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• Complex Calculations

  - by mson

  What are the best tools (most efficient) available in .NET (C#) for calculating: integrals partial derivatives other non-trivial math Can people please comment on Mathematica and Matlab and their integration into C#?

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• what are sparse voxel octrees?

  - by pdeva

  I have reading a lot about the potential use of sparse voxel octrees in future graphics engines. However I have been unable to find technical information on them. I understand what a voxel is, however I dont know what sparse voxel octrees are or how are they any more efficient than the polygonal techniques in use now. Could somebody explain or point me to an explanation for this?

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• Is it possible to use 'else' in a python list comprehension?

  - by Josh

  Here is the code I was trying to turn into a list comprehension: table = '' for index in xrange(256): if index in ords_to_keep: table += chr(index) else: table += replace_with Is there a way to add the else statement to this comprehension? table = ''.join(chr(index) for index in xrange(15) if index in ords_to_keep) Also, would I be right in concluding that a list comprehension is the most efficient way to do this?

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• sending +-200 emails using php mail() function in a loop

  - by Glenn

  Note: It is worth noting that the mail() function is not suitable for larger volumes of email in a loop. This function opens and closes an SMTP socket for each email, which is not very efficient. Source: PHP manual What are larger volumes? A 100 or a 1000?? Can I safely make it loop 200 times without much problems? (I can't install pear)

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• Is there a bruteforce-proof hashing algorithm?

  - by Col. Shrapnel

  Well, from the discussion of hashing methods weaknesses, I've got that the only ol' good brute-force is efficient to break. So, the question is: Is there a hashing algorithm which is more steady against brute-force than others?

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• Embedding Flash & Quicktime Via JavaScript

  - by thesunneversets

  I have a JavaScript function that loads a flash movie into a webpage div using swfobject.embedSWF(). I want to be able to, alternatively, load a .mov file into the same div, in the event that this is the file found instead of the .swf. Is there a close equivalent to swfobject.embedSWF for the purposes of embedding a .mov file? If not, what is an efficient route to doing this using JavaScript?

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• What is the best way to create continuously looping background in iPhone SDK ?

  - by catpad

  What is the best way to create a continuously looping background using iPhone SDK so that it seems the foreground object is in perpetual motion ? I have a background image which I want to move continuously at a given speed from right to left and seamlessly start displaying the beginning of the image when its end is reached. What is the best, most efficient way to do it to avoid any jumps and get optimal performance ?

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• Why do updates inside of a SQL transaction still need disk IO?

  - by usr

  In SQL Profiler you can see that very simple updates to a table by primary key take about 10-30ms each. On about every 10th update the write column shows 1, on all other updates it shows 0. This must mean that about every 10th update statement still requires disk IO. I wonder why that is. Would it not be more efficient queue up all IO until the transaction commits?

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• Given an array of arrays, how can I strip out the substring "GB" from each value?

  - by stormist

  Each item in my array is an array of about 5 values.. Some of them are numerical ending in "GB".. I need the same array but with "GB" stripped out so that just the number remains. So I need to iterate through my whole array, on each subarray take each value and strip the string "GB" from it and create a new array from the output. Can anyone recommend and efficient method of doing this?

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• Catching an exception that is nested into another exception

  - by Bernhard V

  Hi, I want to catch an exception, that is nested into another exception. I'm doing it currently this way: } catch (RemoteAccessException e) { if (e != null && e.getCause() != null && e.getCause().getCause() != null) { MyException etrp = (MyException) e.getCause().getCause(); ... } else { throw new IllegalStateException("Error at calling service 'beitragskontonrVerwalten'"); } } Is there a way to do this more efficient and elegant?

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• finding and returning a string with a specified prefix

  - by tipu

  I am close but I am not sure what to do with the restuling match object. If I do p = re.search('[/@.* /]', str) I'll get any words that start with @ and end up with a space. This is what I want. However this returns a Match object that I dont' know what to do with. What's the most computationally efficient way of finding and returning a string which is prefixed with a @? For example, "Hi there @guy" After doing the proper calculations, I would be returned guy

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• Get name given a phone number on the iPhone

  - by ganti

  I'm using a TextField where the user types a phone number. When the TextField changes, it should check if this number is already in the phonebook and display the name. So far, my only way is to parse all names and number in a Dict and read it from there. Is there a simpler, more efficient and sophisticated way to do that?

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• What is the faster way of trying to find a single character on a String?

  - by vtortola

  Hi, What of this code is faster/more efficient? : Boolean contains = myString.IndexOf("~", StringComparision.InvariantCultureIgnoreCase)!=-1; or Boolean contains = myString.IndexOf('~')!=-1; I think the second because is a single character, but using the invariant culture ignore case comparer is supposed to be fast too :P Cheers.

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• jQuery validation on textarea

  - by Espen Arnoy

  I have this code inside a form of mine: <textarea>Your message</textarea> The html content of the tag will be emptied on focus. I want to run some validation on this field with jQuery. First, the value of this field should not be = "". Secondly, the content of the tag should not be = "Your message". Anyone knows how I can archive this in the most efficient way?

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• Save output of a php file in a html file..

  - by piemesons

  I am having a php file which executes some code to generate a html file.Its like I m having a form from which some data will be posted to x.php file, which gives a output(a webpage). I want to save that output in a html file.What the most efficient way of doing this.?

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• Get name given by phone number on the iPhone

  - by ganti

  I'm using a TextField where the user types a phone number. When the TextField changes, it should check if this number is already in the phonebook and display the name. So far, my only way is to parse all names and number in a Dict and read it from there. Is there a simpler, more efficient and sophisticated way to do that?

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• Multiple OR Clauses in MySQL

  - by Grant

  I'm trying to grab content where id = 3 OR id = 9 OR id = 100... Keep in mind, I can have a few hundred of these ids. What is the most efficient way to write my query? $sql = "SELECT name FROM artists WHERE (id=3 OR id=9 OR .... id-100)"

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• How can I hash a string to an int using c++?

  - by zebraman

  I have to write my own hash function. If I wanted to just make the simple hash function that maps each letter in the string to a numerical value (i.e. a=1, b=2, c=3, ...), is there a way I can perform this hash on a string without having to first convert it to a c-string to look at each individual char? Is there a more efficient way of hashing strings?

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• Sum values in a DataTable by a given criteria

  - by šljaker

  Which is the most effective way to sum data in the DataTable by a given criteria? I have the following table: KEY_1 KEY_2, VALUE_1, VALUE_2 Input: 01101, P, 2, 3 01101, F, 1, 1 01101, P, 4, 4 10102, F, 5, 7 Desired output (new DataTable): 01101, P, 6, 7 01101, F, 1, 1 01101, SUM, 7, 8 10102, F, 5, 7 10102, SUM, 5, 7 I need efficient algorithm, because I have 10k rows and 18 columns in a DataTable. Thank you.

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• How can I memoize a method that may return true or false in Ruby?

  - by Seamus Abshere

  Obviously ||= won't work def x? @x_query ||= expensive_way_to_calculate_x end because if it turns out to be false, then expensive_way_to_calculate_x will get run over and over. Currently the best way I know is to put the memoized true or false into an Array: def x? return @x_query.first if @x_query.is_a?(Array) @x_query = [expensive_way_to_calculate_x] @x_query.first end Is there a more conventional or efficient way of doing this?

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• Random record from MongoDB

  - by Will M

  I am looking to get a random record from a huge (100 million record) mongodb. What is the fastest and most efficient way to do so? The data is already there and there are no field in which I can generate a random number and obtain a random row. Any suggestions?

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• What data type to use for variable lenght data for performance

  - by jiewmeng

  what data type shld i use for data that can be very short, eg. html link (think twitter), or very long eg. html blog post (think wordpress) i am thinking if i use varchar(4000), it maybe too short for a html formated blog entry? but if i use text, it will take up more space and is less efficient?

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• Fastest way to make a dict a single comma-separated string

  - by ensnare

  I have a list of uids: ['1234','4321','1111'] and I would like to turn this into a single string of: "uid = '1234' OR uid = '4321' OR uid = '1111'" What's the most efficient way to do this? Thanks!

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• Browser size (width and height)

  - by dono

  I'm trying to detect the browser's current size (width and height). I know it's super easy in jquery with $(document).width and $document.height, but I don't want to add the size of the jquery lib to the project, so I'd rather just use built in javascript. What would be the short and efficient way to do the same thing with javascript?

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• get a range of objects with binary search

  - by Behrooz

  I have some data like this: ID Value 1 AAA 1 ABC 2 dasd 2 dsfdsf 2 dsfsd 3 df 3 dwqef they are objects(not plain text). and i want to get all objects with the ID = 2. I can do a binary binary search and get the index 3,but how can i get (2 and 4) is there any efficient algorithm? the real problem has lists with about one Million items. any language except bf and lisp can help.

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