InvFFT
Advanced Analysis Library Only
AnalysisLibErrType InvFFT (double arrayXReal[], double arrayXImaginary[], ssize_t numberOfElements);
Purpose
 |
Note This function has been superseded by CxInvFFTEx. |
Calculates the inverse fast Fourier transform (FFT) of the complex data.
Let X = x + jy be the complex array:
Y = FFT–1(X)
InvFFT performs the operation in place and overwrites the input arrays.
Example Code
/* Generate two arrays with random numbers and calculate the inverse fast Fourier transform. */
double x[256], y[256];
int n;
n = 256;
Uniform (n, 17, x);
Uniform (n, 17, y);
InvFFT (x, y, n);
Parameters
| Input | ||
| Name | Type | Description |
| numberOfElements | ssize_t | Number of elements in the input arrays. |
| Output | ||
| Name | Type | Description |
| arrayX_Real | double [] | On input, the real part of the complex array used to compute the inverse FFT. On output, the real part of inverse FFT. This operation is performed in place, meaning the values in this array are overwritten. |
| arrayX_Imaginary | double [] | On input, the imaginary part of the complex array used to compute the inverse FFT. On output, the imaginary part of inverse FFT. 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