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  • Speed up math code in C# by writing a C dll?

    - by Projectile Fish
    I have a very large nested for loop in which some multiplications and additions are performed on floating point numbers. for (int i = 0; i < length1; i++) { s = GetS(i); c = GetC(i); for(int j = 0; j < length2; j++) { double oldU = u[j]; u[j] = c * oldU + s * omega[i][j]; omega[i][j] = c * omega[i][j] - s * oldU; } } This loop is taking up the majority of my processing time and is a bottleneck. Would I be likely to see any speed improvements if I rewrite this loop in C and interface to it from C#?

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  • How to reset lstset settings for listings?

    - by drittesbinom
    At the top of my tex document, I set my sourcecode listing format by \lstset{language=java} \lstset{numbers=left, numberstyle=\tiny, numbersep=5pt, breaklines=true} \lstset{emph={square}, emphstyle=\color{red}, emph={[2]root,base}, emphstyle={[2]\color{blue}}} because I merely list Java source code. At one point in my document, I had to reformat for a single listing by \lstset{commentstyle=\footnotesize\textit} \lstset{basicstyle=\ttfamily\fontsize{11}{12}\selectfont} \lstset{literate= {!=} {$\neq$}{2}} Now I have the problem that my previous Java formatting for listings is destroyed, and I dont know how to reset the lst settings to default. How can this be avoided?

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  • How can I convert Perl regular expressions to boost regular expressions?

    - by YY
    I'm not familiar with Perl and boost regular expression and I want to convert a Perl code to c++. I want to convert special regular expression in Perl into c++ using Boost regexp library. Please help me understand what I must do? Here is some regexps that a word of a sentence may match: if ($word =~ /^[\.:\,()\'\`-]/) { # hack for punctuation } if ($word =~ /^[A-Z]/) { return; } if ($word =~ /[A-Za-z0-9]+\-[A-Za-z0-9]+/) { # all hyphenated words return; } if ($word =~ /.*[0-9].*/) { # all numbers return; }

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  • TFS: Managing assembly version number?

    - by TomTom
    Hello, any good approach for managing assembly version numbers in TFS, possibly together with using the same number for the build number? I would be most interested in an approach that: Maintains the first three elements of the version Counts the rest upward for every "official" build (i.e. a build originating from certain templates only - no need to count up for something like a gated checkin, but the following regular integration build SHOULD count up. Labels the builds, so that a manual "release" build can be triggered. Any solution? How are other people handling this? Right now the (new) TFS is happily building with the same assembly version all around ;) Something coding the complete assembly version with date etc. is not acceptable - I want that number to "follow rules", and having the date in there is not one of them ;)

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  • imagecopyresampled to resize and crop an image - not returning the expected result

    - by David
    imagecopyresized ( resource $dst_image , resource $src_image , int $dst_x , int $dst_y , int $src_x , int $src_y , int $dst_w , int $dst_h , int $src_w , int $src_h ) This is what I want to do: I have an image that's 600x1000px in size, and I want to create a thumb that's 100x100px after resizing that image to 300x500px, the x coordinate for the top left point of the thumb square should be at 100(src x) and 120(src y). According to what I understand from the manual, the command should be $dst_image = imagecreatetruecolor(100,100); $src_image = imagecreatefromjpeg('/home/sandbox/imagetoresize.jpg'); imagecopyresized ($dst_image, $src_image, 0, 0, 100, 120, **300 , 500 , 600 , 1000** ) It is cropping the image just fine, but it isn't resizing it correctly. I never got it to match what I see in my image editor (the GIMP). What am I doing wrong? I confirmed that all the numbers are correct, but it's always shifted up or down no matter what I do. Your help would really be appreciated!

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  • Unique serial number in a java web application.

    - by Zenzen
    I've been wondering what's the correct practice for generating unique ids? The thing is in my web app I'll have a plugin system, when a user registers a plugin I want to generate a unique serial ID for it. I've been thinking about storing all numbers in a DB or a file on the server, generating a random number and checking whether it already exists in the DB/file, but that doesn't seem that good. Are there other ways to do it? Would using the UUID be the preferred way to go?

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  • Script Speed vs Memory Usage

    - by Doug Neiner
    I am working on an image generation script in PHP and have gotten it working two ways. One way is slow but uses a limited amount of memory, the second is much faster, but uses 6x the memory . There is no leakage in either script (as far as I can tell). In a limited benchmark, here is how they performed: -------------------------------------------- METHOD | TOTAL TIME | PEAK MEMORY | IMAGES -------------------------------------------- One | 65.626 | 540,036 | 200 Two | 20.207 | 3,269,600 | 200 -------------------------------------------- And here is the average of the previous numbers (if you don't want to do your own math): -------------------------------------------- METHOD | TOTAL TIME | PEAK MEMORY | IMAGES -------------------------------------------- One | 0.328 | 540,036 | 1 Two | 0.101 | 3,269,600 | 1 -------------------------------------------- Which method should I use and why? I anticipate this being used by a high volume of users, with each user making 10-20 requests to this script during a normal visit. I am leaning toward the faster method because though it uses more memory, it is for a 1/3 of the time and would reduce the number of concurrent requests.

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  • How to join nearly identical several queries into one?

    - by Devyn
    Hi, Assume I have an order_dummy table where order_dummy_id, order_id, user_id, book_id, author_id are stored. You may complain the logic of my table but I somehow need to do it that way. I want to execute following queries. SELECT * FROM order_dummy WHERE order_id = 1 AND user_id = 1 AND book_id = 1 ORDER BY `order_dummy_id` DESC LIMIT 1 SELECT * FROM order_dummy WHERE order_id = 1 AND user_id = 1 AND book_id = 2 ORDER BY `order_dummy_id` DESC LIMIT 1 SELECT * FROM order_dummy WHERE order_id = 1 AND user_id = 1 AND book_id = 3 ORDER BY `order_dummy_id` DESC LIMIT 1 Please keep in mind that several numbers of same book is included in one order. Therefore, I list order_dummy_id by descending and limit 1 so only LATEST ORDER of A BOOK is shown. But my goal is to show other books in that way in one table. I used group by like this ... SELECT * FROM order_dummy WHERE order_id = 1 AND user_id = 1 GROUP BY book_id but it only shows order_dummy_id with ascending result. I have no idea anymore. Looking forward your kindness help!

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  • Best Practice: Software Versioning

    - by Sebi
    I couldn't find a similar question here on SO, but if you find one please link. Is there any guideline or standard best practice how to version a software you develop in your spare time for fun, but nevertheless will be used by some people? I think it's necessary to version such software so that you know about with version one is talking about (e.g. for bug fixing, support, and so on). But where do I start the versioning? 0.0.0? or 0.0? And then how to I increment the numbers? major release.minor change? and should'nt any commit to a version control system be another version? or is this only for versions which are used in a productive manner?

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  • to get columns from Excel files using Apache POI??

    - by posdef
    Hi, In order to do some statistical analysis I need to extract values in a column of an Excel sheet. I have been using the Apache POI package to read from Excel files, and it works fine when one needs to iterate over rows. However I couldn't find anything about getting columns neither in the API (link text) nor through google searching. As I need to get max and min values of different columns and generate random numbers using these values, so without picking up individual columns, the only other option is to iterate over rows and columns to get the values and compare one by one, which doesn't sound all that time-efficient. Any ideas on how to tackle this problem? Thanks,

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  • Solution to combine two submit buttons.. doing two different things from the same input

    - by zac
    I am trying to figure out how to combine two different forms, both require the same input but they do two different things. One form sends a request to the ecommerce platform to get the order status, and another form takes the same order number and returns a tracking code from USP or USPS. I am looking for some guidance on how I could combine these two actions.. one is currently using the POST method and the other GET. Here is an example .. so one is This one runs a validation script to confirm the order number is valid and then returns the order info if it is the second form is sending a get request to an asp file that is generating the proper tracking numbers. Can someone please point me to how I could begin to tackle this?

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  • filtering elements from list of lists in Python?

    - by user248237
    I want to filter elements from a list of lists, and iterate over the elements of each element using a lambda. For example, given the list: a = [[1,2,3],[4,5,6]] suppose that I want to keep only elements where the sum of the list is greater than N. I tried writing: filter(lambda x, y, z: x + y + z >= N, a) but I get the error: <lambda>() takes exactly 3 arguments (1 given) How can I iterate while assigning values of each element to x, y, and z? Something like zip, but for arbitrarily long lists. thanks, p.s. I know I can write this using: filter(lambda x: sum(x)..., a) but that's not the point, imagine that these were not numbers but arbitrary elements and I wanted to assign their values to variable names.

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  • C# public partial struct methods for more System.Windows.Media.Color

    - by dr d b karron
    How can I put in additional methods for manipulating color ? Best would be to overload the struct System.Windows.Media.Color. It is NOT a class (in c#). Now i'm tinkering with putting (in the same file for testing or must i put it in a different file) an namespace (Silverlight Application36 or System.Windows.Media ?) and a partial struct Color Normalize (double R, ...). I should see MyColor.Normalize() start being recognized by intellisense ? I'm not. I'm looking to put in a suite of overloaded color manipulations using floating and double numbers instead of unsigned byte integers. Any hints while I wack at it ? Cheers! dr.K

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  • Prolog: using the sort/2 predicate

    - by Øyvind Hauge
    So I'm trying to get rid of the wrapper clause by using the sort library predicate directly inside split. What split does is just generating a list of numbers from a list that looks like this: [1:2,3:2,4:6] ---split-- [1,2,3,2,4,6]. But the generated list contains duplicates, and I don't want that, so I'm using the wrapper to combine split and sort, which then generates the desired result: [1,2,3,4,6]. I'd really like to get rid of the wrapper and just use sort within split, however I keep getting "ERROR: sort/2: Arguments are not sufficiently instantiated." Any ideas? Thanks :) split([],[]). split([H1:H2|T],[H1,H2|NT]) :- split(T,NT). wrapper(L,Processed) :- split(L,L2), sort(L2,Processed).

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  • Perl : localtime with print

    - by kiruthika
    Hi all, I have used the following statements to get the current time. print "$query executed successfully at ",localtime; print "$query executed successfully at ",(localtime); print "$query executed successfully at ".(localtime); Output executed successfully at 355516731103960 executed successfully at 355516731103960 executed successfully at Wed Apr 7 16:55:35 2010 The first two statements are not printing the current time in a date format. Third statement only giving the correct output in a date format. My understanding is the first one is returning a value in scalar context,so it is returning numbers. Then in the second print I used localtime in list context only,why it's also giving number output.

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  • save the input value in a 2dimentsion array

    - by arash
    hi friends,how can i save the number that user enter in textbox in a 2 dimension array? for example: i have this numbers in textbox:45,78 and now i want to save 45,32 like this: array[0,0]=45 and array[0,1]=78 how can i do that?thanks,so much edited: oh,when i entered 1,2,3,4,5,6,7,8,9 in textbox and it takes [2,2]=56 private void button10_Click(object sender, EventArgs e) { int matrixDimention = 2; int[,] intValues = new int[matrixDimention + 1, matrixDimention + 1]; string[] splitValues = textBox9.Text.Split(','); for (int i = 0; i < splitValues.Length; i++) intValues[i % (matrixDimention + 1), i % (matrixDimention + 1)] = Convert.ToInt32(splitValues[i]); string a=intValues[2,2].ToString(); MessageBox.Show(a); } when i take: string a=intValues[2,1].ToString(); it shows 0

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  • Measuring debug vs release of ASP.NET applications

    - by Alex Angas
    A question at work came up about building ASP.NET applications in release vs debug mode. When researching further (particularly on SO), general advice is that setting <compilation debug="true"> in web.config has a much bigger impact. Has anyone done any testing to get some actual numbers about this? Here's the sort of information I'm looking for (which may give away my experience with testing such things): Execution time | Debug build | Release build -------------------+---------------+--------------- Debug web.config | average 1 | average 2 Retail web.config | average 3 | average 4 Max memory usage | Debug build | Release build -------------------+---------------+--------------- Debug web.config | average 1 | average 2 Retail web.config | average 3 | average 4 Output file size | Debug build | Release build -------------------+---------------+--------------- | size 1 | size 2

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  • Passing an empty IEnumerable argument to a method

    - by avance70
    I have this method (simplified): void DoSomething(IEnumerable<int> numbers); And I invoke it like this: DoSomething(condition==true?results:new List<int>()); The variable results is formed with a LINQ select condition (IEnumerable). I was wondering is this List<int>() the best way (the fastest?) to pass an empty collection, or is new int[0] better? Or, something else would be faster, a Collection, etc.? In my example null wouldn't be ok.

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  • Count of memory copies in *nix systems between packet at NIC and user application?

    - by Michael_73
    Hi there, This is just a general question relating to some high-performance computing I've been wondering about. A certain low-latency messaging vendor speaks in its supporting documentation about using raw sockets to transfer the data directly from the network device to the user application and in so doing it speaks about reducing the messaging latency even further than it does anyway (in other admittedly carefully thought-out design decisions). My question is therefore to those that grok the networking stacks on Unix or Unix-like systems. How much difference are they likely to be able to realise using this method? Feel free to answer in terms of memory copies, numbers of whales rescued or areas the size of Wales ;) Their messaging is UDP-based, as I understand it, so there's no problem with establishing TCP connections etc. Any other points of interest on this topic would be gratefully thought about! Best wishes, Mike

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  • How can I create numbered map markers in Google Maps V3?

    - by kaneuniversal
    I'm working on a map that has multiple markers on it. These markers use a custom icon, but I'd also like to add numbers on top. I've seen how this has been accomplished using older versions of the API. How can I do this in V3? *Note -- the "title" attribute creates a tooltip when you mouseover the marker, but I want something that will be layered on top of the custom image even when you're not hovering on top of it. Here's the documentation for the marker class, and none of these attributes seem to help: http://code.google.com/apis/maps/documentation/v3/reference.html#MarkerOptions Thank you . . . . Michael

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  • Source control Branching needs

    - by Mükremin
    Hello, we are creating hospital information system software. The project will be different hospital to hospital and contain different use cases. But lots of parts will be the same. So we will use branching mechanism of the source control. If we find a bug in one hospital, how can we know the other branches have the same bug or not. Resim The numbers in the picture which we attached show the each hospital software. Do you have a solution about this problem ? Which source control(SVN,Git,Hg) we will be suitable about this problem ? Thank you.!

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  • JAVA or JAVA SCRIPT OR Idoc SCRIPT alphabetical sort

    - by tito86
    Hi folks, I have a task: All items within categories should be sorted alphabetically except for Examples. Special characters and numbers should be displayed before letters. I'm facing with a problem. Most of standart sort functions and plugins are being used the ASCII table. In this table the following symboles: ~,},{ etc. have the index more than letters,for example: Actual result of sorting is: 1 - #1 A T 2 - A T 3 - {C T I need to get: 1 - #1 A T 2 - {C T 3 - A T Plese give me your piece of advice or sny examples ASAP. Best Regards.

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  • What is this for an IP in my google app engine log file?

    - by Christian Harms
    I get many normal log lines in my google app engine application. But today I go these instead the 4-part number: 2a01:e35:2f20:f770:6c54:3ee8:67fb:df8 What is this for an format? ipv6 are 6 numbers, mac address too... Normal logfile line: 187.14.44.208 - - [19/Mar/2010:14:31:35 -0700] "GET /geo_data.js HTTP/1.1" 200 776 "http://www.xxx.com.br/spl19/index.php?refid=gv_av_ri" "Mozilla/5.0 (Windows; U; Windows NT 5.1; pt-BR; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729),gzip(gfe)" This special logfile line: 2a01:e35:2f20:f770:6c54:3ee8:67fb:df8 - - [18/Mar/2010:17:00:37 -0700] "GET /geo_data.js HTTP/1.1" 500 450 "http://www.xxx.com.br/spl19/index.php?refid=cm_av_ri" "Mozilla/5.0 (Windows; U; Windows NT 6.1; pt-PT; rv:1.9.2) Gecko/20100115 Firefox/3.6,gzip(gfe)"

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  • PHP float bug: PHP Hangs On Numeric Value

    - by jeroen
    I just read an interesting article about php hanging on certain float numbers, see The Register and Exploring Binary. I never explicitly use floats, I use number_format() to clean my input and display for example prices. Also, as far as I am aware, all input from for example forms are strings until I tell them otherwise so I am supposing that this problem does not affect me. Am I right, or do I need to check for example Wordpress and Squirrelmail installations on my server to see if they cast anything to float? Or better, grep all php files on my servers for float?

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  • best way to output a full precision double into a text file

    - by flevine100
    Hi, I need to use an existing text file to store some very precise values. When read back in, the numbers essentially need to be exactly equivalent to the ones that were originally written. Now, a normal person would use a binary file... for a number of reasons, that's not possible in this case. So... do any of you have a good way of encoding a double as a string of characters (aside from increasing the precision). My first thought was to cast the double to a char[] and write out the chars. I don't think that's going to work because some of the characters are not visible, produce sounds, and even terminate strings ('\0'... I'm talkin to you!) Thoughts?

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