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
______________________________________________
R-help@r-project.org 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.
