TMtx.IFFT2D Methods

Summary

Inverse two-dimentional Fast Fourier Transformation from complex to complex.

Class
TMtx

Declaration

Function IFFT2D(Mtx: TMtx; NoScale: boolean = False): TMtx;

Description

Transformation is applied on Mtx matrix and results are saved in the calling matrix. The source matrix must be complex. If source matrix is real, an exception will be raised. The source matrix is not changed. Calling matrix will be complex and will have the same size as the source matrix. NoScale parameter allows the scaling to be turned off.

See Also
FFT2D
FFT2DFromReal
IFFT2DFromReal

Example 1

      var a,b: TMtx;
      begin
        CreateIt(a,b);
        try
          a.SetIt (2,4,False,
                   [1, 2, 3, 4,
                   -5, 6,-7, 8] );
          a.ExtendToComplex;

          b.IFFT2D(a);
          // result will be
          [(1.5, 0), (0, -0.5), (-3.5, 0),  (0, 0.5),
             (1, 0), (-0.5, 0),    (3, 0), (-0.5, 0) ]

        finally
          FreeIt(a,b);
        end;
      end;

Declaration

Function IFFT2D(NoScale: boolean = False): TMtx;

Description

Transformation is applied in-place. Source matrix must be complex. If source matrix is real, an exception will be raised. Result matrix will be complex. Size of the calling matrix is not changed. NoScale parameter allows the scaling to be turned off.

See Also
FFT2D
FFT2DFromReal
IFFT2DFromReal

Example 1

      var a: TMtx;
      begin
        CreateIt(a);
        try
          a.SetIt (2,4,False,
                   [1, 2, 3, 4,
                   -5, 6,-7, 8] );
          a.ExtendToComplex;

          a.IFFT2D;
          // result will be
          [(1.5, 0), (0, -0.5), (-3.5, 0),  (0, 0.5),
             (1, 0), (-0.5, 0),    (3, 0), (-0.5, 0) ]

        finally
          FreeIt(a);
        end;
      end;