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.
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