FHT

Advanced Analysis Library Only

AnalysisLibErrType FHT (double array[], int numberOfElements);

Purpose

Calculates the Fast Hartley Transform (FHT) using the following formula:

where Xk is the kth point of the FHT
and cas(k) = cos(k) + sin(k)

FHT can perform the operation in place and overwrite the input array.

Example

/* Generate an array with random numbers and calculate its Fast Hartley Transform. */
double x[256];
n;
n = 256;
Uniform (n, 17, x);
FHT (x, n);

Parameters

Input
Name Type Description
numberOfElements integer Number of elements in the input array.

Default Value: 1024.

Valid Values: powers of 2.
Output
Name Type Description
array double-precision array On input, the values used to compute the FHT.

On output, the Fast Hartley Transform.

This operation is performed in place, meaning the values in this array are overwritten.

Return Value

Name Type Description
status AnalysisLibErrType A value that specifies the type of error that occurred. Refer to analysis.h for definitions of these constants.