This produces a list whose ith element is matrix Xi : X4 <- replace(matrix(0, 4, 4), cbind(4, 4), 1) lapply(1:4, function(i) replace(X4, cbind(i,i), 1))
On 10/4/06, Ya-Hsiu Chuang <[EMAIL PROTECTED]> wrote: > Hi, > > I am trying to create matrices X's based on one indicator variable, r. > > Given a 4 x4 matrix X= [ 0,0,0,0 > 0,0,0,0 > 0,0,0,0 > 0,0,0,1] > r= c(0, 0, 0, 1) > > I'd like to create separate matrices where > when i = 1, X= [1,0,0,0 > 0,0,0,0 > 0,0,0,0 > 0,0,0,1] > > when i =2 , X= [0,0,0,0 > 0,1,0,0 > 0,0,0,0 > 0,0,0,1] > > when i = 3, X= [0,0,0,0 > 0,0,0,0 > 0,0,1,0 > 0,0,0,1] > > when i = 4, X= [0,0,0,0 > 0,0,0,0 > 0,0,0,0 > 0,0,0,1] > > Any suggestions would be very appreciated. > > Thanks \ ______________________________________________ R-help@stat.math.ethz.ch 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.
