Re: [R] Transfer a 3-dimensional array to a matrix in R

thank you very much! Both the two methods work well for my data. Best wishes, Chunyu At 2015-10-20 19:48:18, "William Dunlap" wrote: >Or use aperm() (array index permuation): > > array(aperm(x, c(2,1,3)), c(6,3)) > [,1] [,2] [,3] > [1,]17 13 > [2,]4 10 16 >

Re: [R] Transfer a 3-dimensional array to a matrix in R

Hi, Bill was faster than me in suggesting aperm() instead of apply(), however, his solution is still suboptimal. Try to avoid array(), and set the dimensions directly if possible. fn1 <- function(x) { apply(x, 3, t) } fn2 <- function(x) { array(aperm(x, c(2, 1, 3)), c(prod(dim(

Re: [R] Transfer a 3-dimensional array to a matrix in R

Or use aperm() (array index permuation): > array(aperm(x, c(2,1,3)), c(6,3)) [,1] [,2] [,3] [1,]17 13 [2,]4 10 16 [3,]28 14 [4,]5 11 17 [5,]39 15 [6,]6 12 18 Bill Dunlap TIBCO Software wdunlap tibco.com On Tue, Oct 20, 20

Re: [R] Transfer a 3-dimensional array to a matrix in R

> x <- array(1:18, dim=c(3, 2, 3)) > x , , 1 [,1] [,2] [1,]14 [2,]25 [3,]36 , , 2 [,1] [,2] [1,]7 10 [2,]8 11 [3,]9 12 , , 3 [,1] [,2] [1,] 13 16 [2,] 14 17 [3,] 15 18 > apply(x, 3, t) [,1] [,2] [,3] [1,]17 13