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  • cartesian product

    - by John Retallack
    I've been trying to do a function that returns the Cartesian Product of n sets,in Dr Scheme,the sets are given as a list of lists,I've been stuck at this all day,I would like a few guidelines as where to start,I've wrote a pice of code but it dosen't work. (define cart-n(?(l) (if (null? l) '(()) (map (?(lst) (cons (car ( car(l))) lst)) (cart-n (cdr l) )))))

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  • Linq Projection Question

    - by Micah
    I'm trying to do the following: from c in db.GetAllContactsQuery() select new { ID= c.ID, LastName = c.LastName, FirstName = c.FirstName, Email = c.Email, City =c.City+" "+c.State } The issue i'm running into is that if c.City or c.State are null, the City property returns null. How can I put a function right beside that City= declaration?

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  • Find UTC Offset given a city

    - by soccerfan
    In C++ on Windows, given a city, lets say london or newyork or sydney or singapore etc.. how do I find the UTC offset for each of them, ie the function should be able to accept a city name and return the UTC offset in the current scenario ie taking into account daylight savings. Any ideas how this can be done using win32 APIs

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  • example of a utf-8 format octet string

    - by erik
    I'm working w/ a function that expects a string formatted as a utf-8 encoded octet string. Can someone give me an example of what a utf-8 encoded octet string would look like? Put another way, if I convert 'foo' to bytes, I get 112, 111, 111. What would these char codes look like as a utf-8 encoded octet string? Would it be "0x70 0x6f 0x6f"? Thanks

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  • Sending a JSON array to be received as a Dictionary<string,string>

    - by James Bond
    I have a method with the following signature: public ActionResult RenderFamilyTree(string name, Dictionary<string, string> children) I'm trying to call it from javascript using jQuery like this: $('#div_render').load( "<%= Url.Action("RenderFamilyTree") %>", { 'name': 'Raul', [ {'key':'key1','value':'value1'}, {'key':'key2','value':'value2'} ] }, function() { alert('Loaded'); } ); Am I missing something to get this to work?

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  • Mechanize Javascript ...

    - by Horace Ho
    I try to submit a form by Mechanize, however, I am not sure how to add necessary form valuables which are done by some Javascript. Since Mechanize does not support Javascript yet, and so I try to add the variables manually. The form source: <form name="aspnetForm" method="post" action="list.aspx" language="javascript" onkeypress="javascript:return WebForm_FireDefaultButton(event, '_ctl0_ContentPlaceHolder1_cmdSearch')" id="aspnetForm"> <input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" /> <input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" /> <input type="hidden" name="__LASTFOCUS" id="__LASTFOCUS" value="" /> <input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/..." /> <script type="text/javascript"> <!-- var theForm = document.forms['aspnetForm']; if (!theForm) { theForm = document.aspnetForm; } function __doPostBack(eventTarget, eventArgument) { if (!theForm.onsubmit || (theForm.onsubmit() != false)) { theForm.__EVENTTARGET.value = eventTarget; theForm.__EVENTARGUMENT.value = eventArgument; theForm.submit(); } } // --> </script> <script language="javascript"> <!-- var _linkpostbackhit = 0; function _linkedClicked(id, key, str, a, b) { if (!b || !_linkpostbackhit) { if (!a) { __doPostBack(key, id); _linkpostbackhit = 1; } else { if (window.confirm(str)) { __doPostBack(key, id); _linkpostbackhit = 1; } } } return void(0); } // --> </script> ... <a href="JavaScript:_linkedClicked('123456','_ctl0:ContentPlaceHolder1:Link', '',0,1);">123456</a> ... </form> I tried to add the 2 variables: page.forms.first['__EVENTTARGET'] = '_ctl0:ContentPlaceHolder1:Link' page.forms.first['__EVENTARUGMENT'] = '123456' and submit the form: page.forms.first.click_button(page.forms.first.buttons.first) The result returned only (re)show the current list of links as if I have not clicked on any of the links. Any help will be appreciated. Thanks!

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  • How to limit an upload speed in java servlet?

    - by den-javamaniac
    Hi. I'm working on an app (based on Spring as DI and MVC framework) that has a file upload function which is currently implemented using Spring Multipart Upload (which in it's turn utilizes commons fileupload libs). So what I'm looking for is a way to lower the upload bandwidth consumption. How can I accomplish that?

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  • Use native HBitmap in C# while preserving alpha channel/transparency. Please check this code, it works on my computer...

    - by David
    Let's say I get a HBITMAP object/handle from a native Windows function. I can convert it to a managed bitmap using Bitmap.FromHbitmap(nativeHBitmap), but if the native image has transparency information (alpha channel), it is lost by this conversion. There are a few questions on Stack Overflow regarding this issue. Using information from the first answer of this question (How to draw ARGB bitmap using GDI+?), I wrote a piece of code that I've tried and it works. It basically gets the native HBitmap width, height and the pointer to the location of the pixel data using GetObject and the BITMAP structure, and then calls the managed Bitmap constructor: Bitmap managedBitmap = new Bitmap(bitmapStruct.bmWidth, bitmapStruct.bmHeight, bitmapStruct.bmWidth * 4, PixelFormat.Format32bppArgb, bitmapStruct.bmBits); As I understand (please correct me if I'm wrong), this does not copy the actual pixel data from the native HBitmap to the managed bitmap, it simply points the managed bitmap to the pixel data from the native HBitmap. And I don't draw the bitmap here on another Graphics (DC) or on another bitmap, to avoid unnecessary memory copying, especially for large bitmaps. I can simply assign this bitmap to a PictureBox control or the the Form BackgroundImage property. And it works, the bitmap is displayed correctly, using transparency. When I no longer use the bitmap, I make sure the BackgroundImage property is no longer pointing to the bitmap, and I dispose both the managed bitmap and the native HBitmap. The Question: Can you tell me if this reasoning and code seems correct. I hope I will not get some unexpected behaviors or errors. And I hope I'm freeing all the memory and objects correctly. private void Example() { IntPtr nativeHBitmap = IntPtr.Zero; /* Get the native HBitmap object from a Windows function here */ // Create the BITMAP structure and get info from our nativeHBitmap NativeMethods.BITMAP bitmapStruct = new NativeMethods.BITMAP(); NativeMethods.GetObjectBitmap(nativeHBitmap, Marshal.SizeOf(bitmapStruct), ref bitmapStruct); // Create the managed bitmap using the pointer to the pixel data of the native HBitmap Bitmap managedBitmap = new Bitmap( bitmapStruct.bmWidth, bitmapStruct.bmHeight, bitmapStruct.bmWidth * 4, PixelFormat.Format32bppArgb, bitmapStruct.bmBits); // Show the bitmap this.BackgroundImage = managedBitmap; /* Run the program, use the image */ MessageBox.Show("running..."); // When the image is no longer needed, dispose both the managed Bitmap object and the native HBitmap this.BackgroundImage = null; managedBitmap.Dispose(); NativeMethods.DeleteObject(nativeHBitmap); } internal static class NativeMethods { [StructLayout(LayoutKind.Sequential)] public struct BITMAP { public int bmType; public int bmWidth; public int bmHeight; public int bmWidthBytes; public ushort bmPlanes; public ushort bmBitsPixel; public IntPtr bmBits; } [DllImport("gdi32", CharSet = CharSet.Auto, EntryPoint = "GetObject")] public static extern int GetObjectBitmap(IntPtr hObject, int nCount, ref BITMAP lpObject); [DllImport("gdi32.dll")] internal static extern bool DeleteObject(IntPtr hObject); }

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  • Is there a jQuery webscraper out there?

    - by victor hugo
    I'm trying to pullout some info from an external site using jQuery and Adobe AIR. Right now I'm using a hidden div and jQuery's load function to load fragments of the external site, once the info is loaded I parse some info with selectors. This is fine but it's kinda dirty and I need to perform this several times (don't want to need many hidden divs). Just wondering if anybody knows a good webscrapper written in jQuery or maybe another method I'm missing

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  • Hash Join require Full Table Scan

    - by Pedro Magalhaes
    So, I want to know if to make a Hash Join between two tables is necessary to make a full table scan on the collumns? If i want to join COL1 wiht COL2, and COL1 is smaller, the It makes a full scan in COL1 creating a Hashmap then makes a full scan in COL2 using the sabe hash function. Is this correct?

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  • ActionScript black color value is NaN

    - by TheDarkIn1978
    i'm trying to determine if a color has been supplied as an optional argument to a function. in order to determine this, i'm simply writing if(color){...} and supplying NaN if i don't want there to be a color. however, it seems that the color black (0x000000) also equates to NaN. how can i determine if a supplied color number argument is present and black if 0x000000 is passed as the argument?

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  • ActiveRecord + CodeIgniter - Return single value from query, not in array form.

    - by txmail
    Say you construct an activerecord query that will always just return a single value, how do you just address that single value instead of getting an array in return? For instance I am using an ActiveRecord query to return the SUM of a single column, it will only return this one single SUM, instead of having to parse the array is there a way to assign the value as a function return equal to that value instead of getting an array?

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  • ASP.Net Charting Control - Display a Threshold

    - by Damien
    Is it possible to display a static line across a chart which appears at a given point on the Y Axis? So say I have a chart which measures test scores, ranges which 0 to 100 which 70% being the pass mark and therefore displaying a straight line across the chart at this point? Would I have to add a new series or is there a property for such a function? Thanks, Damien

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  • How can I partition a vector?

    - by Karsten W.
    How can I build a function slice(x, n=2) which would return a list of vectors where each vector except maybe the last has size n, i.e. slice(letters, 10) would return list(c("a", "b", "c", "d", "e", "f", "g", "h", "i", "j"), c("k", "l", "m", "n", "o", "p", "q", "r", "s", "t"), c("u", "v", "w", "x", "y", "z")) ?

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  • Doctrine CodeIgniter MySQL CRUD errors

    - by 01010011
    Hi, I am using CI + Doctrine + MySQL and I am getting the following CRUD errors: (1) When trying to create a new record in the database with this code: $book_title = 'The Peloponnesian War'; $b = new Book(); $b-title = $book_title; $b-price = 10.50; $b-save(); I get this error: Fatal error: Uncaught exeption 'Doctrine_Connection_Mysql_Exception' with message 'SQLSTATE[42S22]: Column not found: 1054 Unknown column 'title' in 'field list' in ... (2) When trying to fetch a record from the database and display on my view page with this code: $book_title = 'The Peloponnesian War'; $title = $book_title; $search_results = Doctrine::getTable('Book')-findOneByTitle($title); echo $search_results-title; (in view file) I get this error: Fatal error: Uncaught exception 'Doctrine_Connection_Mysql_Exception' with message 'SQLSTATE[45S22]: Column not found: 1054 Unknown column 'b.id' in 'field list" in ... And finally, when I try to update a record as follows: $book_title = 'The Peloponnesian War'; $title = $book_title; $u = Doctrine::getTable('Book')-find($title); $u-title = $title; $u-save(); I get a similar error: Fatal error: Uncaught exception 'Doctrine_Connection_Mysql_Exception' with message 'SQLSTATE[42S22]: Column not found: 1054 Unknown column 'b.id' in 'field list''in ... Here is my Doctrine_Record model: class Book extends Doctrine_Record{ public function setTableDefinition() { $this->hasColumn('book_id'); $this->hasColumn('isbn10','varchar',20); $this->hasColumn('isbn13','varchar',20); $this->hasColumn('title','varchar',100); $this->hasColumn('edition','varchar',20); $this->hasColumn('author_f_name','varchar',20); $this->hasColumn('author_m_name','varchar',20); $this->hasColumn('author_l_name','varchar',20); $this->hasColumn('cond','enum',null, array('values' => array('as new','very good','good','fair','poor'))); $this->hasColumn('price','decimal',8, array('scale' =>2)); $this->hasColumn('genre','varchar',20); } public function setUp() { $this->setTableName('Book'); //$this->actAs('Timestampable'); } Any assistance will be really appreciated. Thanks in advance.

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  • grep_replace: unknown modifier

    - by tic
    Let assume that $body is equal to something that does not interest me <!-- start --> some html code <!-- end --> something that does not interest me If I use $body=preg_replace("(.*)<!-- start -->(.*)<!-- end -->(.*)","$2",$body); I obtain: Warning: preg_replace() [function.preg-replace]: Unknown modifier '<' How have I to correct?

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  • How do bezier handles work?

    - by user146780
    On Wikipedia I found information about bezier curves and made a function to generate the inbetween points for a bezier polygon. I noticed that Expression Design uses bezier handles. This allows a circle to be made with 4 points each with a bezier handle. I'm just not sure mathematically how this works in relation with the formula for bezier point at time T. How do these handle vectors work to modify the shape? Basically what's there relation to the bezier formula? Thanks

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  • TVirtualStringTree - resetting non-visual nodes and memory comsumption

    - by Remy Lebeau - TeamB
    I have an app that loads records from a binary log file and displays them in a virtual TListView. There are potentially millions of records in a file, and the display can be filtered by the user, so I do not load all of the records in memory at one time, and the ListView item indexes are not a 1-to-1 relation with the file record offsets (List item 1 may be file record 100, for instance). I use the ListView's OnDataHint event to load records for just the items the ListView is actually interested in. As the user scrolls around, the range specified by OnDataHint changes, allowing me to free records that are not in the new range, and allocate new records as needed. This works fine, speed is tolerable, and the memory footprint is very low. I am currently evaluating TVirtualStringTree as a replacement for the TListView, mainly because I want to add the ability to expand/collapse records that span multiple lines (I can fudge it with the TListView by incrementing/decrementing the item count dynamically, but this is not as straight forward as using a real tree). For the most part, I have been able to port the TListView logic and have everything work as I need. I notice that TVirtualStringTree's virtual paridigm is vastly different, though. It does not have the same kind of OnDataHint functionality that TListView does (I can use the OnScroll event to fake it, which allows my memory buffer logic to continue working), and I can use the OnInitializeNode event to associate nodes with records that are allocated. However, once a tree node is initialized, it sees that it remains initialized for the lifetime of the tree. That is not good for me. As the user scrolls around and I remove records from memory, I need to reset those non-visual nodes without removing them from the tree completely, or losing their expand/collapse states. When the user scrolls them back into view, I can re-allocate the records and re-initialize the nodes. Basically, I want to make TVirtualStringTree act as much like TListView as possible, as far as its virtualization is concerned. I have seen that TVirtualStringTree has a ResetNode() method, but I encounter various errors whenever I try to use it. I must be using it wrong. I also thought of just storing a data pointer inside each node to my record buffers, and I allocate and free memory, update those pointers accordingly. The end effect does not work so well, either. Worse, my largest test log file has ~5 million records in it. If I initialize the TVirtualStringTree with that many nodes at one time (when the log display is unfiltered), the tree's internal overhead for its nodes takes up a whopping 260MB of memory (without any records being allocated yet). Whereas with the TListView, loading the same log file and all the memory logic behind it, I can get away with using just a few MBs. Any ideas?

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  • Zend Form: How to pass parameters into the constructor?

    - by Andrew
    I'm trying to test my form. It will be constructing other objects, so I need a way to mock them. I tried passing them into the constructor... class Form_Event extends Zend_Form { public function __construct($options = null, $regionMapper = null) { $this->_regionMapper = $regionMapper; parent::__construct($options); } ...but I get an exception: Zend_Form_Exception: Only form elements and groups may be overloaded; variable of type "Mock_Model_RegionMapper_b19e528a" provided What am I doing wrong?

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  • Connecting to SQL Server in Php - Extension Err

    - by John Doe
    <html> <head> <title>Connecting </title> </head> <body> <?php $host = "*.*.*.*"; $username = "xxx"; $password = "xxx"; $db_name = "xxx"; $db = mssql_connect($host, $username,$password) or die("Couldnt Connect"); $selected = mssql_select_db($db_name, $db) or die("Couldnt open database"); ?> </body> </html> My error message is: Fatal error: Call to undefined function mssql_connect() in C:\wamp\www\php\dbase.php on line 12 I am using WampServer 2.0 on Php 5.3.0 When I check the extensions, php_mssql is Checked. I also checked the php.ini file to make sure it is not commented out. I have my file dbase.php saved in C:\wamp\www\php. I have tried stopping the service, closing everything, and running it again. I know the problem is that the extension file is not being included somehow. The below is copied from my php.ini file. Note I made all http = /http to avoid posting Links. ;;;;;;;;;;;;;;;;;;;;;;;;; ; Paths and Directories ; ;;;;;;;;;;;;;;;;;;;;;;;;; ; UNIX: "/path1:/path2" ;include_path = ".:/php/includes" ; Windows: "\path1;\path2" include_path = "C:\wamp\bin\php\php5.3.0\ext" ; ; PHP's default setting for include_path is ".;/path/to/php/pear" ; /http://php.net/include-path ; The root of the PHP pages, used only if nonempty. ; if PHP was not compiled with FORCE_REDIRECT, you SHOULD set doc_root ; if you are running php as a CGI under any web server (other than IIS) ; see documentation for security issues. The alternate is to use the ; cgi.force_redirect configuration below ; /http://php.net/doc-root doc_root = ; The directory under which PHP opens the script using /~username used only ; if nonempty. ; /http://php.net/user-dir user_dir = ; Directory in which the loadable extensions (modules) reside. ; /http://php.net/extension-dir ; extension_dir = "./" ; On windows: ; extension_dir = "ext" extension_dir = "c:/wamp/bin/php/php5.3.0/ext/" ; Whether or not to enable the dl() function. The dl() function does NOT work ; properly in multithreaded servers, such as IIS or Zeus, and is automatically ; disabled on them. ; /http://php.net/enable-dl enable_dl = Off ; cgi.force_redirect is necessary to provide security running PHP as a CGI under ; most web servers. Left undefined, PHP turns this on by default. You can ; turn it off here AT YOUR OWN RISK ; You CAN safely turn this off for IIS, in fact, you MUST. ; /http://php.net/cgi.force-redirect ;cgi.force_redirect = 1 ; if cgi.nph is enabled it will force cgi to always sent Status: 200 with ; every request. PHP's default behavior is to disable this feature. ;cgi.nph = 1 ; if cgi.force_redirect is turned on, and you are not running under Apache or Netscape ; (iPlanet) web servers, you MAY need to set an environment variable name that PHP ; will look for to know it is OK to continue execution. Setting this variable MAY ; cause security issues, KNOW WHAT YOU ARE DOING FIRST. ; /http://php.net/cgi.redirect-status-env ;cgi.redirect_status_env = ; ; cgi.fix_pathinfo provides real PATH_INFO/PATH_TRANSLATED support for CGI. PHP's ; previous behaviour was to set PATH_TRANSLATED to SCRIPT_FILENAME, and to not grok ; what PATH_INFO is. For more information on PATH_INFO, see the cgi specs. Setting ; this to 1 will cause PHP CGI to fix its paths to conform to the spec. A setting ; of zero causes PHP to behave as before. Default is 1. You should fix your scripts ; to use SCRIPT_FILENAME rather than PATH_TRANSLATED. ; /http://php.net/cgi.fix-pathinfo ;cgi.fix_pathinfo=1 ; FastCGI under IIS (on WINNT based OS) supports the ability to impersonate ; security tokens of the calling client. This allows IIS to define the ; security context that the request runs under. mod_fastcgi under Apache ; does not currently support this feature (03/17/2002) ; Set to 1 if running under IIS. Default is zero. ; /http://php.net/fastcgi.impersonate ;fastcgi.impersonate = 1; ; Disable logging through FastCGI connection. PHP's default behavior is to enable ; this feature. ;fastcgi.logging = 0 ; cgi.rfc2616_headers configuration option tells PHP what type of headers to ; use when sending HTTP response code. If it's set 0 PHP sends Status: header that ; is supported by Apache. When this option is set to 1 PHP will send ; RFC2616 compliant header. ; Default is zero. ; /http://php.net/cgi.rfc2616-headers ;cgi.rfc2616_headers = 0 ;;;;;;;;;;;;;;;; ; File Uploads ; ;;;;;;;;;;;;;;;; ; Whether to allow HTTP file uploads. ; /http://php.net/file-uploads file_uploads = On ; Temporary directory for HTTP uploaded files (will use system default if not ; specified). ; /http://php.net/upload-tmp-dir upload_tmp_dir = "c:/wamp/tmp" ; Maximum allowed size for uploaded files. ; /http://php.net/upload-max-filesize upload_max_filesize = 2M Also, my php.ini file is saved in: C:\wamp\bin\apache\Apache2.2.11\bin

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  • In Haskell, what does it mean if a binding "shadows an existing binding"?

    - by Alistair
    I'm getting a warning from GHC when I compile: Warning: This binding for 'pats' shadows an existing binding in the definition of 'match_ignore_ancs' Here's the function: match_ignore_ancs (TextPat _ c) (Text t) = c t match_ignore_ancs (TextPat _ _) (Element _ _ _) = False match_ignore_ancs (ElemPat _ _ _) (Text t) = False match_ignore_ancs (ElemPat _ c pats) (Element t avs xs) = c t avs && match_pats pats xs Any idea what this means and how I can fix it? Cheers.

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