Kinoshita: Created page with "DataManip/mrcImage/src/'''fftn''' is API for FFT. == constant == == struct == == API == ===Release memory=== Release the used memory in fftn.c for FFT. extern void fft_fre..."

2014-08-06T04:12:09Z

Created page with "DataManip/mrcImage/src/'''fftn''' is API for FFT. == constant == == struct == == API == ===Release memory=== Release the used memory in fftn.c for FFT. extern void fft_fre..."

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DataManip/mrcImage/src/'''fftn''' is API for FFT.

== constant ==

== struct ==

== API ==
===Release memory===
Release the used memory in fftn.c for FFT.
extern void fft_free (void);

===FFT===
double
extern int fftn (int ndim, const int dims[], double Re[], double Im[],
int isign, double scaling);

float
extern int fftnf (int ndim, const int dims[], float Re[], float Im[],
int isign, double scaling);
Re, Im: Input-Output

==Variables mean==
Variables in These API are used as the following.
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

fftn(API) - Revision history

Kinoshita: Created page with "DataManip/mrcImage/src/'''fftn''' is API for FFT. == constant == == struct == == API == ===Release memory=== Release the used memory in fftn.c for FFT. extern void fft_fre..."