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• All possible combinations of n items selected randomly from a set of x items (algorithm)

  - by SubPortal

  I have a set of x string items e.g("A","B","C","D","E","F") I need to know the formula that calculates how many combinations of n items and what is the algorithm that generates all possible combinations e.g if we need to select 4 items from the list randomly. those 4 items could be: ("A","B","C","D") or ("A","B","C","E") or ("A","B","C","F") or ("A","B","D","E") ...etc I need the formula that calculates how many sets of items will be generated without repetition, that is we consider ("A","B","C","D") as one of the resulted combinations we cannot consider the same items as another resultant combination with replacing the positions of the items in the set like ("A","B","D","C") Also I need the algorithm that generates all possible combinations in any programming language. [C#,VB.NET,Java,C++] Thank you for any help.

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• MDX performance vs. T-SQL

  - by SubPortal

  I have a database containing tables with more than 600 million records and a set of stored procedures that make complex search operations on the database. The performance of the stored procedures is so slow even with suitable indexes on the tables. The design of the database is a normal relational db design. I want to change the database design to be multidimensional and use the MDX queries instead of the traditional T-SQL queries but the question is: Is the MDX query better than the traditional T-SQL query with regard to performance? and if yes, to what extent will that improve the performance of the queries? Thanks for any help.

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• How can I save the content of an XDocument object as it is without parsing the hexadecimal reference

  - by SubPortal

  Is there a way to have an XDocument object save its content and keeps the hexadecimal references as they are without parsing them? Thank you for any help.

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• why tempspace results here??

  - by SubPortal

  if we supposed that "A.B." is a value for an xml element called given-names the following code converts this value to "A.tempspacetempspaceB." instead of "A. B." foreach (XElement initial in doc.XPathSelectElements("//given-names")) { string v = initial.Value.Replace(".", ". ").TrimEnd(' '); initial.SetValue(v); } So why tempspace comes here instead of literal space?? thank you for any help.

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