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GABFRAMEDIAG - Diagonal of Gabor frame operator

Usage

d=gabframediag(g,a,M,L);
d=gabframediag(g,a,M,L,'lt',lt);

Input parameters

g Window function.
a Length of time shift.
M Number of channels.
L Length of transform to do.
lt Lattice type (for non-separable lattices).

Output parameters

d Diagonal stored as a column vector

Description

gabframediag(g,a,M,L) computes the diagonal of the Gabor frame operator with respect to the window g and parameters a and M. The diagonal is stored a as column vector of length L.

The diagonal of the frame operator can for instance be used as a preconditioner.