Hi Zhang
Hi all, I have a 4 by 4 matrix, and I want to switch row 2 and row 3
first, then switch column 2 and column 3. Is there an easy way to do
it? The following is a tedious way to get what I want. But I wonder
if there is a way to simplify this.
'> a=matrix(rnorm(16),4,4)
'> b=a[c(2,1,3,4),]
'> a
[,1] [,2] [,3] [,4]
[1,] -0.1954458 0.299055 -1.63830678 -0.9761293
[2,] -1.0558561 -1.225412 0.06439794 0.2919717
[3,] 0.3865482 0.682090 -0.52230467 -0.5961534
[4,] 1.7555946 -0.679426 -0.57409420 1.7552651
'> b
[,1] [,2] [,3] [,4]
[1,] -1.0558561 -1.225412 0.06439794 0.2919717
[2,] -0.1954458 0.299055 -1.63830678 -0.9761293
[3,] 0.3865482 0.682090 -0.52230467 -0.5961534
[4,] 1.7555946 -0.679426 -0.57409420 1.7552651
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