[R] How to define new matrix based on an elementary row oper

[David Winsemius]

On Aug 28, 2010, at 11:32 AM, Cuckovic Paik wrote:

>
> Thank you very much, David;
> for row swapping: R2<==>R3
>
>> A=diag(1:4)
>> A
>     [,1] [,2] [,3] [,4]
> [1,]    1    0    0    0
> [2,]    0    2    0    0
> [3,]    0    0    3    0
> [4,]    0    0    0    4
>> A1=A[c(1,3,2,4),]
>> A1
>     [,1] [,2] [,3] [,4]
> [1,]    1    0    0    0
> [2,]    0    0    3    0
> [3,]    0    2    0    0
> [4,]    0    0    0    4

Yes, obviously. My point was illustration of construction of  
equivalent matrix operators (which was what I assumed was the  
educational goal motivating your insistence on a one step process for  
a translation operation, but maybe your goal was merely compact code.)  
The manipulation of indices does not generalize to rotations very  
well, either.

-- 
David.