d=nsgabframediag(g,a,M);
g | Window function. |
a | Length of time shift. |
M | Number of channels. |
d | Diagonal stored as a column vector |
nsgabframediag(g,a,M) computes the diagonal of the non-stationary Gabor frame operator with respect to the window g and parameters a and M. The diagonal is stored as a column vector of length L=sum(a).
The diagonal of the frame operator can for instance be used as a preconditioner.