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• What advantages switching to ruby might give me as a python programmer ?

  - by Richard Placide

  This is my first question on stackoverflow, so please bear with me. I'm trying to stay away from any form of trolling or flame baiting as i have a tremendous respect for both languages. I'm a python programmer (though not an expert) and i love it. My first language was C++. My line of work (web development) is pushing me towards other languages like php and javascript. Recently, I've been very excited by Ruby's increasing popularity. However I used to be under the impression that Python and Ruby were so close that there was little point in trying to learn and master both. But I get the sense that I was wrong, hence my question : I'd like to hear from python programmers who have either switched entirely to ruby or added ruby to their toolset. What specific benefits did you get from switching (entirely or partially) to Ruby from Python ? Ideally I'd like to hear from real world experiences.

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• 410 Responses when your CMS host doesn't support them?

  - by leeand00

  Sending a 410 responses for a page that no longer exist should make Google stop crawling for that page. The site I am working on has been recently migrated, and very little of the content was migrated. I've already turned the existing content into 301 redirects (the content that is on both the old and the new site), but now I would like to flush the old content from Google's memory by placing 410 responses in it's path when it returns to crawl for them and finds a 404 response. However, I asked our CMS host about it, and they said that our CMS does not support 410 responses. Is there some other way to post a 410 response, like making a dead link 301 redirect to a page that a 410 response in the form of a meta tag?

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• Pitch camera around model

  - by ChocoMan

  Currently, my camera rotates with my model's Y-Axis (yaw) perfectly. What I'm having trouble with is rotating the X-Axis (pitch) along with it. I've tried the same method for cameraYaw() in the form of cameraPitch(), while adjusting the axis to Vector.Right, but the camera wouldn't pitch at all in accordance to the Y-Axes of the controller. Is there a way similar to this to get the same effect for pitching the camera around the model? // Rotates model on its own Y-axis public void modelRotMovement(GamePadState pController) { Yaw = pController.ThumbSticks.Right.X * MathHelper.ToRadians(speedAngleMAX); AddRotation = Quaternion.CreateFromYawPitchRoll(Yaw, 0, 0); ModelLoad.MRotation *= AddRotation; MOrientation = Matrix.CreateFromQuaternion(ModelLoad.MRotation); } // Orbit (yaw) Camera around model public void cameraYaw(Vector3 axis, float yaw, float pitch) { Pitch = pController.ThumbSticks.Right.Y * MathHelper.ToRadians(speedAngleMAX); ModelLoad.CameraPos = Vector3.Transform(ModelLoad.CameraPos - ModelLoad.camTarget, Matrix.CreateFromAxisAngle(axis, yaw)) + ModelLoad.camTarget; } public void updateCamera() { cameraYaw(Vector3.Up, Yaw); }

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• Making XNA Play Nice With 3DS Max, Boundiing Spheres

  - by Jason R. Mick

  I'm using 3DS Max 2010 with the KW x-porter plugin, which outputs a .X file (just downloaded the very latest version). Been getting some odd results: http://www.picvalley.net/u/2930/2265240220441812321333990933PAStFeSONWQslOrMQC5q.PNG Looks like the culling is screwed up. Note, that models I make in Milkshape don't seem to be having these problems. I've also tried to export an FBX file from 3DS Max 2010 and have been getting similar results. What are your suggestions in terms of exporting *.3DS models to a workable XNA form? What tools do you use?. To be clear, the model in question has none of these defects when viewed from similar angles in 3DS Max 2010. http://www.picvalley.net/u/2563/151728957814855401111333991302mSvEJ03Zv22GwHFgIhiV.PNG Any ideas on this oddity would also be appreciated! Edit 1 -- Add'l issue Forgot to mention, that the model otherwise seems alright, but that rotation seems to double -- in other words, when I scroll my camera view left to right, the model (whose draw I give the camera for the view and perspective matrices w/ BasicEffect seems to rotate twice as much as models I draw natively in XNA

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• How to explain to non-technical person why the task will take much longer then they think?

  - by Mag20

  Almost every developer has to answer questions from business side like: Why is going to take 2 days to add this simple contact form? When developer estimates this task, they may divide it into steps: make some changes to Database optimize DB changes for speed add front end HTML write server side code add validation add client side javascript use unit tests make sure SEO is setup is working implement email confirmation refactor and optimize the code for speed ... These maybe hard to explain to non-technical person, who basically sees the whole task as just putting together some HTML and creating a table to store the data. To them it could be 2 hours MAX. So is there a better way to explain why the estimate is high to non-developer?

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• Live boot from hard disk problem

  - by user172277

  I've installed Ubuntu Desktop 13.04 32bit. Next I configured /etc/grub.d/40_custom to boot live system from ubuntu.iso (also Desktop 13.04 32 bit) I used configuration: menuentry "Ubuntu 13.04 Desktop" { loopback loop /boot/ubuntu.iso linux (loop)/casper/vmlinuz.efi boot=casper iso-scan/filename=/boot/ubuntu.iso noeject noprompt splash -- initrd (loop)/casper/initrd.lz } and it works OK. Later I made some changes on my installed ubuntu. I made some configuration, installed additional packages and so on. After that I made backup using remastersys tool. Remastersys gave me new ISO file. So I wanted to use it. And here was first problem. Remastersys creates only initrd.gz file. So I changed the grub configuration form: initrd (loop)/casper/initrd.lz to: initrd (loop)/casper/initrd.gz But after that, when I reboot my system I get error: /init: line 3: can't open /dev/sr0: No medium found Any ideas how to fix it? Best Regards, Bartosz

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• Sendmail not working as desired in bash script

  - by dan08

  This is the code I have in a bash script that runs as a cronjob. The cronjob run as root. /usr/sbin/sendmail [email protected]<<EOF subject:Backup Error! from:backup@server01 $error EOF There is code after this and the email I get is as follows: From the root user on the machine. and the message includes: subject:Backup Error! from:backup@server01 $error EOF More code... that is in the script all the way to the end... I have tried other variations, this is the closest I've got. I tried this in a regular script and it worked properly. Whats going on, and how can I send this email, specifying the subject and form sender?

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• 24 Hours of PASS: 15 Powerful Dynamic Management Objects - Deck and Demos

  - by Adam Machanic

  Thank you to everyone who attended today's 24 Hours of PASS webcast on Dynamic Management Objects! I was shocked, awed, and somewhat scared when I saw the attendee number peak at over 800. I really appreciate your taking time out of your day to listen to me talk. It's always interesting presenting to people I can't see or hear, so I relied on Twitter for a form of nearly real-time feedback. I would like to especially thank everyone who left me tweets both during and after the presentation. Your feedback...(read more)

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• InnoDB Compression Improvements in MySQL 5.6

  - by Inaam Rana

  MySQL 5.6 comes with significant improvements for the compression support inside InnoDB. The enhancements that we'll talk about in this piece are also a good example of community contributions. The work on these was conceived, implemented and contributed by the engineers at Facebook. Before we plunge into the details let us familiarize ourselves with some of the key concepts surrounding InnoDB compression. In InnoDB compressed pages are fixed size. Supported sizes are 1, 2, 4, 8 and 16K. The compressed page size is specified at table creation time. InnoDB uses zlib for compression. InnoDB buffer pool will attempt to cache compressed pages like normal pages. However, whenever a page is actively used by a transaction, we'll always have the uncompressed version of the page as well i.e.: we can have a page in the buffer pool in compressed only form or in a state where we have both the compressed page and uncompressed version but we'll never have a page in uncompressed only form. On-disk we'll always only have the compressed page. When both compressed and uncompressed images are present in the buffer pool they are always kept in sync i.e.: changes are applied to both atomically. Recompression happens when changes are made to the compressed data. In order to minimize recompressions InnoDB maintains a modification log within a compressed page. This is the extra space available in the page after compression and it is used to log modifications to the compressed data thus avoiding recompressions. DELETE (and ROLLBACK of DELETE) and purge can be performed without recompressing the page. This is because the delete-mark bit and the system fields DB_TRX_ID and DB_ROLL_PTR are stored in uncompressed format on the compressed page. A record can be purged by shuffling entries in the compressed page directory. This can also be useful for updates of indexed columns, because UPDATE of a key is mapped to INSERT+DELETE+purge. A compression failure happens when we attempt to recompress a page and it does not fit in the fixed size. In such case, we first try to reorganize the page and attempt to recompress and if that fails as well then we split the page into two and recompress both pages. Now lets talk about the three major improvements that we made in MySQL 5.6.Logging of Compressed Page Images:InnoDB used to log entire compressed data on the page to the redo logs when recompression happens. This was an extra safety measure to guard against the rare case where an attempt is made to do recovery using a different zlib version from the one that was used before the crash. Because recovery is a page level operation in InnoDB we have to be sure that all recompress attempts must succeed without causing a btree page split. However, writing entire compressed data images to the redo log files not only makes the operation heavy duty but can also adversely affect flushing activity. This happens because redo space is used in a circular fashion and when we generate much more than normal redo we fill up the space much more quickly and in order to reuse the redo space we have to flush the corresponding dirty pages from the buffer pool.Starting with MySQL 5.6 a new global configuration parameter innodb_log_compressed_pages. The default value is true which is same as the current behavior. If you are sure that you are not going to attempt to recover from a crash using a different version of zlib then you should set this parameter to false. This is a dynamic parameter.Compression Level:You can now set the compression level that zlib should choose to compress the data. The global parameter is innodb_compression_level - the default value is 6 (the zlib default) and allowed values are 1 to 9. Again the parameter is dynamic i.e.: you can change it on the fly.Dynamic Padding to Reduce Compression Failures:Compression failures are expensive in terms of CPU. We go through the hoops of recompress, failure, reorganize, recompress, failure and finally page split. At the same time, how often we encounter compression failure depends largely on the compressibility of the data. In MySQL 5.6, courtesy of Facebook engineers, we have an adaptive algorithm based on per-index statistics that we gather about compression operations. The idea is that if a certain index/table is experiencing too many compression failures then we should try to pack the 16K uncompressed version of the page less densely i.e.: we let some space in the 16K page go unused in an attempt that the recompression won't end up in a failure. In other words, we dynamically keep adding 'pad' to the 16K page till we get compression failures within an agreeable range. It works the other way as well, that is we'll keep removing the pad if failure rate is fairly low. To tune the padding effort two configuration variables are exposed. innodb_compression_failure_threshold_pct: default 5, range 0 - 100,dynamic, implies the percentage of compress ops to fail before we start using to padding. Value 0 has a special meaning of disabling the padding. innodb_compression_pad_pct_max: default 50, range 0 - 75, dynamic, the  maximum percentage of uncompressed data page that can be reserved as pad.

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• How to position a sprite in a 2D animation skeleton?

  - by Paul Manta

  Given two joints that define a bone, I would like to know how to decide where, between those two joints, I should draw the sprite. This should be a fairly simple thing to solve, but there is one thing that I am not sure about. After I've determined the rotation of the sprite (which is the absolute angle the joints form with the x-axis), I also need to determine the origin point from where I need to start drawing the transformed image. So how should I position the sprite between the two joints? Should I make the center of the image be the midpoint between the two joints, or should I make one the of the joints be the origin? Do these things matter that much (could the wrong positioning make the sprite move oddly during the animation)?

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• How can I unit test a class which requires a web service call?

  - by Chris Cooper

  I'm trying to test a class which calls some Hadoop web services. The code is pretty much of the form: method() { ...use Jersey client to create WebResource... ...make request... ...do something with response... } e.g. there is a create directory method, a create folder method etc. Given that the code is dealing with an external web service that I don't have control over, how can I unit test this? I could try and mock the web service client/responses but that breaks the guideline I've seen a lot recently: "Don't mock objects you don't own". I could set up a dummy web service implementation - would that still constitute a "unit test" or would it then be an integration test? Is it just not possible to unit test at this low a level - how would a TDD practitioner go about this?

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• How do I Set PATH in /etc/profile.d?

  - by Rodrigo Sasaki

  I'm using zsh as my shell, and I'm trying to configure my environment. I usually define my $JAVA_HOME variable by creating a file: /etc/profile.d/java.sh with the following content export JAVA_HOME=/path/to/jdk export PATH=$JAVA_HOME/bin:$PATH then I logout and back in, and it all works, but for some reason the PATH variable is not set. It recognizes JAVA_HOME, but not the new PATH, see this terminal snippet: ~ echo $JAVA_HOME /usr/lib/jvm/jdk1.8.0_05 ~ echo $PATH /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games and I confirmed it by trying to run a command form the jvm ~ java -version zsh: command not found: java the PATH doesn't include the $JAVA_HOME as it should. is there something else I should check? EDIT I have checked that if I run source /etc/profile.d/java.sh it all runs correctly and my variables get set as they should, but shouldn't the scripts in /etc/profile.d run automatically?

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• Cloud Control 12c: Verteilen von beliebiger Software mit Deployment Prozeduren

  - by Ralf Durben (DBA Community)

  Mit dem Lifecycle Management Pack von Oracle Enterprise Manager Cloud Control 12c können Sie Software aus der grafischen Konsole heraus auf Zielsysteme verteilen und installieren, also provisionieren. Dieses funktioniert für viele Oracle Produkte in einer vorgefertigen Form unter Verwendung von Deployment Prozeduren, die als eine Art Spezialformat für Provisionierungsskripte angesehen werden können. Dabei können die vorgefertigten Deployment Prozeduren direkt oder für die eigenen Bedürfnisse modifiziert verwendet werden. Sie können diese Technik jedoch auch für die Provisionierung beliebiger Software nutzen, indem Sie eigene Deployment Prozeduren erstellen. Als einfaches Beispiel einer solchen Provisionierung soll in diesem Tipp das Verteilen einer ZIP-Datei mit anschliessendem Auspacken betrachtet werden. Bewusst wird in diesem Tipp versucht, das Beispiel einfach zu halten, um einen leichten Einstieg zu ermöglichen. Dieser Tipp zeigt Ihnen, wie Sie eine ZIP-Datei mit einer selbstgeschriebenen Deployment Prozedur provisionieren können.

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• Philly GiveCamp 2010

  - by wulfers

  Spent the weekend helping out several non-profits doing what we like to do best...  Designing, developing and making people very happy with their new websites, systems, applications and features.  Form what I saw at this GiveCamp about 75 percent of the non-profits needed updated or new websites supporting CMS features and the ability for staff members to update the content on their websites.... Some cool apps were designed and developed..... A centralized system for distribution of daily schedules and task assistance to autistic clients was a show stopper with an awesome central management interface, IPhone and in the future windows phone support for tactile, auditory and visual cues. SharePoint was upgraded and forms were automated for a volunteer fire company that desperately needed some automation to help the fireman do their primary job. Many cool sites for non-profits that had ether an outdated or non existent web presence.

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• Is there a difference between "." and "source" in bash, after all?

  - by ysap

  I was looking for the difference between the "." and "source" builtin commands and a few sources (e.g., in this discussion, and the bash manpage) suggest that these are just the same. However, following a problem with environment variables, I conducted a test. I created a file testenv.sh that contains: #!/bin/bash echo $MY_VAR In the command prompt, I performed the following: > chmod +x testenv.sh > MY_VAR=12345 > ./testenv.sh > source testenv.sh 12345 > MY_VAR=12345 ./testenv.sh 12345 [note that the 1st form returned an empty string] So, this little experiment suggests that there is a difference after all, where for the "source" command, the child environment inherits all the variables from the parent one, where for the "." it does not. Am I missing something, or is this is an undocumented/deprecated feature of bash? [ GNU bash, version 4.1.5(1)-release (x86_64-pc-linux-gnu) ]

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• How do I write a good talk proposal for a FOSS programming conference?

  - by Andrew Grimm

  I'm hoping to give a talk at RubyKaigi this year, and I'd like to know what makes a good talk proposal. RubyKaigi is a conference run by Ruby enthusiasts (as opposed to it being a trade conference, or an academic conference). The proposal form can be seen here. So far, my draft proposal about a program I'm working on mentions: What the program is useful for and why it is relevant. How it works. What topics it touches upon (such as metaprogramming and testing) Is there anything that I should mention in my proposal? Also, how thorough should I be in my "Details of your talk" section? Should I be exhaustive, or only have a couple of short paragraphs?

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• Google Analytics conversion tracking - referrals from payment provider

  - by martynas

  I have a question regarding conversion tracking using Google Analytics. My client uses an external payment service provider - SecureTrading. Problem: All website visitors who would like to make a purchase are taken to a payment form on https://securetrading.net and are redirected back after a successful payment. Google Analytics counts that as a referral and messes up conversion tracking stats. Question: What needs to be changed / added in the payment forms or Google Analytics settings so that the conversions would be assigned to the right traffic sources. Screenshot:

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• Combining Multiple Queries and Parameters into One Operation

  - by shay.shmeltzer

  This question came up twice this week and while the solution is explained in a couple of previous blog entries I did, I thought that showing off the complete solution in a single video would be nice. The scenario is that you have two VOs with queries that are based on a parameter, I showed in the past how to create a parameter form that executes the query - and you can do this for both. But what if you actually need just one value to drive both queries? How do you combine two parameter forms and two buttons into one? This is what this video shows you. The steps are: Creating two parameter forms Setting the value of a parameter in the binding tab Creating a backing bean to execute the code for one button Adding the code to execute another operation Remarking the parts that can be dropped from the screen Check it out here:

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• Friday Fun: The Rise of Atlantis

  - by Asian Angel

  The best day of the work week is finally here, so take a few minutes to have some fun while waiting to go home. In this week’s game you set off on a campaign across ancient Mediterranean regions to acquire multiple artifacts in a quest for success. Special Note: This flash version of the game allows you to play through three areas (Phoenicia, Babylon, and Egypt) of the overall campaign that is available in the full version. Even in its limited form it still provides a good amount of game play. How to See What Web Sites Your Computer is Secretly Connecting To HTG Explains: When Do You Need to Update Your Drivers? How to Make the Kindle Fire Silk Browser *Actually* Fast!

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• Resources for up-to-date Delphi programming

  - by Dan Kelly

  I'm a developer in a small department and have been using Delphi for the last 10 years. Whilst I've tried to keep up-to-date with movements there are a lot of changes that have occurred between Delphi 7 and (current for us) 2010. Stack Exchange and here have been great for answering the "how do you" questions, but what I'd like is a resource that shows great examples of larger scale programming. For example is there anywhere that hosts examples of well written, multi form applications? Something that can be looked at as a whole to illustrate why things should be done a certain way?

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• Is Perforce as good as merging as DVCSs?

  - by dukeofgaming

  I've heard that Perforce is very good at merging, I'm guessing this has to do with that it tracks changes in the form of changelists where you can add differences across several files in a single blow. I think this implies Perforce gathers more metadata and therefore has more information to do smarter merging (at least smarter than Subversion, being Perforce centralized). Since this is similar to how Mercurial and Git handle changes (I know DVCSs track content rather than files), I was wondering if somebody knew what were the subtle differences that makes Perforce better or worse than a DVCS like Mercurial or Git.

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• Problems creating a debdiff

  - by Chris Wilson

  I'm following this guide to create a debdiff for a package I'm patching. Everything goes fine until step number 8 and I attempt to create the debdiff after committing the changes. The package in question is Zim, pulled form Launchpad using bzr branch lp:zim and according to this guide I should execute the following command to create the debdiff: debdiff zim_0.49.dsc zim_0.49ubuntu1.dsc > zim_0.49ubuntu1.debdiff however, when I actually try to execute this command, I get the following error: debdiff: fatal error at line 314: Can't read file: zim_0.49.dsc Upon inspection of the directory in which the files created from debuild -S (step 6) are deposited, I find zim_0.49ubuntu1_source.changes zim_0.49ubuntu1.dsc zim_0.49ubuntu1.tar.gz zim_0.49ubuntu1_source.build but no sign of zim_0.49.dsc. I could probably create one by debuilding the package as soon as I check out the code, before starting work, but that would add an extraneous entry in the changelog. Is there a step missing from the guide that creates zim_0.49.dsc or is the file itself missing from the source?

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• Best way to block "comment spam" postings to web forms? [closed]

  - by David Jones

  Possible Duplicate: Make your site anti-bot? I have a custom web form on my PHP-based site. Recently it is getting a regular stream of comment-spam postings from a few specific IP addresses. Question: What is a good way to block a small set of blacklisted IP addresses from accessing my site? I was thinking it should be possible using .htaccess to respond with status code 403 (Forbidden) for all HTTP requests from the blacklisted IP addresses, ... but I am not sure exactly how to do that. If anyone knows the .htaccess syntax needed to accomplish this, ... please let me know. thanks in advance,

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• OpenGL: Filtering/antialising textures in a 2D game

  - by futlib

  I'm working on a 2D game using OpenGL 1.5 that uses rather large textures. I'm seeing aliasing effects and am wondering how to tackle those. I'm finding lots of material about antialiasing in 3D games, but I don't see how most of that applies to 2D games - e.g. antisoptric filtering seems to make no sense, FSAA doesn't sound like the best bet either. I suppose this means texture filtering is my best option? Right now I'm using bilinear filtering, I think: glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); From what I've read, I'd have to use mipmaps to use trilinear filtering, which would drive memory usage up, so I'd rather not. I know the final sizes of all the textures when they are loaded, so can't I somehow size them correctly at that point? (Using some form of texture filtering).

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• On-the-fly graphical representation of code

  - by dukeofgaming

  I know about Omondo's plugin for live code-UML synchronization in Eclipse, but I was wondering if there was any other tool/IDE/IDE-extension that has some form of live graphical code representaiton (structural, flow, call-stacks, dependencies, etc.). I'm essentially looking for richer visual feedback on code while programming, not really looking for purely graphical code editors, though round-trips would be nice (edit graphically, code gets modified; edit code, representation gets modified). If you don't know about any graphical live documentation tool for code, maybe someone that can coexist with code, such as MySQL Workbench or Enterprise Architect.

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