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• Faster Matrix Multiplication in C#

  - by Kyle Lahnakoski

  I have as small c# project that involves matrices. I am processing large amounts of data by splitting it into n-length chunks, treating the chucks as vectors, and multiplying by a Vandermonde** matrix. The problem is, depending on the conditions, the size of the chucks and corresponding Vandermonde** matrix can vary. I have a general solution…

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• Python — How can I find the square matrix of a lower triangular numpy matrix? (with a symmetrical upper triangle)

  - by Dana Gray

  I generated a lower triangular matrix, and I want to complete the matrix using the values in the lower triangular matrix to form a square matrix, symmetrical around the diagonal zeros. lower_triangle = numpy.array([ [0,0,0,0], [1,0,0,0], [2,3,0,0], [4,5,6,0]]) I want to generate the following complete matrix, maintaining the zero diagonal: …

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• Objects array with numpy

  - by ki0

  hi there, are there any way to create an object form any class inside a numpy array?. Something like: a = zeros(4) for i in range(4): a[i]=Register() Thanks

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• floating point precision in ruby on rails model validations

  - by Chris Allison

  Hello I am trying to validate a dollar amount using a regex: ^[0-9]+\.[0-9]{2}$ This works fine, but whenever a user submits the form and the dollar amount ends in 0(zero), ruby(or rails?) chops the 0 off. So 500.00 turns into 500.0 thus failing the regex validation. Is there any way to make ruby/rails keep the format entered by the user,…

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• How to update multiple rows with different values in mysql?

  - by user210481

  I have a table with a column 'A'. Some rows have 14 digits for the column 'A' and some have only 12. I need to transform all the entries to 14 digits. The datatype is varchar I would like to update all the rows at once (one query), adding zeros before the first digit, so an entry like 012345678910 would become 00012345678910. Is it…

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• Several numpy arrays with SWIG

  - by Petter

  I am using SWIG to pass numpy arrays from Python to C++ code: %include "numpy.i" %init %{ import_array(); %} %apply (float* INPLACE_ARRAY1, int DIM1) {(float* data, int n)}; class Class { public: void test(float* data, int n) { //... } }; and in Python: c = Class() a = zeros(5) c.test(a) This works, but how can I…

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• JSF trimming white spaces

  - by msharma

  HI, I have an input field in which I want to trim any leading/trailing whitespaces. We are using JSF and binding the input field to a backing bean in the jsp using: <h:inputText id="inputSN" value="#{regBean.inputSN}" maxlength="10"/> My question is that besides validation can this be done in the jsp? I know we can also do…

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• Extract number from string in MSBuild

  - by Ole Lynge

  I would like to extract the number from a string in MSBuild. How can I do that using the built in tasks or the MSBuild.Community.Tasks? (RegexMatch might do, but how?) Example: I have the string agent0076 and I would like to get out the number, without the leading zeros: 76

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• How to add / to the end of a URL using IIS7 Rewite rules

  - by Pbearne

  Hi Guys I need to add a trailing / to a url if it doesn't have one or isn't a file so http://www.ddd.com/dasdas becomes http://www.ddd.com/dasdas/ But I don't what to just add slash the URl as this will end up with filename like this style.css/ So I need a piece of Regex that I can put into the IIS 7 rewrite engeine to append…

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• In what situation should the built-in 'operator' module be used in python?

  - by apphacker

  I'm speaking of this module: http://docs.python.org/library/operator.html From the article: The operator module exports a set of functions implemented in C corresponding to the intrinsic operators of Python. For example, operator.add(x, y) is equivalent to the expression x+y. The function names are those used for…

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• .htaccess mod force extra characters

  - by user1090809

  I need to be able to write/post links on the web that look like 'mysite.com/?d=foo', and take the user to filepath '/foo.php'. Here is my htaccess: RewriteEngine on RewriteBase / RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME}\.php -f RewriteRule ^([^/]+)/$ $1.php [L] RewriteRule ^([^/]+(/[^/]+)*)/$ /$1.php…

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• Convert NSData into Hex NSString

  - by Dawson

  With reference to the following question: Convert NSData into HEX NSSString I have solved the problem using the solution provided by Erik Aigner which is: NSData *data = ...; NSUInteger capacity = [data length] * 2; NSMutableString *stringBuffer = [NSMutableString stringWithCapacity:capacity]; const unsigned char *dataBuffer =…

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• C# Program gets stuck

  - by weirdcsharp

  The program never prints out "test" unless I set a breakpoint on it and step over myself. I don't understand what's happening. Appreciate any help. public partial class Form1 : Form { public Form1() { InitializeComponent(); string testKey = "lkirwf897+22#bbtrm8814z5qq=498j5"; string testIv =…

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• Matlab cell length

  - by AP

  Ok I seem to have got the most of the problem solved, I just need an expert eye to pick my error as I am stuck. I have a file of length [125 X 27] and I want to convert it to a file of length [144 x 27]. Now, I want to replace the missing files (time stamps) rows of zeros. (ideally its a 10 min daily average thus should…

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• Mod Rewrite Rule not matching certain words

  - by Andy Gee

  I'm no expert in mod_rewrite at all and I'm trying to add a condition to the rule below to: match which is not equal to 'share' not match anything with a dot in it RewriteRule ^([^/]*)$ http://domain.com/directory/index.php?key=$1 [L] http://domain.com/directory/share will not be matched (share) …

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• jquery cycle not working/playing in IE7

  - by user202141

  got the jq cycle plugin to work nicely on all the other major browsers, but IE7 just shows the first nested element (an img with a anchor wrapped around it) with no fade/animation. http://alitedesigns.com/ I checked for trailing commas after the custom attributes for cycle, any thoughts on why IE…

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• converting 6 bytes hex string to 8 byte raw data with perl

  - by ron

  How can i convert a hex string lenght 6 bytes for example string ='1122aaccddff'; with perl to raw binary data of lenght 8 byes the last 2 bytes shoul be padded with zeros,

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• When to use \A in regex?

  - by S.Mark

  End of line anchor $ match even there is extra trailing \n in matched string, so we use \Z instead of $ For example ^\w+$ will match the string abcd\n but ^\w+\Z is not How about \A and when to use?

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• Can I avoid a threaded UDP socket in Python dropping data?

  - by 666craig

  First off, I'm new to Python and learning on the job, so be gentle! I'm trying to write a threaded Python app for Windows that reads data from a UDP socket (thread-1), writes it to file (thread-2), and displays the live data (thread-3) to a widget (gtk.Image using a gtk.gdk.pixbuf). I'm using…

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• Objetcs array with numpy

  - by ki0

  hi there, are there any way to create an object form any class inside a numpy array?¿. Something like: a = zeros(4) for i in range(4): a[i]=Register() Thanks

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• How can I delete a newline if it is the last character in a file?

  - by Todd Partridge

  I have some files that I'd like to delete the last newline if it is the last character in a file. 'od -c' shows me that the command I run does write the file with a trailing new line: 0013600 n t > \n I've tried a few tricks with sed but the best I could think of isn't doing the…

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• MySQL 5.1.41 leading zero is deleted

  - by iggnition

  Hello, I have a MySQL database where i want to store phonenumbers among other things. The fieldtype is INT(10) When I try to insert a number starting with a 0, like 0504042858 it's stored like 504042858. This only happens with zeros when the number start with any other number it's stored…

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• How do I turn off automatic saving of a vim file with a ~ suffix

  - by Leonard

  In my environment, I share vim configuration with other developers (and have my own configuration additions as well) in various .vimrc files. Some places in the environment, I edit a file in vim and automagically a copy of that file with a trailing tilde suffix appears. What vim options…

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• Rookie file permissions question

  - by Camran

  What is the ending 'r' for and the leading 'd' for in file permissions on Linux? Example: drwxr-xr-x I know about the user, group, others part, and I know w=write, r=read, x=execute. But I don't know about the leading 'd' and the trailing 'r'. Care to explain? Thanks

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• printf, sprintf print at least two decimal places

  - by philbrowndotcom

  I'm trying to figure out how to use sprintf to print at least two decimal places and no leading zeros. For instance input: 23 23.0 23.5 23.55 23.555 23.0000 output: 23.00 23.00 23.50 23.55 23.555 23.00 any formatting help would be appreciated

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