Hi,
is.matrix(a) #[1] TRUE #You don't need t(matrix(a)) t(a) # [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] #[1,] 1 2 3 4 5 6 7 8 9 10 #[2,] 11 12 13 14 15 16 17 18 19 20 #[3,] 21 22 23 24 25 26 27 28 29 30 is.matrix(t(a)) #[1] TRUE str(t(a)) # int [1:3, 1:10] 1 11 21 2 12 22 3 13 23 4 ... str(t(matrix(a)) ) # int [1, 1:30] 1 2 3 4 5 6 7 8 9 10 ... A.K. ----- Original Message ----- From: Andras Farkas <[email protected]> To: "[email protected]" <[email protected]> Cc: Sent: Wednesday, November 7, 2012 6:50 AM Subject: [R] simple coversion of matrix rows to matrix columns Dear All I would like to convert matrix rows to columns. I am thinking the t() function should help, but am having a hard time converting the matrix into the dimensions I would like them to. Example: a <-matrix(c(1:30),ncol=3) gives me:[,1] [,2] [,3] [1,] 1 11 21 [2,] 2 12 22 [3,] 3 13 23 [4,] 4 14 24 [5,] 5 15 25 [6,] 6 16 26 [7,] 7 17 27 [8,] 8 18 28 [9,] 9 19 29 [10,] 10 20 30 I would like to convert the above into a matrix that looks like this with 3 rows and 10 columns: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 I have tried : b <-t(matrix(a)) but I am getting a 1X30 double matrix. I also Tried to specify b <-t(matrix(a),byrow=TRUE,ncol=10) but that does not help either... apreciate your help, Andras [[alternative HTML version deleted]] ______________________________________________ [email protected] 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. ______________________________________________ [email protected] 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.
