?? fftn.h
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/*--------------------------------*-C-*---------------------------------* * File: * fftn.h * ---------------------------------------------------------------------* * Re[]: real value array * Im[]: imaginary value array * nTotal: total number of complex values * nPass: number of elements involved in this pass of transform * nSpan: nspan/nPass = number of bytes to increment pointer * in Re[] and Im[] * isign: exponent: +1 = forward -1 = reverse * scaling: normalizing constant by which the final result is *divided* * scaling == -1, normalize by total dimension of the transform * scaling < -1, normalize by the square-root of the total dimension * * ---------------------------------------------------------------------- * See the comments in the code for correct usage! */#ifndef _FFTN_H#define _FFTN_Hextern void fft_free (void);/* double precision routine */extern int fftn (int ndim, const int dims[], double Re[], double Im[], int isign, double scaling);/* float precision routine */extern int fftnf (int ndim, const int dims[], float Re[], float Im[], int isign, double scaling);#endif /* _FFTN_H */
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