fusion of two matrices (numerical and logical)
A is not a matrix. I presume you meant B. If so:
B[!C] <- 0 B
[,1] [,2] [,3] [,4] [1,] 1 6 0 0 [2,] 2 0 0 0 [3,] 3 0 0 0 [4,] 4 0 0 19 [5,] 5 0 0 0 Cheers, Bert On Sat, Sep 5, 2020 at 11:18 AM Vivek Sutradhara <viveksutra at gmail.com> wrote:
Hi
I would like to get help in combining two matrices. Here is my example:
A <- 1:20
B <- matrix(A,nrow=5,ncol=4)
# B is a numerical matrix
C <- B<7
C[4,4] <- TRUE
# C is a logical matrix
# if I combine A and C, I get a vector
D1 <- A[C==TRUE]
D1
D2 <- A[C==FALSE]
D2
I want to get a matrix with the same dimensions as matrix A. At the
coordinates given by the vector D1, I want to retain the values in
matrix A. At the locations in D2, I want a zero value.
I want to know if I can do this without using any loops.
Thanks, Vivek
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