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• Is there an easily available implementation of erf() for Python?

  - by rog

  I can implement the error function, erf, myself, but I'd prefer not to. Is there a python package with no external dependencies that contains an implementation of this function? I have found http://pylab.sourceforge.net/packages/included_functions.htmlthis but this seems to be part of some much larger package (and it's not even clear which one!). I'm sorry if this is a naive question - I'm totally new to Python.

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• Can you execute multiple statements in with a If statement?

  - by Jack Null

  This is my function: (defun MyFunction(input) (let ((NEWNUM (find input num))) (if (find input num) //if this (setq num NEWNUM) (FUNCT2) //then execute both of these (list 'not found)))) //else output this So after the if statment I want to be able to execute (setq num NEWNUM) and (FUNCT2). One to set a new variable and then the other to call a function. Any ideas on how to do this?

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• Bind to several class properties

  - by Polaris

  Hello developers. I have some class with properties firstName and lastName. I want bind TextBlock to concatanation of this two properties. I know that I can create third property that will be return concatanation of these properties. But I dont want to use this approach. Is it possible to Bind TextBlock to two properties. and also I dont want create composite userControl.

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• matlab: subs on symbolic constant returns scalar instead of vector for a vector input

  - by noam

  usually, symbolic functions return vectors for vector inputs: syms('x'); f=x*2; subs(f,[1 2 3]) outputs: [2 4 6] but doing f=sym('0'); subs(f,[1 2 3]); outputs: 0 and not: [0 0 0] so basically, my questions is how do I make f behave as a "normal" symbolic function. I can do something ugly like f=x-x to create a function that always returns zero, but is there a prettier way?

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• Thread safety with heap-allocated memory

  - by incrediman

  I was reading this: http://en.wikipedia.org/wiki/Thread_safety Is the following function thread-safe? void foo(int y){ int * x = new int[50]; /*...do some stuff with the allocated memory...*/ delete x; } In the article it says that to be thread-safe you can only use variables from the stack. Really? Why? Wouldn't subsequent calls of the above function allocate memory elsewhere?

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• Permission denied for folder creation using background_fu

  - by Anubhaw

  Hi All, I am calling a controller method to convert a video file. This process is called using background_fu job. When the function tries to create a new folder in rails root it gives error i.e. Permission denied. The function performs well if not called in background job process. Can any one point out what can be the trouble. Thanks in advance, Anubhaw

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• DrawPrimitive with alpha

  - by confusedman

  I'm trying to draw a line with the DrawPrimitive function in Direct3D. Can I draw tranparent line with the function? If I can, how to design it?

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• Returning the size of available virtual memory at run-time in C++

  - by Greenhouse Gases

  In C++ is there a predefined library function that will return the size of RAM currently available on a computer a program is being run on, at run-time? For instance, if an object is 4bytes, then can we divide the available virtual memory by 4 bytes to give an estimate of how many more objects could be stored by the program safely? I have used the sizeof() function to return the size of objects within my program. Thanks

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• mySQL convert varchar to date

  - by Jeff V

  I need to convert a varchar value of 1/9/2011 to a date in mySQL and I want only the month and year. So that I can then use the PERIOD_DIFF function (so I would need the above to be converted to 201101). I've tried various ways using the STR_TO_DATE function: SELECT STR_TO_DATE(CYOApp_oilChangedDate, '%m/%Y') FROM CYO_AppInfo But I get weird results... (for example: 2009-01-00) What am I doing incorrectly?

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• Loading SQLite Database into Android App

  - by Chris

  I am able to create, write and read an SQLite Database in my Android App. I have a copy of the Database that is fully populated with data, and I want to get that data into the App's Database. Is it possible to access my pouplaed database from inside my App? Or can I at least create a copy of the populated database and then use that copy? Or do I need to do a .dump and put all the inserts into the Android code?

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• Using jQuery, how do you mimic the form serialization for a select with multiple options selected in

  - by CarolinaJay65

  Below is my $.ajax call, how do I put a selects (multiple) selected values in the data section? $.ajax({ type: "post", url: "http://myServer" , dataType: "text", data: { 'service' : 'myService', 'program' : 'myProgram', 'start' : start, 'end' : end , }, success: function(request) { result.innerHTML = request ; } // End success }); // End ajax method EDIT I should have included that I understand how to loop through the selects selected options with this code: $('#userid option').each(function(i) { if (this.selected == true) { but how do I fit that into my data: section?

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• Jquery with & , + and etc signs

  - by Loon Yew

  function testing() { $.ajax({ type: "POST", url: "testing.php", data: "call="+$("#abc").val(), success: function(msg){ alert( msg ); } }); } I want to post the data to testing.php but if i got special characters like & sign. it will create the problem. How do i go about it? Thank You

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• How to get value of href in Jquery

  - by user342391

  I am trying to grab the value of my href in jquery how is it done'? This is what I have done: $('#playbackbutton').click( function() { $("#playbackdiv").load("$('a:href').val();", [], function(){ $("#playbackdiv").dialog("open"); } ); return false; } I need to get the value of the href in my a tag. here is the html: <a href="/record/123.wav">play</a>

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• Remove CSS from a Div using JQuery

  - by Aruna

  Hi, I'm new to JQuery. In my App I have the following: $("#displayPanel div").live("click", function(){ $(this).css({'background-color' : 'pink', 'font-weight' : 'bolder'}); }); When I click on a Div, the color of that Div is changed. Within that Click function I have some functionalities to do. After all that I want to remove the applied Css from the Div. How could I do it in JQuery?

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• request uri showing include path

  - by johnsz

  I am trying to get the URL from a function I wrote. But because the function is included into the file, its brining back the include path and not the url. Is there a work around? i should get /example.php but instead i get includes/url-logger.php this is done via $_SERVER['request_uri'] cheers

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• jquery select list remove

  - by mazhar

  there are 2 multiple select list on my page , one is there with a seperate remove button . selecting an item there in the selected list is removing the item from the first select list also.how will i specify which list to remove item from in this code $().ready(function() { $('#remove').click(function() { return !$('#FeatureList option:selected').remove(); }); });

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• Local variable vs parameter

  - by Dhana

  function doIt(param) { var localVar = param; //do lots of stuff with localVar } function doIt(param) { //do lots of stuff with param } Is there any difference in terms of efficiency between the code above?

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• Optimizing division/exponential calculation

  - by Saltheart

  I've inherited a Visual Studio/VB.Net numerical simulation project that has a likely inefficient calculation. Profiling indicates that the function is called a lot (1 million times plus) and spends about 50% of the overall calculation within this function. Here is the problematic portion Result = (A * (E ^ C)) / (D ^ C * B) (where A-C are local double variables and D & E global double variables) Result is then compared to a threshold which might have additional improvements as well, but I'll leave them another day any thoughts or help would be appreciated Steve

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• getJSON callback not firing

  - by Marty Trenouth

  I'm making the call using the following script which is called on click of an anchor tag function GetToken(videoId) { debugger; var json = $.getJSON("/Vod/RequestAccessToken/"+videoId, function(result){ alert("token recieved: " + result.token); }); } In the server application I recieve the call so I know it is a valid URL, but the callback is not being invoked. If i set though the jquery code (f11/f10) the callback is called??!!!?

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• Apply Xslt on in-memory Xml and returning in-memory Xml

  - by Jan Willem B

  I am looking for a static function in the .NET framework which takes an XML snippet and an Xslt file, applies the transformation in memory, and returns the transformed XML. I would like to do this: string rawXml = invoiceTemplateDoc.MainDocumentPart.Document.InnerXml; rawXml = DoXsltTransformation(rawXml, @"c:\prepare-invoice.xslt")); // ... do more manipulations on the rawXml Alternatively, instead of taking and returning strings, it could be taking and returning XmlNodes. Is there such a function?

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• Javascript jQuery ajax submit default data

  - by onlineracoon

  How to submit default data when using $.ajax? I have tried: $.ajaxPrefilter(function(options, originalOptions, jqXHR) { // can't access anything here... (tried jqXHR.data but undefined) }); $.ajaxSetup({ beforeSend: function(jqXHR, settings) { // can't access anything here... (tried jqXHR.data but undefined) } }); I need this so I can send my CSRF token, each time and when logged in submit the user ID each time. I prefer not to submit a token in headers. Thanks

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• jquery ui dialog change position after first click

  - by user1958218

  I am using jquery uimodaldialog and this is setting $("#dialog").dialog({ autoOpen : false, minWidth : 700, show : { effect : "fade", duration : 1000 }, hide : { effect : "fade", duration : 1000 }, close : function(event, ui) { }, }); I am calling with this $('.mylink').on('click', function() { $( "#dialog" ).dialog( "open"); Now on first click it shows at center of page . if I click again then it goes about 200px upwards. On further clicking it says there

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• j query validation plugin for two fields

  - by jonathan p

  I am using the Jquery Validation plug-in, however i need to add a "custom rule", i have 2 date fields and i need to ensure that the end date is not less than the start date. My problem is how to pass the two fields in as elements. As i understand u set up a custom function something like this : function customValidationMethod(value, element, params){ } But can't see how i could use it with two fields, if anyone has any ideas it would be greatly appreciated.

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• What is the purpose of using a reference to a reference in C++?

  - by SilverSun

  In my adventures studying the boost libraries, I've come across function signatures that have parameters which are a reference to a reference to an object. Example: void function(int && i); What is the purpose/benefit of doing it this way rather than simply taking a reference to an object? I assume there is one if it's in boost.

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• How to compare strings ignoring case (C++)?

  - by zebraman

  I am aware there is a function strcasecmp() that compares cstrings ignoring case, but I was wondering if there is a function that does the same thing except with strings? I am working with a bunch of strings, and feel like it would be terribly inefficient to have to use c_str() each time I want to compare them with strcasecmp(). Should I just use cstrings instead of strings...?

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