Hello,
Try the following.
a[as.logical(j), as.logical(j)]
# or
b <- a[as.logical(j), ]
t(b)[as.logical(j), ]
Hope this helps,
Rui Barradas
Em 26-10-2014 18:35, Steven Yen escreveu:
Dear
I am interested in selecting rows and columns of a matrix with a
criterion defined by a binary indicator vector. Let matrix a be
> a<-matrix(1:16, 4,4,byrow=T)
> a
[,1] [,2] [,3] [,4]
[1,] 1 2 3 4
[2,] 5 6 7 8
[3,] 9 10 11 12
[4,] 13 14 15 16
Elsewhere in Gauss, I select the first and third rows and columns of a
by defining a column vector j = [1,0,1,0]. Then, select the rows of a
using j, and then selecting the rows of the transpose of the resulting
matrix using j again. I get the 2 x 2 matrix as desired. Is there a way
to do this in R? below are my Gauss commands. Thank you.
---
j
1
0
1
0
a=selif(a,j); a
1 2 3 4
9 10 11 12
a=selif(a',j); a
1 9
3 11
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