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)
> a
[,1] [,2] [,3] [,4]
[1,] 0.33833811 -0.9422273 -0.06181611 -1.8346134
[2,] -0.68167996 0.2004836 0.71079887 -1.1590184
[3,] 0.07811688 0.1338694 -1.61262688 0.2988365
[4,] 0.21869786 -1.6356661 -0.13694344 -1.2121355
> b=a
> b[2,]=a[3,]
> b[3,]=a[2,]
> b
[,1] [,2] [,3] [,4]
[1,] 0.33833811 -0.9422273 -0.06181611 -1.8346134
[2,] 0.07811688 0.1338694 -1.61262688 0.2988365
[3,] -0.68167996 0.2004836 0.71079887 -1.1590184
[4,] 0.21869786 -1.6356661 -0.13694344 -1.2121355
> c=b
> c[,2]=b[,3]
> c[,3]=b[,2]
> c
[,1] [,2] [,3] [,4]
[1,] 0.33833811 -0.06181611 -0.9422273 -1.8346134
[2,] 0.07811688 -1.61262688 0.1338694 0.2988365
[3,] -0.68167996 0.71079887 0.2004836 -1.1590184
[4,] 0.21869786 -0.13694344 -1.6356661 -1.2121355
Sincerely,
Yanwei Zhang
Department of Actuarial Research and Modeling
Munich Re America
Tel: 609-275-2176
Email: [EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>
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