Talk:Sorting algorithms/Quicksort

Task statement is buggy

If array elements are all equal then pseudocode's version of quicksort never returns. A 14:52, 14 July 2008 (UTC)

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Details I'm uncertain on:

• Should it be the in-place form of quicksort, or is it unspecified?
• What is a discrete type?
• Should the program as given work for all arrays with indexes "of any discrete type", or should I pick one "discrete type" and give an example with that?

--Kevin Reid 15:42, 3 October 2007 (MDT)

I'd say follow example of the Bubble Sort page (from which I stole the text). In other words, do whatever is most comfortable in your language, perhaps pointing out the design choices made. --IanOsgood 19:02, 3 October 2007 (MDT)

Algorithm description

Would someone care to add some text describing the Quicksort algorithm? I.e., its worst-case completion time, a pseudocode implementation, what the pivot does, etc. --Short Circuit 03:28, 7 October 2007 (MDT)

UnixPipes solution

It seems to me that the UnixPipes implementation violates the conditions given on Category:UnixPipes: There you find:

It does not include programming problems solved with normal shell by using the control structures available as a part of shell outside of pipelines.

However the quicksort implementation here uses the following shell constructs:

• named function
• while loop
• case statement

So either the example, or the UnixPipes description is wrong. --Ce 15:41, 7 April 2008 (MDT)

The intension in UnixPipes description is to include only those solutions that use the pipelines as computational paradigm. (So as to exclude the imperative solutions in normal shell) Since I do not seem to have captured the intension correctly, I will remove that line from UnixPipelines until I can think of a better way to put it. Thanks for the attention. Rahul 02:36, 8 April 2008 (MDT)

MATLAB... works?

Does MATLAB work? It defines a function named quicksort, but then calls qsort; and the return after the function declaration... if it is like Octave, it makes the program terminate so that the test is never run (maybe the file where you stored the code was called qsort? this could fix something... but doesn't MATLAB complain about the fact that your file is called qsort while your function is quicksort? --ShinTakezou 23:04, 25 June 2009 (UTC)

I've fixed that; I'm used to short names; after entering the code and looking at the whole page, it occurred to me that I should use the same name that everyone else was using. --mecej4 11:53, 26 June 2009 (CDT)