2.1.22.2.1.28 fft_fft_cosine

1 Description
2 Syntax
3 Parameters
4 Return
5 Examples
6 Remark
7 See Also
8 Header to Include
9 Reference

Description

computes the discrete Cosine transform of iSize real data values.

Syntax

int fft_fft_cosine( int iSize, double * vSig )

Parameters

iSize: [input] the number of data values.
vSig: [modify] the original signal to be transformed, and the result of the transform

Return

Returns 0 for success or error codes for failure.

Examples

EX1

//Assume the current Worksheet has 2 columns, the first column 
//contains 8 data. This piece of code computes the discrete 
//Fourier cosine transform of n real data values. The result
//is output into the second column.

#include <..\originlab\fft.h>

void TEST_fft_fft_cosine()
{
    int n= 8, success;
    Worksheet wks = Project.ActiveLayer();
    if(wks)
    {
        Dataset xx(wks, 0);
        Dataset dx(wks, 1);
        dx.SetSize(n);            
    
        vector x = xx;
        success = fft_fft_cosine(n, x);
        //Output the result into the second column.
        dx = x;
    }
}