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explanation of routine Four1 in numerical recipe book

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Old   June 8, 2009, 18:26
Default explanation of routine Four1 in numerical recipe book
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Can anybody explain me the routine Four1 in chapter 12 , Fast Fourier Transform of Numerical recipes in Fortran (2nd edition)

i am really lost in the indexing and varaibles used.

like wht is i , j ,m , mmax

if somebody can give an overview of this fortran program, il be really grateful.

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