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• Process arbitrarily large lists without explicit recursion or abstract list functions?

  - by Erica Xu

  This is one of the bonus questions in my assignment. The specific questions is to see the input list as a set and output all subsets of it in a list. We can only use cons, first, rest, empty?, empty, lambda, and cond. And we can only define exactly once. But after a night's thinking I don't see it possible to go through the arbitrarily long list without map or foldr. Is there a way to perform recursion or alternative of recursion with only these functions?

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• Sending keystrokes using Python

  - by Rudi Strydom

  I am trying to build a remote control application to control media on my Ubuntu. Does anyone know a way in order to accomplish this. The media keys in particular. Thank you. EIDT: I have tried using XTE, but is seems python in truncating the input or there is a limit or something which means that you can't do Ctrl + Key key presses, which wont suit my needs. I also tried uinput, but alas you need to run it as root, which also will not quite my needs. Now I am looking at EVDEV which seems promicing, that is if I can get it working.

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• genisoimage and exec bit preservation

  - by user92187

  Maybe I'm just not doing right, but I can't seem to get genisoimage to produce a UDF image and preserve the exec bit. $ genisoimage --version genisoimage 1.1.11 (Linux) $ echo "echo 'Hello world'" > script.sh $ chmod +x script.sh $ ./script.sh Hello world $ genisoimage -input-charset utf-8 -r -udf -volid minimal -o minimal.iso script.sh Total translation table size: 0 Total rockridge attributes bytes: 250 Total directory bytes: 0 Path table size(bytes): 10 Max brk space used 0 420 extents written (0 MB) $ mkdir mount $ sudo mount minimal.iso $PWD/mount -o ro,loop -t udf $ ls -l script.sh mount/script.sh -r--r--r-- 1 root root 19 Sep 21 18:40 mount/script.sh -rwxrwxr-x 1 kip kip 19 Sep 21 18:40 script.sh You'll note in the last command that script.sh was executable at the time it was injected into the image, but does not appear to be inside of the mounted image. Is this a bug in genisoimage, a problem with the way I am mounting the image, or a problem in my usage of genisoimage?

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• Mod_rewrite and urls that don't end with .php

  - by Kevin Laity

  I'm trying to use Mod_rewrite to hide the .php extensions of my pages. However, it refuses to do any rewriting unless the input url ends with .php, which makes that impossible. I can confirm that rewriting works fine as long as the url has .php at the end. RewriteRule a\.php b\.php Works, while RewriteRule a\.html b\.html does not. How can I turn off this behavior and allow it to rewrite all urls? I'm on a shared host so whatever I do has to be done from a .htaccess file. Update: There seems to be some confusion about what I'm asking here. The question is not about how to write the rule, the question is about server configuration. The rule I'm using is fine, I can test that locally. But the server I'm working with is somehow configured so that mod_rewrite doesn't attempt to rewrite anything that doesn't end with .php

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• Ubuntu 13.10 New keyboard stuff bugged wine games

  - by karapinha

  I have made recently a fresh install of ubuntu 13.10. Since the first day I have problems with keyboard probably because of the new ibus thing... My language is PT-PT. One of those problems is the wrong behaviours on wine. games I was running in ubuntu 13.04 (tomb-raider, Skyrim, Shadow Warrior and Dark Souls) installed in the new ubuntu 13.10 they started to get key stuck when there is a combination like W+D+R (Drifting right + reloading) and its not because of windows/wine problems because the prefixes are the same that I had in 13.04. The key stuck as already been reported on winehq for Skyrim for some one using Linux Mint that was based on the 13.10. Is there a way of making the keyboard work like I was in 13.04? Or can i change the input type? Or downgrade ibus or something like that?

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• Index independent character comparison within text blocks

  - by Michael IV

  I have the following task: developing a program where there is a block of sample text which should be typed by user. Any typos the user does during the test are registered. Basically, I can compare each typed char with the sample char based on caret index position of the input, but there is one significant flaw in such a "naive" approach. If the user typed mistakenly more letters than a whole string has, or inserted more white spaces between the string than should be, then the rest of the comparisons will be wrong because of the index offsets added by the additional wrong insertions. I have thought of designing some kind of parser where each string (or even a char ) is tokenized and the comparisons are made "char-wise" and not "index-wise," but that seems to me like an overkill for such a task. I would like to get a reference to possibly existing algorithms which can be helpful in solving this kind of problem.

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• Should I provide fallbacks for HTML5/CSS3 elements in a web page at this point?

  - by Abluescarab

  I'm wondering if I should bother providing a fallback for HTML5 tags and attributes and CSS3 styling at this point in time. I know that there's probably still a lot of people out there who use older versions of browsers and HTML5/CSS3 are still fairly new. I read this article: Should I use non-standard tags in a HTML page for highlighting words? and one answer mentioned that people kind of "cheat" with older browsers by using the new tags and attributes, but styling them in CSS to ensure they show up right. This question: Relevance of HTML5: Is now the time? was asked about two years ago and I don't know how relevant it is anymore. For example, I want to use the placeholder and required attributes in a web form I'm building and it has no labels to show what each <input> is. How do I handle this, or do I bother?

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• What exactly can shaders be used for?

  - by Bane

  I'm not really a 3D person, and I've only used shaders a little in some Three.js examples, and so far I've got an impression that they are only being used for the graphical part of the equation. Although, the (quite cryptic) Wikipedia article and some other sources lead me to believe that they can be used for more than just graphical effects, ie, to program the GPU (Wikipedia). So, the GPU is still a processor, right? With a larger and a different instruction set for easier and faster vector manipulation, but still a processor. Can I use shaders to make regular programs (provided I've got access to the video memory, which is probable)? Edit: regular programs == "Applications", ie create windows/console programs, or at least have some way of drawing things on the screen, maybe even taking user input.

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• Liskov substitution and abstract classes / strategy pattern

  - by Kolyunya

  I'm trying to follow LSP in practical programming. And I wonder if different constructors of subclasses violate it. It would be great to hear an explanation instead of just yes/no. Thanks much! P.S. If the answer is no, how do I make different strategies with different input without violating LSP? class IStrategy { public: virtual void use() = 0; }; class FooStrategy : public IStrategy { public: FooStrategy(A a, B b) { c = /* some operations with a, b */ } virtual void use() { std::cout << c; } private: C c; }; class BarStrategy : public IStrategy { public: BarStrategy(D d, E e) { f = /* some operations with d, e */ } virtual void use() { std::cout << f; } private: F f; };

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• SQL2K8R2: StreamInsight changes at RTM: Hopping Windows

  - by Greg Low

  We've been working on updating our demos and samples for the RTM changes of StreamInsight. I'll detail these as I come across them. The first is that there is a change to the HoppingWindow. The first two parameters are the same in the constructor but the third parameter is now required. It is the HoppingWindowOutputPolicy. Currently, there is only a single option for this which is ClipToWindowEnd. So you can create a HoppingWindow like this: var queryOutput = from w in input.HoppingWindow ( TimeSpan...(read more)

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• Software, script or a tool to automate managing which tests to run

  - by laggingreflex

  I have a batch file that lists all the test files I have and asks me which test I want to perform, like Test. [U]nit, [I]ntegration : i (user input) Integration. [A]ll, [2][U]serInteraction, [3][R]esultGeneration : u 2 User Interaction. Running "mocha integration\2userint.js" ... So essentially I have configured a batch "option" for each test file I have, which I can choose to run individually or all together. But adding and removing tests is a pain. I have to update the batch file everytime a new file is added or changed. Is there a software, script or a tool, that does this automatically, or makes it easier for me to do so? I basically need it to be aware of and ask me which file(s) I want to test. A GUI with checkboxes would be ultimate! but I'll take anything. I'm working in node.js

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• Automated Post-billing Service/Solution

  - by geoffreak

  I'm trying to find a solution or service that will allow for my company to automatically take a customer's credit card information via the web to keep on file and bill against based on how much they have used the services we provide. We need a service that will also handle the payment processing as well. Note that this is not recurring billing. The bill at the end of each month won't be the same. Presently, we are having to take a customer's credit card information over the phone and manually input it into Quickbooks, but this just doesn't work for scalability. We will still be manually invoicing the customers, but we need automated credit card acceptance and storage without the liabilities involved with storing it on our own server. Solutions that integrate with Wordpress would be a plus.

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• Shortest Common Superstring: find shortest string that contains all given string fragments

  - by occulus

  Given some string fragments, I would like to find the shortest possible single string ("output string") that contains all the fragments. Fragments can overlap each other in the output string. Example: For the string fragments: BCDA AGF ABC The following output string contains all fragments, and was made by naive appending: BCDAAGFABC However this output string is better (shorter), as it employs overlaps: ABCDAGF ^ ABC ^ BCDA ^ AGF I'm looking for algorithms for this problem. It's not absolutely important to find the strictly shortest output string, but the shorter the better. I'm looking for an algorithm better than the obvious naive one that would try appending all permutations of the input fragments and removing overlaps (which would appear to be NP-Complete). I've started work on a solution and it's proving quite interesting; I'd like to see what other people might come up with. I'll add my work-in-progress to this question in a while.

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• Drag Gestures - fractional delta values

  - by Den

  I have an issue with objects moving roughly twice as far as expected when dragging them. I am comparing my application to the standard TouchGestureSample sample from MSDN. For some reason in my application gesture samples have fractional positions and deltas. Both are using same Microsoft.Xna.Framework.Input.Touch.dll, v4.0.30319. I am running both apps using standard Windows Phone Emulator. I am setting my break point immediately after this line of code in a simple Update method: GestureSample gesture = TouchPanel.ReadGesture(); Typical values in my app: Delta = {X:-13.56522 Y:4.166667} Position = {X:184.6956 Y:417.7083} Typical values in sample app: Delta = {X:7 Y:16} Position = {X:497 Y:244} Have anyone seen this issue? Does anyone have any suggestions? Thank you.

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• Java based webservices

  - by java_mouse

  We are working on a big java project and as a second phase in this project, we will have to develop some web services that the clients can call and get or update the data in our database. Though I have been a Java programmer for a while, I have never worked on web services yet. I develop EJBs, data services layer etc but have not worked in web services yet. What are the current standards in developing web services in Java platform? What is the best and recommended way for developing web-services? Any input/link will be appreciated

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• Write a program consisting of a main module and three other modules

  - by user106080

  The owner of a super supermarket would like to have a program that computes the monthly gross pay of their employees as well as the employees’s net pay. The input for this program is the employee id number, hourly rate of pay, and number of regular and overtime hours hours worked. Gross pay is the sum of the wages earnes from regular hours; overtime is 1.5 times the regular rate. Net pay is gross pay hours; overtime is paid at 1.5 times the regular rate. Net pay is the gross pay minus deductions. Assume that deduction are taken for tax withholding (50 percent of gross pay) and parking ($10.00 per month) you will need the following variables: EmployeeID (a string) HourRate is (a float) RegHours (a float) ; GrossPay (a float);Tax (afloat) Parking (a float) OverTimeHours (a float) NetPay (a float) GrossPay = Regularhours* HourRate+OverTimeHours*(HourRate*1.5) NetPay= GrossPay – (GrossPay*Tax) – Parking

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• Keyboard freezes when xorg crashes.

  - by gsedej

  Situation is like that. Many times has happened that Xorg freezes and with it also keyboard. Quite some times because of some Compiz effects or Flash (fullscreen switch). Keyboard becomes totaly unresponsive, while mouse still works (I can move cursor, but can't click since desktop freezes) and music still plays and I can connect trough ssh. This is the only way I know I can try to solve problem - either by killing browser&flash or lastly restarting xorg server. This problem appears on more than one Ubuntu computer. My home dekstop with proprietery nvidia driver, on my work where I use noveau driever (opensource driver for geforce) and sometimes (but rarely) also on laptop with ATI graphics (using r300g driver which is really good!). Can someone explains why mouse still works while I can't input from keyboard? (I can't switch to virtual console or do R-E-I-S-U-B command) I have USB keyboard and USB mouse.

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• Page load speeds effect on crawl rate

  - by Sam Pegler

  We've noticed a big drop in the total pages crawled per day on our site, we have no control over the crawl rate in google webmaster tools so it's possible this has been changed by google. However it's a fairly large site and I wouldn't of thought that the crawl rate would've been decreased. What we have noticed though is a sizeable increase in page load times, in my mind this would be the cause. Can anyone else confirm if the crawl rate is directly correlated to page load time? Seems logical, longer page load time, less pages crawled. Any decent documentation on this would be appreciated, I don't normally have any input on SEO so this is new to me.

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• combo microphone does not work on Natty.

  - by Senthil Kumaran

  I have a Internal Audio Hardware card and my Laptop (Lenevo IdeaPad) presents a single slot as a combo Microphone and headphone jack. On Windows, I attach my ipod headphone to jack and speak directly to my computer. I assume there is a microphone which is listening to my voice and I can communicate two-way. On Ubuntu, the microphone always seem to be listening to random noise. So any input by speaking to the computer is not possible. What could be the reason and how do I troubleshoot this?

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• 2d shapes in XNA 4.0?

  - by Lautaro

  Having some experience of XNA but none of 3D programming. I have an idea i want to realize but i have not decided to do it in 3d or 2d. Im not sure which one will be best in XNA. I want to have a shape like a blob that can reshape depending on input. The morphing does not need to be very advanced. It could be a circle (2d) or globe (3d) that just has one point that moves slightly in a random direction. In ASP.NET i have made this through the 2d Draw classes where i can make lines, circles, squares etc and then modify the points that makes them up. But it seems to me that XNA does not have classes for making 2d shapes (can i get this confirmed?). If it had, then this would be the quickest solution for me.

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• Acer Aspire installation of Ubuntu as the one and only OS

  - by Anthalis

  I am quite sick of a Win7 limited edition that was pre-installed on my Acer Aspire One 533. I want to have Ubuntu as the only OS on this little thing. I have tested Ubuntu on a pretty unstable system and I am simply in love with it, despite the fact that I am still on the learning path. So my questions is how do I format/erase all previous info, including windows files? I am interested in a real cleanup of the drives rather than just a re-partitioning, because I travel every now and then and I want to prevent any personal data remaining on the drives for anyone with recovery knowledge to sniff through. Thanks in advance for your input and advice. A.

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• Handling different screen densities in Android Devices?

  - by DevilWithin

  Well, i know there are plenty of different-sized screens in devices that run Android. The SDK I code with deploys to all major desktop platforms and android. I am aware i must have special cares to handle the different screen sizes and densities, but i just had an idea that would work in theory, and my question is exactly about that method, How could it FAIL ? So, what I do is to have an ortho camera of the same size for all devices, with possible tweaks, but anyway that would grant the proper positioning of all elements in all devices, right? We can assume everything is drawn in OpenGLES and input handling is converted to the proper camera coordinates. If you need me to improve the question, please tell me.

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• unable to mount internal disk mount exited with exit code 13

  - by Masri

  My Ubuntu get into error when I try to mount one of my internal disks and it gives this error message: Error mounting: mount exited with exit code 13: $MFTMirr does not match $MFT (record 3). Failed to mount '/dev/sda7': Input/output error NTFS is either inconsistent, or there is a hardware fault, or it's a SoftRAID/FakeRAID hardware. In the first case run chkdsk /f on Windows then reboot into Windows twice. The usage of the /f parameter is very important! If the device is a SoftRAID/FakeRAID then first activate it and mount a different device under the /dev/mapper/ directory, (e.g. /dev/mapper/nvidia_eahaabcc1). Please see the 'dmraid' documentation for more details. pls advise how to solve above error ,Many thanks to you in advance.

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• Can I use Ubuntu Server to replace our Windows environment?

  - by Aaron English

  I have recently been put in charge of a network overhaul for our company. I have done plenty with Ubuntu in school but it has been a few years. I would like to replace our current servers with Ubuntu, although I am unaware if it will work. Our current environment runs a Domain, Exchange, and VPN. I know there are solutions capable for this. I guess my man worry is will windows 7 and windows XP be able to use Ubuntu as a Domain Controller? If anyone has had success with this I would love some input. I have a meeting in a couple months that I am suppose to explain our plan. Thank you.

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• Howto overlay subtitles onto video using avconv?

  - by hatterman

  I am using the following script to overlay a dvdsub stream and a video stream; avconv -i input.mkv -i subtitles.sub -filter_complex "[0:v:0][1:s:0]overlay[vid]" -map "[vid]" -s hd720 -sws_flags lanczos -vcodec libx264 -crf 20 -preset medium ~/Desktop/test.mkv I get the following error ; Stream specifier ':s:0' in filtergraph description [0:v:0][1:s:0]overlay[vid] matches no streams. No matter what I do I just cannot get this to work. Can any one tell me how to 'burn-in' subtitles using avconv (or ffmpeg) ?

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