g., are they good for implementing abstract data types? Why was this construct added to the language? What kinds of problems does it solve that cannot be solved by means of simple functions?

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  • Mount an image created from ddrescue

    - by oshirowanen
    I know this question has been asked before, but following those answers does not seem to work for me. I have created an image of a USB stick this is on my laptop harddrive. How do I mount this image? The command I used to create the image was: ddrescue --no-split /dev/sdb usb_recovered usb_recovery_log What am I supposed to do next? Mount it? Fix it then mount it? Mount it then fix it? And how? UPDATE: What I want to recover are the files in the image. How? I don't know as I have tried testdisk and it can't find partitions, and I have tried fdisk and it can't find a partition table in the image either.

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  • Delete key assigned to a keyboard shortcut and now doesn't work

    - by Erez Schatz
    I posted this to the ubuntuforums, but got no answer there, so I'm trying here: While going over the keyboard shortcuts (System Preferences Keyboard Shortcuts), I accidentally assigned the delete key to a shortcut. I backspaced and cancelled, but next time I pressed "delete" the key didn't work. I tried creating a new shortcut called Delete and this got me a weird pop up saying "Error while trying to run (Delete) which is linked to the key (Delete)". I removed the shortcut, but it's still assigned. I deleted the custom shortcut, but to no avail. Any ideas? this drives me bonkers, as it's such a used key

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  • [News] Les 10 raisons qui font que HTML 5 n'est pas pr?t de remplacer Silverlight

    Alors qu'on entend de plus en plus de voix s'?lever pour le remplacement de Flash et Silverlight par la future sp?cification HTML 5, Bart Czernicki explique les 10 raisons qui font que cela n'est pas pr?t d'arriver : "HTML 5 is the next update to the HTML standard that powers the web. There are many new exciting features being added like the the canvas element, local offline storage, drag and drop and video playback support. HTML needed to evolve and added these features in order to stay relevant as the de facto markup language that can provide a rich web experience.". Une argumentation ?tay?e ? lire absolument.

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  • Collision Resolution

    - by CiscoIPPhone
    I know quite well how to check for collisions, but I don't know how to handle the collision in a good way. Simplified, if two objects collide I use some calculations to change the velocity direction. If I don't move the two objects they will still overlap and if the velocity is not big enough they will still collide after next update. This can cause objects to get stuck in each other. But what if I try to move the two objects so they do not overlap. This sounds like a good idea but I have realised that if there is more than two objects this becomes very complicated. What if I move the two objects and one of them collides with other objects so I have to move them too and they may collide with walls etc. I have a top down 2D game in mind but I don't think that has much to do with it. How are collisions usually handled? This question is asked on behalf of Wooh

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  • rc.local is not always executed upon boot

    - by starcorn
    Hey, I have some weird problem with the rc.local file which is located in /etc/rc.local the thing is that it is not always running when I boot up the laptop. Maybe every second time, I haven't counted. Anyway when that happens I have to manually go to terminal and type sudo /etc/init.d/rc.local start, which kinda kills the purpose of having this script. Anyone know what the problem could be? EDIT Since this wasn't obvious. This is an issue where I make a fresh boot up. Which mean I have shut down the computer. And next time when I boot up the computer, the rc.local file is randomly deciding whether it will automatically start or not. Here's a copy of what my rc.local file contains echo -n 255 > /sys/devices/platform/i8042/serio1/serio2/sensitivity echo level 2 > /proc/acpi/ibm/fan touch /home/starcorn/Desktop/foo rfkill block bluetooth exit 0

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  • Brightness issues on MSI GT683

    - by Mitu
    I'm experiencing brightness related issues on my MSI GT683 (Intel Core i5-2410M, nVidia GeForce GTX 560M, Ubuntu 12.04 LTS x64, nVidia driver version 295.40). To start with, when I open brightness settings, the slider is working incorrectly - screen is the dimmest on about 1/3 of a bar, moving it to the left side increases brightness. Next, while pressing the keyboard buttons (Fn+up, Fn+down), brightness changes incorrectly - sometimes 2 steps up/down, but sometimes it's totally irregular - ex. in order to set the lowest brightness, I have to set the maximum, then hit Fn+down, then Fn+up. (after 2 moves from 8 to 2... What's even more strange, while changing brightness from keyboard on boot and on login screen, it works perfect. Tried adding acpi related switches to GRUB, but the brightness settings wouldn't work at all. Any help appreciated.

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  • Installing windows after ubuntu is installed (need to create ntfs partition too)

    - by Brent Roose
    I prefer Ubuntu to work on, but for some applications for school, I need windows. I've done some research and have a few problems: I only have one hard drive which is formatted as ext4, not ntfs. Many people say I have to use Gparted to create an ntfs partition to install windows on, the only problem is that I need to unmount my drive to do this, which isn't possible I think because I only have one. I thought about mounting my HDD as a slave on a windows laptop but I don't manage to partition it with windows partition manager, so I think I need some kind of tool. which one? next problem I'll probably have is that I won't be able to boot ubuntu after installing windows because grub will be removed from my MBR. are there any good guides around here? I've used some kind of tool before, but it crashed my whole HDD so I had to fully format it.

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  • Why was libhal removed in Ubuntu 13.10?

    - by I-Jo
    After installing 13.10, I realized libhal was no longer a sudo apt-get install away... in fact it was no longer anywhere to be found (except in the Raring Repos). And installing libhal from the raring repos is not the best option. It is the best workaround for not having it. Why was it removed? Was it an accidental removal, or is it no longer going to be included in the repos, even in the next LTS? I ask because Amazon (and other services) require it to be installed.

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  • How did craigspro license Craigslist content? [closed]

    - by Joshua Frank
    There's an app called craigspro that provides a much better interface to Craigslist on mobile devices. They claim that the app is Officially Licensed by Craigslist, but I thought Craigslist never licensed their content, and the only thing I can find on the subject in the terms of use is this: Any copying, aggregation, display, distribution, performance or derivative use of craigslist or any content posted on craigslist whether done directly or through intermediaries (including but not limited to by means of spiders, robots, crawlers, scrapers, framing, iframes or RSS feeds) is prohibited. As a limited exception, general purpose Internet search engines and noncommercial public archives will be entitled to access craigslist without individual written agreements executed with CL that specifically authorize an exception to this prohibition if ... Does anyone know how do get a "written agreement" with Craigslist, and roughly what their terms would be? Do they charge a fee, or just check that you're not evil? I'll try next with Craigslist directly, but I'd like to get a sense of the landscape before stumbling in.

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  • Customer Webcast: Alcatel-Lucent Creates a Modern User Experience

    - by [email protected]
    Today, customer satisfaction is critical to a company's long-term success. With customers searching the internet to find new solutions and offerings, it's more important than ever to deliver a modern and engaging user experience that's both interactive and community-based. Join us on June 30th for this exclusive LIVE Webcast with Saeed Hosseiniyar, CIO of Alcatel-Lucent's Enterprise Products Group, and Andy MacMillan, Vice President of Product Management for Oracle's Enterprise 2.0 Solutions. You'll learn how a modern customer service portal with integrated Web 2.0 and social media features can: Improve customer satisfaction by delivering rich, personalized and interactive content Speed product development by facilitating participation and feedback from customers through online communities Improve ROI with a unified platform that delivers content to employees, partners and customers You'll walk away with concrete strategies, best practices and real-world insights on how to transform your company's brand with a next-generation customer service and support site. Register today for this complimentary live Webcast!

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  • Interactive training site for Javascript complete with code challenges [closed]

    - by Chase Florell
    A few months ago I discovered a cool course called Rails for Zombies. This is a great site that allows us to write code and see the results. It takes us through the paces to get us up to speed with Rails. You have to pass each level (including code challenges) before being taken to the next level, and it gets you grounded in the fundamentals of Rails. I'm wondering if an interactive tutorial site exists for Javascript? One that will walk me through the paces of writing better Javascript, and challenge me along the way.

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  • Errors happen when using World.destroyBody( Body body )

    - by minami
    on Android application using libgdx, when I use World.destroyBody( Body body ) method, once in a while the application suddenly shuts down. Is there some setting I need to do with body collision or Box2DDebugRenderer before I destroy bodies? Below is the source I use for destroying bodies. private void deleteUnusedObject( ) { for( Iterator<Body> iter = mWorld.getBodies() ; iter.hasNext() ; ){ Body body = iter.next( ) ; if( body.getUserData( ) != null ) { Box2DUserData data = (Box2DUserData) body.getUserData( ) ; if( ! data.getActFlag() ) { if( body != null ) { mWorld.destroyBody( body ) ; } } } } } Thanks

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  • Oracle Linked Servers on Windows Server 2008 R2

    - by John Paul Cook
    Oracle hasn’t yet released versions of its client software for Windows Server 2008 R2. If you need to create an Oracle linked server, that’s a problem. You’ll see this installation block when attempting to install the Oracle client software for Windows Server 2008: It’s very simple to fix. Check the first checkbox to make the installer ignore the version check. Click Next and ignore the warning you’ll see. The installation should complete successfully. Windows does offer various strategies for mitigating...(read more)

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  • How does throwing an ArgumentNullException help?

    - by Scott Whitlock
    Let's say I have a method: public void DoSomething(ISomeInterface someObject) { if(someObject == null) throw new ArgumentNullException("someObject"); someObject.DoThisOrThat(); } I've been trained to believe that throwing the ArgumentNullException is "correct" but an "Object reference not set to an instance of an object" error means I have a bug. Why? I know that if I was caching the reference to someObject and using it later, then it's better to check for nullity when passed in, and fail early. However, if I'm dereferencing it on the next line, why are we supposed to do the check? It's going to throw an exception one way or the other. Edit: It just occurred to me... does the fear of the dereferenced null come from a language like C++ that doesn't check for you (i.e. it just tries to execute some method at memory location zero + method offset)?

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  • VS 2010, Silverlight, WP 7, Azure, F#, jQuery & more take Center Stage at India's Definitive Microso

    Microsoft has announced a slew of new and exciting releases that will help you take your code to the next level in 2010. As one of the longest running independent developer conferences in India, GIDS.NET at the Great Indian Developer Summit 2010 is uniquely positioned to provide a blend of practical, pragmatic and immediately applicable knowledge and a glimpse of the future of technology. At GIDS.NET, 0n 20 April 2010 in Bangalore, expert speakers will address a wide range of topics, including .NET...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • New Exam Score Report Process Coming Soon

    - by Paul Sorensen
    Hi Everyone! I want to give you a preview of a process change that will be coming in the next few weeks. We will soon announce a change in the way that Oracle certification candidates receive their exam scores and score reports (after they take an exam). Once the change occurs you will need to have an Oracle Web Account (in order to access your exam score). This is the account that is used to log into the Oracle website for things such as OTN access, software downloads and other Oracle services. If you already have an Oracle Web Account then you are already in good shape! If you do not have an Oracle Web Account the you should create one now (in preparation for this change)!  Look for additional announcements and detailed information in the coming weeks. Thanks,

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  • New DataCenter Options for Windows Azure

    - by ScottKlein
    Effective immediately, new compute and storage resource options are now available when selecting data center options in the Windows Azure Portal. "West US" and "East US" options are now available, for Compute and Storage. SQL Azure options for these two data centers will be available in the next few months. The official announcement can be found here.In terms of geo-replication:US East and West are paired together for Windows Azure Storage geo-replicationUS North and South are paired together for Windows Azure Storage geo-replicationThese two new data centers are now visible in the Windows Azure Management Portal effective immediately. Compute and Storage pricing remains the same across all data centers. Get started with Windows Azure through the free 90 day trial.

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  • Question about Web Programming certificate program

    - by user134226
    I am currently attending St. John's University with a major of Computer Science. I am entering my senior year next year and stumbled upon this certificate program for web development from Hunter College: http://www.hunter.cuny.edu/ce/certificates/computer/web-programming So the question is, would it be beneficial for me to complete this program or to just attend a few elective courses in the summer at a school such as NYU? Would this certificate be good for my resume? The only language I have learned so far is Java and classes I have taken in the field so far are: Programming Fundamentals 1 and 2, Data Security and Cryptography, Networking: Data Communications and Introduction to Data Structures Hope some of you can help me out, thanks

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  • What's new with Java technology? Java Embedded

    - by hinkmond
    As this article points out, Java Embedded is a safer, more robust and easier to develop platform for small networked devices. So, get ready for good things to come from Java Embedded... See: Java Embedded: Next New Thing Here's a quote: Through the past few years the industry as we know it has seen a big boom with the mobile and cloud revolution. Today, there has been an enormous amount of buzz around machine to machine (M2M) or the "Internet of Things," since we are moving into a state where everything is going to have to be interconnected and will have to properly communicate together... Today, Java Embedded provides that platform. I like it! As long as there's no Zombie Apocalypse, I think Java Embedded has a great future! Hinkmond

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  • The Messiest Home Offices Ever! [Image Collection]

    - by Asian Angel
    A geek’s home office is a haven to relax in along with being an extension of personal interests and hobbies. But occasionally other people will criticize your setup as being messy, unorganized, or worse…and that is just going too far! The next time someone starts in on you about your home office simply “hit them” with this collection of the messiest home offices ever and put a permanent end to their arguments. WARNING!: Some of the images in this collection come with a strong rating of N.S.F.L. (Not Safe For Lunch), so if you have a squeamish stomach then it would be best if you skip visiting the link below. Untidy Home Offices Photo Collection [via BoingBoing] 6 Start Menu Replacements for Windows 8 What Is the Purpose of the “Do Not Cover This Hole” Hole on Hard Drives? How To Log Into The Desktop, Add a Start Menu, and Disable Hot Corners in Windows 8

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  • What's missing in ASP.NET MVC?

    - by LukaszW.pl
    Hello programmers, I think there are not many people who don't think that ASP.NET MVC is one of the greatest technologies Microsoft gave us. It gives full control over the rendered HTML, provides separation of concerns and suits to stateless nature of web. Next versions of framework gaves us new features and tools and it's great, but... what solutions should Microsoft include in new versions of framework? What are biggest gaps in comparison with another web frameworks like PHP or Ruby? What could improve developers productivity? What's missing in ASP.NET MVC?

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  • Smooth vector based jump

    - by Esa
    I started working on Wolfire's mathematics tutorials. I got the jumping working well using a step by step system, where you press a button and the cube moves to the next point on the jumping curve. Then I tried making the jumping happen during a set time period e.g the jump starts and lands within 1.5 seconds. I tried the same system I used for the step by step implementation, but it happens instantly. After some googling I found that Time.deltatime should be used, but I could not figure how. Below is my current jumping code, which makes the jump happen instantly. while (transform.position.y > 0) { modifiedJumperVelocity -= jumperDrag; transform.position += new Vector3(modifiedJumperVelocity.x, modifiedJumperVelocity.y, 0); } Where modifiedJumperVelocity is starting vector minus the jumper drag. JumperDrag is the value that is substracted from the modifiedJumperVelocity during each step of the jump. Below is an image of the jumping curve:

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  • Cutting desktop power usage

    - by steevc
    I'm on a general energy saving mission. I've finally swapped my old CRT monitor for a LCD, so the next step it to optimise the PC power usage. It's using an AMD 64 X2 4600+ CPU which I know can trottle down, but seems to be running at a constant 2.4GHz. A while back I heard about Granola. I've installed it, but when I try to run it I get granola[10568]: Error opening scaling governor file '/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor' in read mode granola[10568]: Is cpufreq enabled in this kernel and do you have a CPU which supports DVFS? granola[10568]: Can't manage DVFS for any CPUs I'm happy to use other applications if Granola is not optimal or viable.

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  • Application Composer: Exposing Your Customizations in BI Analytics and Reporting

    - by Richard Bingham
    Introduction This article explains in simple terms how to ensure the customizations and extensions you have made to your Fusion Applications are available for use in reporting and analytics. It also includes four embedded demo videos from our YouTube channel (if they don't appear check the browser address bar for a blocking shield icon). If you are new to Business Intelligence consider first reviewing our getting started article, and you can read more about the topic of custom subject areas in the documentation book Extending Sales. There are essentially four sections to this post. First we look at how custom fields added to standard objects are made available for reporting. Secondly we look at creating custom subject areas on the standard objects. Next we consider reporting on custom objects, starting with simple standalone objects, then child custom objects, and finally custom objects with relationships. Finally this article reviews how flexfields are exposed for reporting. Whilst this article applies to both Cloud/SaaS and on-premises deployments, if you are an on-premises developer then you can also use the BI Administration Tool to customize your BI metadata repository (the RPD) and create new subject areas. Whilst this is not covered here you can read more in Chapter 8 of the Extensibility Guide for Developers. Custom Fields on Standard Objects If you add a custom field to your standard object then it's likely you'll want to include it in your reports. This is very simple, since all new fields are instantly available in the "[objectName] Extension" folder in existing subject areas. The following two minute video demonstrates this. Custom Subject Areas for Standard Objects You can create your own subject areas for use in analytics and reporting via Application Composer. An example use-case could be to simplify the seeded subject areas, since they sometimes contain complex data fields and internal values that could confuse business users. One thing to note is that you cannot create subject areas in a sandbox, as it is not supported by BI, so once your custom object is tested and complete you'll need to publish the sandbox before moving forwards. The subject area creation processes is essentially two-fold. Once the request is submitted the ADF artifacts are generated, then secondly the related metadata is sent to the BI presentation server API's to make the updates there. One thing to note is that this second step may take up to ten minutes to complete. Once finished the status of the custom subject area request should show as 'OK' and it is then ready for use. Within the creation processes wizard-like steps there are three concepts worth highlighting: Date Flattening - this feature permits the roll up of reports at various date levels, such as data by week, month, quarter, or year. You simply check the box to enable it for that date field. Measures - these are your own functions that you can build into the custom subject area. They are related to the field data type and include min-max for dates, and sum(), avg(), and count() for  numeric fields. Implicit Facts - used to make the BI metadata join between your object fields and the calculated measure fields. The advice is to choose the most frequently used measure to ensure consistency. This video shows a simple example, where a simplified subject area is created for the customer 'Contact' standard object, picking just a few fields upon which users can then create reports. Custom Objects Custom subject areas support three types of custom objects. First is a simple standalone custom object and for which the same process mentioned above applies. The next is a custom child object created on a standard object parent, and finally a custom object that is related to a parent object - usually through a dynamic choice list. Whilst the steps in each of these last two are mostly the same, there are differences in the way you choose the objects and their fields. This is illustrated in the videos below.The first video shows the process for creating a custom subject area for a simple standalone custom object. This second video demonstrates how to create custom subject areas for custom objects that are of parent:child type, as well as those those with dynamic-choice-list relationships. &lt;span id=&quot;XinhaEditingPostion&quot;&gt;&lt;/span&gt; Flexfields Dynamic and Extensible Flexfields satisfy a similar requirement as custom fields (for Application Composer), with flexfields common across the Fusion Financials, Supply Chain and Procurement, and HCM applications. The basic principle is when you enable and configure your flexfields, in the edit page under each segment region (for both global and context segments) there is a BI Enabled check box. Once this is checked and you've completed your configuration, you run the Scheduled Process job named 'Import Oracle Fusion Data Extensions for Transactional Business Intelligence' to generate and migrate the related BI artifacts and data. This applies for dynamic, key, and extensible flexfields. Of course there is more to consider in terms of how you wish your flexfields to be implemented and exposed in your reports, and details are given in Chapter 4 of the Extending Applications guide.

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