/*--------------------------------*-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 */