Hi, I have created a list object like that : x = vector("list") for (i in 1:5) x[[i]] = rnorm(2) x
Now I want to do two things : 1. for each i, I want to do following matrix calculation : t(x[[i]]) %*% x[[i]] i.e. for each i, I want to get a 2x2 matrix 2. Next I want to get x[[1]] + x[[2]] +.... I did following : res=vector("list"); res = sapply(x, function(i) t(x[[i]]) %*% x[[i]]) However above syntax is not giving desired result. Any suggestion please? -- View this message in context: http://www.nabble.com/A-question-on-operation-on-list-tp24612796p24612796.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.