[jira] Created: (MATH-205) Mathematical error in comment for FastCosineTransformer

Mathematical error in comment for FastCosineTransformer
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                 Key: MATH-205
                 URL: https://issues.apache.org/jira/browse/MATH-205
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 1.2
            Reporter: Roman Werpachowski
            Priority: Trivial


The formula in the comments for transform() method of FastCosineTransformer has the form:

F_n = (1/2) [f_0 + (-1)^n f_N] + \Sum_{k=0}^{N-1} f_k \cos(\pi nk/N)

This is incorrect and should be

F_n = (1/2) [f_0 + (-1)^n f_N] + \Sum_{k=1}^{N-1} f_k \cos(\pi nk/N)

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