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• Should I use parentheses in logical statements even where not necessary?

  - by Jeff Bridgman

  Let's say I have a boolean condition a AND b OR c AND d and I'm using a language where AND has a higher order of operation precedent than OR. I could write this line of code: If (a AND b) OR (c AND d) Then ... But really, that's equivalent to: If a AND b OR c AND d Then ... Are there any arguments in for or against including the extraneous parentheses? Does practical experience suggest that it is worth including them for readability? Or is it a sign that a developer needs to really sit down and become confident in the basics of their language?

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• Getting a texture from a renderbuffer in OpenGL?

  - by Rushyo

  I've got a renderbuffer (DepthStencil) in an FBO and I need to get a texture from it. I can't have both a DepthComponent texture and a DepthStencil renderbuffer in the FBO, it seems, so I need some way to convert the renderbuffer to a DepthComponent texture after I'm done with it for use later down the pipeline. I've tried plenty of techniques to grab the depth component from the renderbuffer for weeks but I always come out with junk. All I want at the end is the same texture I'd get from an FBO if I wasn't using a renderbuffer. Can anyone post some comprehensive instructions or code that covers this seemingly simple operation? EDIT: Linky to an extract version of the code http://dl.dropbox.com/u/9279501/fbo.cs Screeny of the Depth of Field effect + FBO - without depth(!) http://i.stack.imgur.com/Hj9Oe.jpg Screeny without Depth of Field effect + FBO - depth working fine http://i.stack.imgur.com/boOm1.jpg

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• Resize images to specific height value in ImageMagick?

  - by Jason

  I've looked around for this, and can't find an easily implemented solution. Currently I'm working on an application that deals with panoramas. As they come out of the batch stitch process, the dimensions average 18000x4000. Using ImageMagick, how can I downscale those images to a specific height value while maintaining aspect ratio? According to the manual, the convert operation takes in both height and width to resize to while maintaining the same aspect ratio. What I'd like is to put in 600 and 1000 in my existing resize script function and have both a regular viewable image as well as a reduced size.

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• Uploading Files Using ASP.NET Web Forms, Generic Handler and jQuery

  - by bipinjoshi

  In order to upload files from the client machine to the server ASP.NET developers use FileUpload server control. The FileUpload server control essentially renders an INPUT element with its type set to file and allows you to select one or more files. The actual upload operation is performed only when the form is posted to the server. Instead of making a full page postback you can use jQuery to make an Ajax call to the server and POST the selected files to a generic handler (.ashx). The generic handler can then save the files to a specified folder. The remainder of this post shows how this can be accomplished.http://www.bipinjoshi.net/articles/f2a2f1ee-e18a-416b-893e-883c800f83f4.aspx      

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• Microsoft propose Office 2010 Professionnel pour le prix d'Office 2010 Standard jusqu'à fin mars, et des réductions sur Windows 7

  Microsoft propose Office 2010 Professionnel pour le prix d'Office 2010 Standard Jusqu'à fin mars, et des réductions sur Windows 7 Professionel Microsoft vient de lancer une opération qui ravira les professionnels qui souhaitent passer à Office 2010. Jusqu'à la fin du mois de mars, la version Professionnel Plus de la suite bureautique est en effet au même prix que la licence standard. Selon l'organisation concernée (PME, secteur public , etc.) l'économie va de 125€ à plus de 190€ par licence. Une économie qui se matérialise sous la forme d'un remboursement après achat. A noter cependant que pour bénéficier de cette ristourne, le nombre de licences minimum à commander est fixé à 4...

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• PHP, when to use iterators, how to buffer results?

  - by Jon L.

  When is it best to use Iterators in PHP, and how can they be implemented to best avoid loading all objects into memory simultaneously? Do any constructs exist in PHP so that we can queue up results of an operation for use with an Iterator, while again avoiding loading all objects into memory simultaneously? An example would be a curl HTTP request against a REST server In the case of an HTTP request that returns all results at once (a la curl), would we be better off to go with streaming results, and if so, are there any limitations or pitfalls to be aware of? If using streaming, is it better to replace curl with a PHP native stream/socket? My intention is to implement Iterators for a REST client, and separately a document ORM that I'm maintaining, but only if I can do so while gaining benefits from reduced memory usage, increased performance, etc. Thanks in advance for any responses :-)

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• Google Chrome side by side stable beta unstable. How to approach?

  - by sobi3ch

  I have the stable version of Google Chrome on my box. And each time I'm trying to install beta or/and unstable versions then I run into the same problem: The following packages will be REMOVED google-chrome-stable The following NEW packages will be installed google-chrome-beta 0 upgraded, 1 newly installed, 1 to remove and 0 not upgraded. Need to get 34.5 MB of archives. After this operation, 3,109 kB of additional disk space will be used. Do you want to continue [Y/n]? I need to remove the first version before installing another. How can I install stable and beta (and maybe unstable as well) next to each other?

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• Write data to SQL Server directly from BizTalk or use external service?

  - by dlongest

  An external source will be sending us XML data that BizTalk will pick up and transform into an internal schema. We need this data to be loaded into a SQL Server database as we're going to expose some of the data to our web front-end via a custom WCF service. The question is: what is the recommended approach for doing something like this? Options we're considering are having BizTalk write to the database directly or having BizTalk call a custom WCF service which would handle the save operation. Another briefly considered idea was having BizTalk write to an MSMQ and have a custom service pull from there and store it in the database. What are some of the guidelines or questions that should be asked in assessing these options? There are concerns related to overhead from calling the extra service, duplication of efforts if the schema is modified in the future (which it will be to some extent), and simply the best way to design within a service-oriented architecture that we're struggling with.

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• Why are Back In Time snapshots so large?

  - by Chethan S.

  I just backed up the contents of my home partition onto my external hard drive using Back In Time. I browsed to the backed up contents in the external drive and under properties it showed me the size as 9.6 GB. As I read that in next snapshots I create, Back In Time does not backup everything but creates hard links for older contents and saves newer contents, I wanted to test it. So I copied two small files into my home partition and ran 'Take Snapshot' again. The operation completed within a minute - first it checked previous snapshot, assessed the changes, detected two new files and synced them. After this when I browsed to the backed up contents, I was surprised to see the newer and older backup taking up 9.6 GB each. Isn't this a waste of hard drive space? Or did I interpret something wrongly?

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• I want to try and find an RFC for Business Listings.

  - by nc01

  I'm trying to figure out how to find out if there's a good standard format for sharing business information such as: Business Name Address - well-defined fields Lat,Lng Coords Business Type - maybe from a well-defined enum, my starting point contains Retail,Food,Drink,Coffee,Service Hours of operation - including a spot for 'except laksdasd' or 'sometimes we open late' which could be just plain language Business Keywords - don't know if this is asking too much. how well do http meta tags work in practice? So, if no such thing exists, is this something I can submit to IETF? I can't currently find it on http://www.rfc-editor.org/cgi-bin/rfcsearch.pl , and vCard doesn't suit my needs.. Thanks!

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• Is it possible for an application (written in Mono C#) to run a console command?

  - by Razick

  I am wondering if a Mono C# application can somehow run a terminal command. For example, could the user give the program his or her password and then have the application run sudo apt-get install application-name (console requests password) password (console requests confirmation) y Preferably, this would be done without actually opening a terminal visible to the user, so that the application could provide the necessary feedback and manage the whole operation cleanly with as little user interaction as possible. Is there a way to do that? Let me know if clarification is needed. Thank you!

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• Ce que Microsoft a appris de la lutte contre les botnets, exposé par l'un de ses chercheurs

  Mise à jour du 20.03.2010 par Katleen Ce que Microsoft a appris en matière de lutte contre les botnets, exposé par l'un de ses chercheurs "Voici publiées les premières leçons que nous et d'autres chercheurs avons tirées de l'impact de l'opération b49." Microsoft semble avoir beaucoup appris de son action de neutralisation du botnet Waledac (même si celui-ci a depuis repris du service). Les unités spécialisées de la Digital Crimes Units ont d'abord du attaquer le botnet par couches. Ceci, via des perturbations de communications P2P et des désactivations de noms de domaine pour empêcher les échanges entre les ordinateurs zombies et les serveurs de commande et de ...

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• how to fix error when authenticating in U1

  - by Yann

  Like other users, when authenticating in U1 I get this error: Method "CreateItem" with signature "a{sv}(oayay)b" on interface "org.freedesktop.Secret.Collection" doesn't exist. And in /var/log/auth.log: gnome-keyring-daemon[4793]: egg_symkey_generate_simple: assertion `iterations >= 1' failed gnome-keyring-daemon[4793]: couldn't prepare to write out keyring: /home/yann/.gnome2/keyrings/login_1.keyring So I tried to move "login.keyring". I typed no password for the security when logging into U1, accepted non secured way to save passwords. And a message told me the operation successfully completed (in French). But, sync did not work. And u1sdtool --status returned this: State: AUTH_FAILED connection: With User With Network description: auth failed is_connected: False is_error: True is_online: False queues: WORKING I'm sorry U1 doesn't work anymore; it was really useful to me. Can you help me ? Ubuntu 11.10

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• Getting the front buffer into a gfx mem surface (Dx9)

  - by lapin

  I'm using DirectX 9 to acquire the frontbuffer. There are a couple of ways I know of to get at the front buffer: GetRenderTargetData() GetFrontBufferData() The MSDN page on both of these API calls state that the data is copied from device memory to system memory. I'd like to copy the front buffer surface directly to another graphics memory surface, as I have other manipulations to perform on the acquired surface before returning it to system memory. I'm creating a D3DUSAGE_DYNAMIC texture (gfx mem texture) and calling GetFrontBufferData() to write the front buffer to my textures surface0. Is this valid? Will the operation remain in gfx memory, or will it need to move to system memory and then back to graphics memory? If this is the case, is what I'm trying to achieve possible?

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• Multicast in Ubuntu

  - by iwant2learn

  Can some one please explain the steps required to configure a multicast in Ubuntu? I have a simple program taken from Internet. I get errors when I execute the client program. I get the error as: Opening datagram socket....OK. Setting SO_REUSEADDR...OK. Binding datagram socket...OK. Adding multicast group error: No such device: When I execute the server program I get the error as: Opening the datagram socket...OK. Setting local interface error: Cannot assign requested address I am using Ubuntu to run the program. I have two different laptops but connected via the same network. I am using wireless network to perform the above operation.

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• What are some potential issues in blocking all incoming requests from the Amazon cloud?

  - by ElHaix

  Recently I, along with the rest of the world, have seen a significant increase in what appears to be scraping from Amazon AWS-related sources. So simply put, I blocked all incoming requests from the Amazon cloud for our hosted application. I know that some good services/bots are now hosted on the cloud, and I'm wondering if certain IP addresses should be allowed, as they may gather data that would in the end benefit our site's SEO rankings? -- UPDATE -- I added a feature to block requests from the following hosts: Amazon Softlayer ServerDeals GigAvenue Since then, I have seen my network traffic decrease (monitored by network out bytes). Average operation is around 10,000,000 bytes. You can see where last week I was not blocking, then started blocking. I've since removed the blocks and will see what the outcome is.

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• Neural network input preprocessing

  - by TND

  It's clear that the effectiveness of a neural network depends strongly on the format you give it to work with. You want to preprocess it into the most convenient form you can algorithmically get to, so that the neural network doesn't have to account for that itself. I'm working on a little project that (surprise!) is going to be using neural networks. My future goal is to eventually use NEAT, which I'm really excited about. Anyway, one of my ideas involves moving entities in continuous 2D space, from a top-down perspective (this would be a really cool game AI). Of course, unless these guys are blind, they're going to be able to see the world around them. There's a lot of different ways this information could be fed into the network. One interesting but expensive way is to simply render a top-down "view" of things, with the entities as dots on the picture, and feed that in. I was hoping for something much simpler to use (at least at first), such as a list of the x (maybe 7 or so) nearest entities and their position in relative polar coordinates, orientation, health, etc., but I'm trying to think of the best way to do it. My first instinct was to order them by distance, which would inherently also train the neural network to consider those more "important". However, I was thinking- what if there's two entities that are nearly the same distance away? They could easily alternate indexes in that list, confusing the network. My question is, is there a better way of representing this? Essentially, the issue is the network needs a good way of keeping track of who's who, while knowing (by being inputted) relevant information about the list of entities it can see. Thanks!

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• return to middle click copy and paste ubuntu 13.10

  - by user206999

  Recent update to 13.10 left the middle mouse button turning sound on and off!! How do I get back to being able to copy and paste? Select the text then paste with the middle Wheel mouse button. This is a feature I used to use a lot and I find extremely quick and useful. I know I can use ctrl c, ctrl v, and right click select copy, select paste but this is clunky compared to just being able to click the middle wheel button. Is there a settings menu option to gain correct operation of the middle wheel button?

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• Wireless problems on HP

  - by Sat93

  I'm not able to enable Wireless using the hardware switch on my HP ProBook4430s. Because of this the Enable Wireless option is greyd out and I cannot enable it. The greyd out option can be seen in the screenshot below. The results of iwconfig for my system are as follows, lo no wireless extensions. wlan0 IEEE 802.11bgn ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=off Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off eth0 no wireless extensions. Also I tried to do the following, sudo ifconfig wlan0 up but I got an error as below, SIOCSIFFLAGS: Operation not possible due to RF-kill Also the result of sudo rfkill list all for my system is as follows, 0: phy0: Wireless LAN Soft blocked: no Hard blocked: yes 1: hp-wifi: Wireless LAN Soft blocked: no Hard blocked: no 2: hp-bluetooth: Bluetooth Soft blocked: no Hard blocked: no 3: hci0: Bluetooth Soft blocked: no Hard blocked: no How do I fix this problem? Thanku!

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• SSH not working from outside network

  - by alexander7567

  Ok.. First off my ISP does not block ports. I run web server just fine from another machine. I have port forwarded port 22. I can access within network but not out of.. I.E. my android. I get "The Operation Timed Out" on ConnectBot. Oh and I have allowed 22 on UFW. To answer what exactly happened was my ISP blocks port 22, even though a while back they told me they do not block any ports.. I changed it to port 27 and it worked without a problem.

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• What do I need to learn to decide on rename/recompile source package names because of company rebranding?

  - by Roberto Linares

  My company is currently at a rebranding process and the brand names have been used in the sources' package names but these names are only visible to developers who maintain this code so nobody from project management is really interested in changing them considering also that it would imply the recompiling of several old components. What factors do I need to consider when deciding on a change like that? I don't know if I should worry about legal issues or not and if so, how to address this with project management. More background details. I have all the sources and dependencies but since the company rebranding, other development areas have adopted some of the code that needs package name-changing so I cannot take the decision only by myself so I don't make everyone else's code to crash with my core components and I cannot change other areas' code without the permission of those areas' users so yes, my concern is more political than technical. I am going try to coordinate the involved it areas to make the change anyway, since it seems to be the best approach.   Unfortunatelly in my company there's no continuous integration build server so we build our code manually on demand and to get something to production I have to justify the change (even just the package name changing) to QA with an user requirement and some other bureaucratic documentation so that's why I was hesitating the change in first place.

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• How to xkill an application by its id?

  - by Hanynowsky

  I need to simulate the behavior of the keyboard shortcut (ALT+F4) using Terminal for a given application. If I open for example gedit and click ALT + F4 , then GEDIT will be xkilled. If I want to achieve same thing using Terminal, how should I proceed? The command export PIDTOKILL=pidof gedit | grep [^*]; xkill -id $PIDTOKILL does not work and gives the following error: xkill: killing creator of resource 0x3f38 X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 113 (X_KillClient) Value in failed request: 0x3f38 Serial number of failed request: 8 Current serial number in output stream: 9 I think I am confusing application id and process id here

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• How to fix "Could not open lock file" because "Permission denied"?

  - by user66498

  Whenever trying to install any software and update manger, I get an error stating Package operation failed The installation or removal of a software package failed When I run sudo apt-get update I got this result: conan51xd@conan51xd-Lenovo-B470:~$ sudo apt-get -f install [sudo] password for conan51xd: Reading package lists... Done Building dependency tree Reading state information... Done 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. conan51xd@conan51xd-Lenovo-B470:~$ apt-get update E: Could not open lock file /var/lib/apt/lists/lock - open (13: Permission denied) E: Unable to lock directory /var/lib/apt/lists/ E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied) E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?

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• Did you know you can shrink a transaction log even when log shipping?

  - by simonsabin

  David's posted a great post on shrinking the transaction log and log shipping. Log shipping and shrinking transaction logs Unlike shrinking the data file shrinking the transaction log isn't a bad thing, IF you don't need the log to be that size. I've seen many systems that shrink the log because it has grown only for it to grow the next day to the same size becuase of an overnight operation. To reduce the growth of the transaction log you need to do one or more of the following, 1.Back it up more frequently2.Change to simple recovery model3.Use minimally logged operations4.Keep transactions short and small5.Break large transactions into smaller transactions6.If using replication ensure that your backup of the replication topology is frequent enough

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• What is the name of this array transformation?

  - by Brandon Tilley

  Start with an array of arrays; in this case, they are different lengths in order to demonstrate the technique, but they do not have to be. [[1,2,3,4], [5,6,7], [8,9,10], [11,12,13,14,15]] At the other end of the transformation, you have an array of arrays where the first array contains the first element from each of the original arrays, the second array contains the second element from each of the original arrays, and so on. [[1,5,8,11], [2,6,9,12], [3,7,10,13], [4,14], [15]] Is there a mathematical or CS term for this operation?

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