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• How to apply a force which should not be continuos

  - by sohan

  I have a body which I move with the help of a button,here is what Im doing -(void) step: (ccTime) delta { int steps = 2; CGFloat dt = delta/(CGFloat)steps; for(int i=0; iactiveShapes, &eachShape, nil); cpSpaceHashEach(space-staticShapes, &eachShape, nil); if(MoveBody) { cpFloat movementPadding = 0.1; cpBodyApplyForce(body, cpvmult(ccp( 10, 0), movementPadding), cpvzero); } else cpBodyResetForces(body); } I just want to stop the body moving whenever the condition fails,I am trying to reset all forces to 0 with cpBodyResetForces(body),but this never work,it just keep on moving. can anyone help me how can I stop the body moving?

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• Do bit operations cause programs to run slower?

  - by flashnik

  I'm dealing with a problem which needs to work with a lot of data. Currently its values are represented as an unsigned int. I know that real values do not exceed a limit of 1000. Questions I can use unsigned short to store it. An upside to this is that it'll use less storage space to store the value. Will performance suffer? If I decided to store data as short but all the calling functions use int, it's recognized that I need to convert between these datatypes when storing or extracting values. Will performance suffer? Will the loss in performance be dramatic? If I decided to not use short but just 10 bits packed into an array of unsigned int. What will happen in this case comparing with previous ones?

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• Padding on A nested in LI in DIV does not size div correctly. Suggestions?

  - by Ben Dauphinee

  Tried removing the overflow hidden, but that does not seem to fix it. Suggestions? Relevent HTML and problem illustration here: http://mgc.selfip.com/bugscreen01.jpg Relevent CSS #nav{padding: 5px 0px; overflow: hidden; background-color: #7af;} ul#nav{white-space: nowrap;} #nav li{display: inline; list-style-type: none;} #nav li a{padding: 5px 10px;} #nav a{font-family: "Adobe Caslon Pro", "Hoefler Text", Georgia, Garamond, Times, serif; font-size: 14pt; font-variant: small-caps;} #nav a:link, #nav a:visited{color: #fff; text-decoration: none;} #nav a:hover, #nav a:focus{color: #fff; background: #91db24;}

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• Address of instruction causing SIGSEGV in external program

  - by karramba

  I want to get address of instruction that causes external program to SIGSEGV. I tried using ptrace for this, but I'm getting EIP from kernel space (probably default signal handler?). How GDB is able to get the correct EIP? Is there a way to make GDB provide this information using some API? edit: I don't have sources of the program, only binary executable. I need automation, so I can't simply use "run", "info registers" in GDB. I want to implement "info registers" in my own mini-debugger :)

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• How to communicate with Telecom infrastructure using .NET

  - by Raiford

  I am currently writing some pretty gnarly C#/C++/Cli code to interface with Telecommunication equipement and GSM Mobile Networks for a couple of the major telecom here and abroad. GSM networks primarily use SS7 Signaling using a protocol called TCAP to send messages back and forth to Signaling Points within the network. The laws of Tcp/ip do not apply here :) I am very interested in hearing from others in this space specifically individuals using the .NET framework most likely using C# / C++. I have not come across any .NET libraries or tools to assist in this sort of development. Most of the software in this industry is "C" / Java based, as a result I have written tons of infrastructure .NET code using C# where possible and C++ / CLI to interface with hardware. Is anyone aware of any .NET language tools for this niche industry?

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• Read a file with 2048 bytes

  - by Suresh S

  Guys i have a file which has only one line. The file has no encoding it is a simple text file with single line. For every 2048 byte in a line , there is new record of 151 byte (totally 13*151 byte = 1945 records + 85 byte empty space). similarly for the next 2048 bytes. What is the best file i/o to use? i am thinking of reading 2048 bytes from file and storing it in an array . while (offset < fileLength &&(numRead=in.read(recordChunks, offset,alength)) >= 0) { } how can i get from the read statement only 2048 bytes at a time . i am getting IndexOutofBoundException.

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• Losing scope for DataContex using LINQToSQL intermediately

  - by greektreat

  I am having a weird Situation with my DataConext. All My code is in C# I have a DLL project for my data access layer and business Layer which and Winforms project for my UI layer. My Data access Layer's Namespace is xxx.Data this is where have my xxx.dbml I also have xxx.Data.BusinessObjects name space of course for my business object in that project In my UI Layer I have these namespaces xxxApp(for Forms), xxxApp.Controls (For Controls) I have lost scope of the DataContext, it was accessible now when I do a Rebuild Solution I sometimes get compile errors saying for example: Error 34 'xxx.Data.xxxDataContext' does not contain a definition for 'SubmitChanges' and no extension method 'SubmitChanges' accepting a first argument of type 'xxx.Data.xxxDataContext' could be found (are you missing a using directive or an assembly reference?) Also intelisense doesn't recognize the methods and table classes from my xxxDataContext anymore I can access all object fine when I am in the DLL project but now in the Winforms project this is very strange. If anyone can help me out I would be extremely grateful!

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• Multiple calls to /dev/stdin using python subprocess (*nix)

  - by Alex Leach

  Hi, I have a python subprocess call which I would like to link up to three pipes (two standard in and one standard out). I know that there is only one /dev/stdin, but there's all those other devices in /dev I don't know about, and don't know of any python os, sys or subprocess modules that will utilise them in a manner which allows me to give the device path to subprocess.Popen. The reason I ask is because I would like to pipe information from a mysql database or tar archive rather than a directory structure I currently have which has 28,000 directories in. The directory names alone uses a LOT of space! The alternative is to tar / gunzip the entire directory structure and manoeuvre through the compressed archive. With either solution, mysql or tar, I would still like to have two pipes into subprocess.Popen and one out, so that I can bypass the HDD. Any need for an example??

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• WPF: how to make normal listbox left-drag-select behavior use middle mouse instead?

  - by Scott Bilas

  I'm building a special listbox control that our designers want customized in some tweaky ways. One thing they want to see is that the middle button-drag does what the left button-drag normally does (we are repurposing left-drag to other things). So it needs the two key features that left-drag does in a ListBox default implementation: While holding down the button and dragging, the selection starts where I click down and extends to where I drag. While dragging outside the listbox region, it scrolls if there is scrollable space in that direction. Before I go an duplicate this functionality by hand, is there any easy way to fool ListBox into thinking it's getting left-mouse drag events but instead is getting middle-mouse?

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• How do I use grep to extract a specific field value from lines

  - by Stormshadow

  I have lines in a file which look like the following ....... DisplayName="john" .......... where .... represents variable number of other fields. Using the following grep command, I am able to extract all the lines which have a valid 'DisplayName' field grep DisplayName="[0-9A-Za-z[:space:]]*" e:\test However, I wish to extract just the name (ie "john") from each line instead of the whole line which is returned by grep. I tried pipelining the output to the cut command but it does not accept string delimiters.

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• measuring uncertainty in matlabs svmclassify

  - by Mark

  I'm doing contextual object recognition and I need a prior for my observations. e.g. this space was labeled "dog", what's the probability that it was labeled correctly? Do you know if matlabs svmclassify has an argument to return this level of certainty with it's classification? If not, matlabs svm has the following structures in it: SVM = SupportVectors: [11x124 single] Alpha: [11x1 double] Bias: 0.0915 KernelFunction: @linear_kernel KernelFunctionArgs: {} GroupNames: {11x1 cell} SupportVectorIndices: [11x1 double] ScaleData: [1x1 struct] FigureHandles: [] Can you think of any ways to compute a good measure of uncertainty from these? (Which support vector to use?) Papers/articles explaining uncertainty in SVMs welcome. More in depth explanations of matlabs SVM are also welcome. If you can't do it this way, can you think of any other libraries with SVMs that have this measure of uncertainty?

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• When is it useful to define your own delegates instead of using the generics?

  - by Carlos

  I've been going through some old code, where I came across some custom defined delegates, which are used thus: private delegate void ListenDelegate(UdpClient listener, bool multicast); private void ListenOn(UdpClient listener, bool multicast) { new ListenDelegate(_ListenLoop).BeginInvoke(listener, multicast, null, null); } With some of the new .NET framework versions, you can do the following: private void ListenOn(UdpClient listener, bool multicast) { new Action<UdpClient, bool>(_ListenLoop).BeginInvoke(listener, multicast, null, null); } This ought to be exactly the same. Is there any point in defining your own delegates, when the generic delegates seem to do the same job with less space? Or have I missed something about the generics that makes them not equivalent?

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• loading Data in VBA from a text file

  - by omegayen

  I am not very familiar with VBA but need to use it for a new software program I am using (not Microsoft related) I have a text file that has columns of data I would like to read into VBA. Specifically the text file has 4 entries per row. Thus I would like to load in the column vectors (N by 1). The text file is separated by a space between each entry. So for example I want to load in column one and save it as array A, then column two and save as array B, then column three and save as array C, and then column four and save as array D. This code snippet found below from http://www.tek-tips.com/faqs.cfm?fid=482 is something I found that can load in text to an array, but I need to adapt it to be able to save the columns as different arrays as specified above... Open "MyFile.txt" For Input As #1 ReDim Txt$(0) Do While Not EOF(1) ReDim Preserve Txt$(UBound(Txt$) + 1) Input #1, Txt$(UBound(Txt$)) Loop Close #1

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• How to use Mysql variables with Hibernate ?

  - by Jerome C.

  Hello, I need to use a native sql query in Hibernate with use of variable. But hibernate throws an error saying: Space is not allowed after parameter prefix So there is a conflict with the := mysql variable assignment and hibernate variable assignment. Here is my sql query: SET @rank:=0; UPDATE Rank SET rank_Level=@rank:=@rank+1 ORDER BY Level; I can't use a stored procedure because my sql query is dynamically generated ('Level' can be 'int' or 'force'...) How can I do this ? thanks

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• Merging contents of two lists based on a if-loop

  - by chavanak

  I have a minor problem while checking for elements in a list: I have two files with contents something like this file 1: file2: 47 358 47 48 450 49 49 56 50 I parsed both files into two lists and used the following code to check for i in file_1: for j in file_2: j = j.split() if i == j[1]: x=' '.join(j) I am now trying to get a "0" if the value of file_1 is not there in file_2 for example, value "48" is not there is file_2 so I need to get the output like (with only one space in between the two numbers): output_file: 358 47 0 48 450 49 56 50 I tried using the dictionary approach but I didn't quite get what I wanted (actually I don't know how to use dictionary in python correctly ;)). Any help will be great.

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• Jquery ajax call with '+' sign.

  - by 0plus1

  Hi, I'm doing this: $.ajax({ type: "POST", url: baseURL+"sys/formTipi_azioni",data:"az_tipo="+azione, beforeSend: function(){$("#form").html('<p><img src="'+baseURL+'lib/img/ajax-loader.gif" width="16" height="16" alt="loading" /><p>');}, success: function(html){$("#form").html(html);} }); there is a case when azione is TB+ the plus sign doesn't get POSTed at all, a blank space get sent. I already tried this: azione = escape(String(azione)); With no luck. Does anybody knows how to fix this? Thank you

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• document class problem in latex

  - by laspal

  Hi, My problem is my full tables and text are coming some says 15 cm away from left side, so my text has very less space on right side says 3cm. How can I change my text and tables to start from 5 cm awayfrom left and 5 cm before right side. What all \documentclass[] {} can I try to change this format. \documentclass[a4paper]{article} \usepackage{graphics} \usepackage{color} \usepackage{hyperref} \usepackage{multirow} \usepackage{longtable} \usepackage{fullpage} \usepackage[pdftex]{graphicx} \usepackage{fancyhdr} \oddsidemargin 0cm \evensidemargin 0cm \pagestyle{fancy} \renewcommand{\headrulewidth}{0.0pt} \lfoot{%(full_name)s/%(emp_id)s/\thepage} \cfoot{} \topmargin -2.5cm \parindent 0cm \textheight 27.5cm \parskip 3mm \begin{document} \fontencoding{\encodingdefault} \renewcommand{\familydefault}{\sfdefault} \fontshape{\shapedefault} \selectfont Thanks

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• how to convert numbers to alpha numeric system with php

  - by Patrick

  Im not sure what this is called, which is why im having trouble searching for it. What im looking to do, is take numbers, and convert them to some alpha numeric base so that the number say 5000, wouldnt read 5000, but like G4u or something like that. The idea being to save space and also not make it obvious how many records there are in a given system. Im using php, so if there is something like this built into php even better, but even a name for this method would be helpful at this point Again, sorry for not being able to be more clear, im just not sure what this is called.

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• efficient video format/codec for sparse & binary blob tracking

  - by user391339

  I am working on a blob tracking project and have many high-definition videos that I would like to reduce in size for storage and downstream tracking/shape-analysis. I want to use a lossless method that takes advantage of the black and white nature of the video as well as the fact that not much is moving between individual frames. The videos are quite sparse, with 5 to 10 b&w blobs per frame occupying <30% of the space in total, with each blob moving <5-10% of the field of view between frames and not changing shape too much between 2-3 frames. I will work in Python, Matlab, or LabView for this project, and could use a batch utility if available. It may be worthwhile to export the files as compressed image stacks if a proper video format can't be found. What are the pros and cons of this? A video codec uses correlations between neighboring frames, so it should be more efficient, but not if the wrong one is chosen or if it is improperly configured.

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• Which libraries use the "We Know Where You Live" optimization for std::make_shared?

  - by KnowItAllWannabe

  Over two years ago, Stephan T. Lavavej described a space-saving optimization he implemented in Microsoft's implementation of std::make_shared, and I know from speaking with him that Microsoft has nothing against other library implementations adopting this optimization. If you know for sure whether other libraries (e.g., for Gnu C++, Clang, Intel C++, plus Boost (for boost::make_shared)) have adopted this implementation, please contribute an answer. I don't have ready access to that many make_shared implementations, nor am I wild about digging into the bowels of the ones I have to see if they've implemented the WKWYL optimization, but I'm hoping that SO readers know the answers for some libraries off-hand. I know from looking at the code that as of Boost 1.52, the WKWYL optimization had not been implemented, but Boost is now up to version 1.55. Note that this optimization is different from std::make_shared's ability to avoid a dedicated heap allocation for the reference count used by std::shared_ptr. For a discussion of the difference between WKWYL and that optimication, consult this question.

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• Embedded Google Earth Plug-Ins no longer working

  - by user1497162

  I really hope someone can help me. I just noticed that none of my website's Google Earth embedded plug-in's work anymore (in Safari, Chrome or Firefox)  All you can see now is blank space and small text that says "Information is temporarily unavailable." I have no idea why they would no longer be working.  Nothing has changed whatsoever. Example here: http://www.grandcanyonvirtualtour.com/_tours/phantom_ranch.html Any suggestions greatly appreciated!! Please note, I am not a coder -- I am a photographer who is learning how to integrate photographs into maps, so I apologize if any questions are elementary. Thanks, Sara I am on a MacBook Pro 2.4 GHz Intel Core i7; OS 10.7.4

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• wpf app invisible remotely (via radmin)

  - by SteveCav

  hi gang, I've built a little WPF utility that watches a serialport and visualises monitoring information with WPF. It works fine, but a colleague just tried using it from another machine via radmin and my app is completely invisible! if you're at the machine you see it, if you view it via radmin you see the same screen but no app. Instead you see the app behind it (in this case windows explorer), but can't click on anything in the space where my app is. Has anyone else come across this before??

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• Looking for ideas on automatically arranging a set of objects (furniture) in a virtual room in AS3

  - by raf

  First of all, I don't want to visually arrange 3D models dragging them with the mouse, all I want is: Given a room of certain dimensions (L,W,H) and given a set of elements like beds, chairs, etc (with L,W,H dimensions, of course) I want to automatically arrange those elements to take advantage of the space as much as I can. So I want to be able to put as much furniture as I can in a given room. At the end I need to represent the arranged items visually, inside the room. My first thought was to use an array of items and sorting it with array.sortOn(["l","w","h"] Array.NUMERIC) and then define a gap between the objects and make the maths to put the objects one next to another, etc. but that isn't a good approach because some items may be placed on top of another ones (boxes of the same size, boxes on top of tables, etc). I really don't have experience on 3D programming, that's why I'm asking for help. Thanks in advance.

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• How to set the component size with GridLayout? Is there a better way?

  - by Blackbam

  Hello guys, I am working on a larger GUI with Java and I am becoming angry on Layout Managers. I have a "Settings-Panel" with a variable number of JComponents in it (Labels, Buttons, JSpinners, JSliders,...). I just want the following: JLabel <- JComponent JLabel <- JComponent JLabel <- JComponent ... My Panel has a size of 500px, so that there is enough space for a lot of components. Unfortunatly the GridLayout always stretches the size of the Components to the whole Panel, even if I set a MaximumSize for every component. It looks stupid if there are only two buttons each with a height of 250px. I tried flow Layout, but i cannot figure out a way to make new lines properly. I tried BoxLayout.Y_AXIS, but the Components are always centered, and Label and Component are not in the same line. Does anybody know a good and short way with LayoutManagers to handle this properly?

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• Format table header

  - by Ryan Erb

  I have a table with slanted text in the header row, the only problem is that the text still makes the width of the columns way to large. Is there any way to squish together the table columns so that they are about the width of the select boxes? Or is there a way to place the text there without it in the header and maybe just use a <div> or <p>? Here is the fiddle I am working with: http://jsfiddle.net/t9Krg/1/ .slanted { -webkit-transform: rotate(-45deg); -moz-transform: rotate(-45deg); -ms-transform: rotate(-45deg); -o-transform: rotate(-45deg); transform: rotate(-45deg); white-space:nowrap; /* display:noblock; */ } The boarders around the header is just to see the extra spacing and will be removed later.

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