Hello, I would like to compute a weighted combination of matrices.
I have a number of matrices, arranged in a 3D-array, say: z = array(rep(1:3,c(9,9,9)),c(3,3,3)) so that z[,,1] is my first matrix, and z[,,2] and z[,,3] the second and third one, and a vector of coefficients: w = rep(1/3,3) I would like to compute: w[1]* z[,,1] + w[2]*z[,,2] + w[3]*z[,,3] I could of course do this using a for() loop, but would like to know if there is a way to do it in a "vectorized" manner, or any other way that is likely to result in faster computation. Any hint ? Thank you very much in advance, YNOEL ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
