Re: [R] Build Design Matrix with avoiding loops

help.search("design matrix") will lead you to ?model.matrix ... Gildas Mazo wrote: Dear R users, I'd like to build a simple design matrix in a efficient way. I naively wrote the code below. n = 15 k = 3 nbPerGrp = c(5,5,5) xT <- list() for (i in 1:k){ xT[[i]] <- rep(0, k)

Re: [R] Build Design Matrix with avoiding loops

Subject: [R] Build Design Matrix with avoiding loops Dear R users, I'd like to build a simple design matrix in a efficient way. I naively wrote the code below. n = 15 k = 3 nbPerGrp = c(5,5,5) xT <- list() for (i in 1:k){ xT[[i]] <- rep(0, k) xT[[i]][i] &l

[R] Build Design Matrix with avoiding loops

Dear R users, I'd like to build a simple design matrix in a efficient way. I naively wrote the code below. n = 15 k = 3 nbPerGrp = c(5,5,5) xT <- list() for (i in 1:k){ xT[[i]] <- rep(0, k) xT[[i]][i] <- 1 } X <- matrix(nrow = n, ncol = k) #design matrix for (i in 1