g_fft_re(G;S;O;XR;XI)

Returns the real part of the fast Fourier transform (FFT) on complex data.

Syntax

g_fft_re(G;S;O;XR;XI)

Input

Argument Type Description
G any A space- or comma-separated list of column names

Rows are in the same group if their values for all of the columns listed in G are the same.

If G is omitted, all rows are considered to be in the same group.

If any of the columns listed in G contain N/A, the N/A value is considered a valid grouping value.
S integer The name of a column in which every row evaluates to a 1 or 0, which determines whether or not that row is selected to be included in the calculation

If S is omitted, all rows will be considered by the function (subject to any prior row selections).

If any of the values in S are neither 1 nor 0, an error is returned.
O integer A space- or comma-separated list of column names that determine the row order within a particular group

If O is omitted, the order is the current display order of the table.

If any of the values in O are N/A, an error is returned.
XR integer or decimal The name of a column denoting the real part of the data

Either XR or XI (but not both) may be also be a constant (e.g. 0) or omitted (equivalent to specifying 0).
XI integer or decimal The name of a column denoting the imaginary part of the data

Either XR or XI (but not both) may be also be a constant (e.g. 0) or omitted (equivalent to specifying 0).

Return Value

The g_fft_re(G;S;O;XR;XI) function returns the real part of the transformed data.

Data to be Fourier-transformed should not contain any N/A. Any N/A in the data returns N/A as the result for the entire group.