[R] to modify a matrix
Mitsuo Igarashi
mitsu5 at ruby.famille.ne.jp
Sat Feb 8 16:05:06 CET 2003
Hi All.
I am quite a newbie to R.
This is a next basic question.
I have a matrix;
> x <- matrix(1:10.,5)
> x
[,1] [,2]
[1,] 1 6
[2,] 2 7
[3,] 3 8
[4,] 4 9
[5,] 5 10
I like to get a modified matrix as follows;
[,1] [,2]
[1,] 1 6
[2,] 2 7
[3,] 3 8 * 5 -> 40
[4,] 4 9
[5,] 5 10
The following expression does not work.
if (x[x[,1]==3]) x[x[,1]==3],2]*5
How can I obtain a right expresion to get a modified matrix?
Thanks in advance for help.
-------========--------
mitsu5
mitsu5 at ruby.famille.ne.jp
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