fftshift

1 Description
2 Syntax
3 Parameters
4 Return
5 Example
6 See Also

Description

Shift FFT results or frequency.

Note that the output for this function are complex values, so when doing calculation on data columns, you need to set column data type to complex prior to set column formula. For details, see the example section below.

Syntax

vector<complex> fftshift(vector<complex> cx)

Parameters

The FFT complex results

Return

Return a shifted vector.

Example

// Import the signal data
string fname$ = system.path.program$ + "Samples\Signal Processing\fftfilter1.DAT";
impASC fname:=fname$;
 
// Add a new column to store the shifted FFT complex result
wks.addcol();

// Set data type to complex 16 in advance
wks.col3.numerictype = 11;

// Use fftshift and fftc to calculate
col(C) = fftshift(fftc(col(B)));