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;