Function: involute

INVOLUTE  Involution 
  Usage: finv=involute(f);
         finv=involute(f,dim);

  INVOLUTE(f) will return the involution of f.

  INVOLUTE(f,dim) will return the involution of f along dimension dim.
  This can for instance be used to calculate the 2D involution:

    f=involute(f,1);
    f=involute(f,2);

  The involution finv of f is given by:

    finv(l+1)=conj(f(mod(-l,L)+1));

  for l=0,...,L-1.

  The relation between conjugation, Fourier transformation and involution
  is expressed by:

    conj(dft(f)) == dft(involute(f))

  for all signals f. The inverse discrete Fourier transform can be
  expressed by:

    idft(f) == conj(involute(dft(f)));

Url: http://ltfat.github.io/doc/fourier/involute.html

See also: dft, pconv.

Package: ltfat