![]() |
![]() |
Gwyddion Data Processing Library Reference Manual | ![]() |
|
---|---|---|---|---|
enum GwyWindowingType; gint gwy_fft_hum (gint dir, gdouble *re_in, gdouble *im_in, gdouble *re_out, gdouble *im_out, gint n); void gwy_fft_window (gdouble *data, gint n, GwyWindowingType windowing);
typedef enum { GWY_WINDOWING_NONE = 0, GWY_WINDOWING_HANN = 1, GWY_WINDOWING_HAMMING = 2, GWY_WINDOWING_BLACKMANN = 3, GWY_WINDOWING_LANCZOS = 4, GWY_WINDOWING_WELCH = 5, GWY_WINDOWING_RECT = 6 } GwyWindowingType;
Selection of windowing applied before FFT (if requested).
gint gwy_fft_hum (gint dir, gdouble *re_in, gdouble *im_in, gdouble *re_out, gdouble *im_out, gint n);
Performs FST algorithm.
dir : |
direction (1/-1) |
re_in : |
real part of input data |
im_in : |
imaginary part of input data |
re_out : |
real part of output data |
im_out : |
imaginary part of output data |
n : |
number of data points |
Returns : | zero at success. |
void gwy_fft_window (gdouble *data, gint n, GwyWindowingType windowing);
Multiplies data by given window.
data : |
data values |
n : |
number of data values |
windowing : |
method used for windowing |