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  • two's complement, why the name "two"

    - by lenatis
    i know unsigned,two's complement, ones' complement and sign magnitude, and the difference between these, but what i'm curious about is: why it's called two's(or ones') complement, so is there a more generalize N's complement? in which way did these genius deduce such a natural way to represent negative numbers?

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  • Tetris Piece Rotation Algorithm

    - by coppercoder
    What are the best algorithms (and explanations) for representing and rotating the pieces of a tetris game? I always find the piece rotation and representation schemes confusing. Most tetris games seem to use a naive "remake the array of blocks" at each rotation: http://www.codeplex.com/Project/ProjectDirectory.aspx?ProjectSearchText=tetris However, some use pre-built encoded numbers and bit shifting to represent each piece: http://www.codeplex.com/wintris Is there a method to do this using mathematics (not sure that would work on a cell based board)?

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  • Simplest Algorithm for 2D Interpolation

    - by Gayan
    I have two shapes which are cross sections of a channel. I want to calculate the cross section of an intermediate point between the two defined points. What's the simplest algorithm to use in this situation? P.S. I came across several algorithms like natural neighbor and poisson which seemed complex. I'm looking for a simple solution which could be implemented quickly

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  • How to make an inner shadow effect on big font using CSS text-shadow?

    - by Relax
    I want to make the effect as demonstrate on this site http://dropshadow.webvex.limebits.com/ with arguments - left:0 top:0 blur:1 opacity:1 examples:engraved font:sans serif I tried #333333 -1px -1px but seems not enough to make an inner shadow on such big font, it may be much more complex than i thought? And worse is i'm using Cufon to replace the font but Cufon doesn't support blur of text-shadow

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  • Most mind-blowing C# hack you’ve ever seen?

    - by sblom
    In the same spirit as the "Hidden features of X?" series, what are the most mind-blowingly well-executed "I didn't even think the language could do that!" hacks that you've ever seen in C#. For example, a favorite of mine from a while ago is a full ray tracer implemented in a single (complex) LINQ statement. (Note: this is a community wiki question to avoid the appearance of reputation-whoring.)

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  • 4096 MiB SD card in Android Emulator... less than 9MB?

    - by Izhido
    Every time I attempt to create a new AVD with the latest Android SDK (under Eclipse), I can't actually specify SD Card Sizes greater than 1024 MiB. Any attempt to specify higher numbers gets me always the same message: "SD Card Size must be at least 9MB" What gives? Any idea why this could be happening?

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  • Best way to get ints from a string with whitespace?

    - by befall
    Hey all, I know this is simple, I just can't recall the best way to do this. I have an input like " 5 15 " that defines the x and y of a 2D vector array. I simply need those two numbers into int col and int row. What's the best way to do this? I was attemping stringstreams, but can't figure out the correct code. Thanks for any help!

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  • Alternative for my preg_replace code

    - by Ben Sinclair
    Here is my code... basically it finds any page-NUMBER- within a variable and then replaces it with a page url from an array $content_text = preg_replace("/page-(\d+)-/sie", '$pageurl[$1]', $content_text); It works a treat until the NUMBER it finds isn't in the array and it returns an error... Is there another efficient way I could do this instead? I liked my code above because it was simple but I may have to use more complex code...

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  • trying to find the comment hook I need for wordpress?

    - by beagleguy
    hi all , I'm writing a wordpress plugin that will execute a certain function when a user submits a comment. The only issue is I'm using the hook "comment_post" which works but if that comment gets stopped by akismet I'm still logging that comment but now my numbers are off from what's on the actual site. Is there a comment_approved type hook I should be using instead? thanks!

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  • Embed pdb into assembly

    - by Konstantin
    Hi! I want my application to be distributable as a single .exe file but I want to be able to get nice error reports with source code line numbers (the application simply sends email with exception.ToString() and some additional information when unhandled exception occurs). Is there any way to embed .pdb into assembly?

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  • Format all elements of a list

    - by Curious2learn
    I want to print a list of numbers, but I want to format each member of the list before it is printed. For example, theList=[1.343465432, 7.423334343, 6.967997797, 4.5522577] I want the following output printed given the above list as an input: [1.34, 7.42, 6.97, 4.55] For any one member of the list, I know I can format it by using, print "%.2f" % member Is there a command/function that can do this for the whole list. I can write one, but was wondering if one already exists. Thanks.

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  • WPF TextBox DataBind on EnterKey press

    - by Jobi Joy
    The default DataBinding on TextBox is TwoWay and it commits the text to the Property only when TextBox lost its focus. Is there any easy XAML way exists to make the DataBinding Happens when I press Enter Key on the TextBox?. I know it is pretty easy to do in the code behind, but imagine if this textBox is inside some complex DataTemplate.

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  • XMLRPC Response Using ws-xmlrpc

    - by Dave
    Anyone have experience parsing complex response types using ws-xmlrpc? The service returns a HashMap with one of the values an Array, when I request the key of the array from the hashmap, java just returns "java.lang.Object". How do I access the contents of the array? Any ideas? Thanks in advance for your input.

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  • Running response time tests on php code - how much is 7.2E-5 microseconds?

    - by Ali
    Hi guys I'm using microtime() function of php to tell how long certain snippets of code take to run I do this by taking the time before and after the snippet and subtracting them using microtime function. I got the following results though for the different snippets: 1 - 0.022976 2 - 0.003656 3 - -0.196361 4- 0.006563 5- 7.2E-5 6- 0.847695 7- 0.005092 8- 7.6E-5 9- 0.08024 The first numbers represent the snippt and the following the time taken... I've forgotten whatever I learnt back in College on numerical methods :( - how big is 7.2E-5 microseconds?

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  • "SpeakHere" iPhone Sample App

    - by Biranchi
    Hi All, Why does Apple has given such complex code in the documentation as Sample code for reference ??? I have wasted too much time in finding out how "averagePowerForChannel" works, but still no good. Where can i find good simple sample codes ??

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  • Decimal point issue on cocoa app

    - by Manuel Rocha
    I there, I'm trying making my first cocoa app, but I'm having problems with float numbers because of the regional settings. If I write on the TextBox the float number 1.2 I only can get the number 1, but If I write on the same TextBox the same float number but this time with the ',' sign instead (1,2) I can get the right float value. How can I bypass the regional settings? Kind Regards, Manuel Rocha

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  • dynamic programming [closed]

    - by shruti
    the input to this problem is a sequence S of integers(not necessarily positive). the problem is to find consecutive subsequence of S with maximum sum using dynamic programming. consecutive means that you are not allowed to skip numbers. for example: if the input was 12,-14,1,23,-6,22,-34,-13. the output would be 1,23,-6,22.

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  • Server side Xforms form validation and integration into ASP.NET

    - by Nigel
    I have recently been investigating methods of creating web-based forms for an ASP.NET web application that can be edited and managed at runtime. For example an administrator might wish to add a new validation rule or a new set of fields. The holy grail would provide a means of specifying a form along with (potentially very complex) arbitrary validation rules, and allocation of data sources for each field. The specification would then be used to update the deployed form in the web application which would then validate submissions both on the client side and on the server side. My investigations led me to Xforms and a number of technologies that support it. One solution appears to be IBM Lotus Forms, but this requires a very large investment in terms of infrastructure, which makes it infeasible, although the forms designer may be useful as a stand-alone tool for creating the forms. I have also discounted browser plug-ins as the form must be publicly visible and cross-browser compliant. I have noticed that there are numerous javascript libraries that provide client side implementations given an Xforms schema. These would provide a partial solution but server side validation is still a requirement. Another option seems to involve the use of server side solutions such as the Java application Orbeon. Orbeon provides a tool for specifying the forms (although not as rich as Lotus Forms Designer), but the most interesting point is that it can translate an XForms schema into an XHTML form complete with validation. The fact that it is written in Java is not a big problem if it is possible to integrate with the existing ASP.NET application. So my question is whether anyone has done this before. It sounds like a problem that should have been solved but is inherently very complex. It seems possible to use an off-the-shelf tool to design the form and export it to an Xforms schema and xhtml form, and it seems possible to take that xforms schema and form and publish it using a client side library. What seems to be difficult is providing a means of validating the form submission on the server side and integrating the process nicely with .NET (although it seems the .NET community doesn't involve themselves with XForms; please correct me if I'm wrong on this count). I would be more than happy if a product provided something simple like a web service that could validate a submission against a schema. Maybe Orbeon does this but I'd be grateful if somebody in the know could point me in the right direction before I research it further. Many thanks.

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  • How to validate integer and float input in asp.net textbox

    - by Rajesh Rolen- DotNet Developer
    I am using below code to validate interger and float in asp.net but if i not enter decimal than it give me error <asp:TextBox ID="txtAjaxFloat" runat="server" /> <cc1:FilteredTextBoxExtender ID="FilteredTextBoxExtender1" TargetControlID="txtAjaxFloat" FilterType="Custom, numbers" ValidChars="." runat="server" /> i have this regex also but its giving validation error if i enters only one value after decimal.. http://stackoverflow.com/questions/617826/whats-a-c-regular-expression-thatll-validate-currency-float-or-integer

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  • Retrieve sequence of data from different columns.

    - by janetsmith
    Let's say I have a table containing following data: | id | t0 | t1 | t2 | | 1 | 4 | 5 | 6 | | 2 | 3 | 3 | 2 | | 3 | 6 | 4 | 5 | | 4 | 4 | 5 | 5 | I want to retrieve all the rows containing 4, 5, 6 (regardless the position of numbers in the tables), so row 1 & row 3 will be selected. How to do that with SQL query?

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  • Float PPM image file format?

    - by Luca
    I've found a PPM image with the header starting with PF. The resolution number is stored in floating point (-1.000). No comments are inserted to get how it was produced. From the resolution, each pixel is composed by 12 bytes (4 bytes per component)... I suppose they are float or integer numbers. The problem is that I cannot get a clear image. Someone has already found this kind of images?

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