How to set multiple matrix elements at a time in R? -


i have sparse representation of matrix m below:

1 3 6  2 5 7  5 4 10

which means m[1,3]=6, m[2,5]=7, , m[5,4]=10. if want generate regular 2d matrix representation, there way set existing elements of 2d matrix m @ once? don't want go on index pairs in loop, because there thousands of such pairs (although there 3 of them in example above).

i tried m[c(1,2,5),c(3,5,4)]=c(6,7,10), sets m[1,5]=6 , m[1,4]=6 besides m[1,3]=6.

you "sparse" matrix:

library(matrix) m <- sparsematrix(i = c(1, 2, 5),                   j = c(3, 5, 4),                   x = c(6, 7, 10),                   dims = c(5, 5)) #5 x 5 sparse matrix of class "dgcmatrix" # #[1,] . . 6  . . #[2,] . . .  . 7 #[3,] . . .  . . #[4,] . . .  . . #[5,] . . . 10 .

if need base r matrix:

as.matrix(m) #     [,1] [,2] [,3] [,4] [,5] #[1,]    0    0    6    0    0 #[2,]    0    0    0    0    7 #[3,]    0    0    0    0    0 #[4,]    0    0    0    0    0 #[5,]    0    0    0   10    0

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