d=wilframediag(g,M,L);
g | Window function. |
M | Number of channels. |
L | Length of transform to do. |
d | Diagonal stored as a column vector |
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.