Vector.FFTFromReal Method (TMtxVec, integer, integer, integer)

The forward Fast Fourier Transformation (FFT) from real to complex.

Pascal

function FFTFromReal(const Vec: TMtxVec; VecIndex: integer; Index: integer; Len: integer): TMtxVec; overload;

Description

Calculate the FFT from real Vec elements [VecIndex]..[VecIndex+Len-1] and store the results in the calling object elements [Index]..[Index+Len-1]. The Len parameter must not be a power of two. Size and Complex properties of the calling object must be set explicitly. An exception is raised if ConditionCheck is True and Vec is not complex or if array borders are overrun.

Notes

This is the indexed version of the FFT routine . Look there for more information on FFT parameters and storage requirements.