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WILFRAMEDIAG - Diagonal of Wilson and WMDCT frame operator

Usage

d=wilframediag(g,M,L);

Input parameters

g Window function.
M Number of channels.
L Length of transform to do.

Output parameters

d Diagonal stored as a column vector

Description

wilframediag(g,M,L) computes the diagonal of the Wilson or WMDCT frame operator with respect to the window g and number of channels 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.