Local cosine transforms |
lct(a,n,f) Returns the n-level local cosine packet table for the data array a using data taper function f.
ilct(w,n,b,f) If w is an array of cosine packet coefficients constructed from a cosine packet table with n levels, returns the inverse cosine packet transform with respect to the basis specified by b, using data taper function f.
cpt(a,n) Returns the n-level local cosine packet table for the data array a.
icpt(w,n,b) If w is an array of cosine packet coefficients constructed from a cosine packet table with n levels, returns the inverse cosine packet transform with respect to the basis specified by b.
The argument n used in icpt must be the n used in lct. (This may be larger than the number of levels present in the basis b.) ilct also requires that you specify the taper which was used in lct.
cpt and icpt use the default "trig" data taper.