Hi, Use `drop=FALSE`. b<- matrix(c(2,1,-1,-2),ncol=1) b[1:3,1] #[1] 2 1 -1 b[1:3,1,drop=FALSE] #or b[1:3,,drop=FALSE] # [,1] #[1,] 2 #[2,] 1 #[3,] -1
A.K. hi all, i got a small question tonight. > matrix(b,4)[] [,1] [1,] 2 [2,] 1 [3,] -1 [4,] -2 > dim(matrix(betan,4)) [1] 4 1 As shown, b is a 4X1 matrix. > matrix(betan,4)[1:3,1] [1] 2 1 -1 However, I think the result should be [,1] [1,] 2 [2,] 1 [3,] -1 How could I get the result above? Many thanks, ______________________________________________ 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.
