TMtxVec.PowerSpectrum Methods

Summary

The power spectrum from object complex values.

Declaration

Function PowerSpectrum(Vec: TMtxVec; VecIndex, Index, Len: integer): TMtxVec;

Description

Calculates the power spectrum from the Vec complex elements [VecIndex]..[VecIndex+Len-1] and store the results in calling object real elements [Index]..[Index+Len-1]. An exception is raised if calling object Complex property is true or if array borders are overrun/underrun.

Declaration

Function PowerSpectrum(Vec: TMtxVec): TMtxVec;

Description

Calculates the power spectrum from the Vec object complex values and stores the results (power spectrum) in the real calling object. Size and Complex properties of the calling object are set implicitly to match Vec object. The spectrum elements are squares of the magnitudes of the complex input elements:

See Also
PhaseSpectrum

Example 1

      var a,b: TVec;
      begin
        CreateIt(a,b);
        try
          a.SetIt(True,[1,2,3,-4]); // a = [1 + 2i, 3 - 4i]
          b.PowerSpectrum(a);   // b = [1*1 + 2*2, 3*3+(-4)*(-4)]
        finally
          FreeIt(a,b);
        end;
      end;