/usr/include/CLAM/numrecipes_fft.h is in libclam-dev 1.4.0-5.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | /* header for implementation of the Numerical Recipes in C
FFT-Algorithm
Only uses Powers of Two Framesizes
n is length of the array.
data[] starts at data[1] , last element is data[n]
isign =1 forward/ isign =-1 backward transform
*/
#include "DataTypes.hxx"
#include <math.h>
#ifdef __cplusplus
extern "C" {
#endif
void realft(CLAM::TData data[], unsigned long n, int isign);
#ifdef __cplusplus
}
#endif
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