Re: [R] tensor product of equi-spaced B-splines in the unit square

dear all, I apologize for a second post on the same subject. I still have the problem. I'm going to describe the problem in a different setting: I have 3 matrix A,B,W such that dim(A) = c(n,M) dim(B) = c(n,M) dim(W) = c(M,M) what I'm searching for is an efficient computation of vector R,

[R] tensor product of equi-spaced B-splines in the unit square

Dear all, I need to compute tensor product of B-spline defined over equi-spaced break-points. I wrote my own program (it works in a 2-dimensional setting) library(splines) # set the break-points Knots = seq(-1,1,length=10) # number of splines M = (length(Knots)-4)^2 # short cut to