in reply to Improving the Nested For Loop

In addition what the fellow monks advised above already, you do calculate the mean and the standard deviation of each category many times. You can save some time by doing it only once and store the results (e.g. while loading the data). You could also standardize your data (by subtracting the mean and dividing by the standard deviation) which also takes out the repeated calculation of mean and standard deviation in your nested loop.

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Re^2: Improving the Nested For Loop
by CountZero (Bishop) on Sep 02, 2014 at 21:31 UTC
    The Memoize module would be a good and easy way to avoid repeated calculations.

    CountZero

    A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

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