InvFHT
Advanced Analysis Library Only
AnalysisLibErrType InvFHT (double array[], ssize_t numberOfElements);
Purpose
Calculates the inverse fast Hartley transform (FHT) using the following formula:
| where | Xi is the ith point of the inverse FHT |
| and cas(x) = cos(x) + sin(x) |
InvFHT performs the operation in place and overwrites the input array.
Example Code
/* Generate an array with random numbers and calculate its inverse fast Hartley transform. */
double x[256];
int n;
n = 256;
Uniform (n, 17, x);
InvFHT (x, n);
Parameters
| Input | ||
| Name | Type | Description |
| numberOfElements | ssize_t | Number of elements in the input array. Default Value: 1024 Valid Values: Powers of 2. |
| Output | ||
| Name | Type | Description |
| array | double [] | On input, the array used to compute the inverse FHT. On output, the inverse FHT. 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. |
Additional Information
Library: Advanced Analysis Library
Include file: analysis.h
LabWindows/CVI compatibility: LabWindows/CVI 3.1 and later