Everyone is being too complicated.
c( A[1,2] , A[3,3] )
will do what you ask.
A <- matrix(seq(1,9),nrow=3)
c( A[1,2] , A[3,3] )
[1] 4 9
But I would assume you have some more general
problem in mind, and I do not know if this simple
approach will meet those needs.
-Don
At 3:26 PM +0100 3/12/10, Nils Rüfenacht wrote:
Dear all!
I'm trying to get multiple values from a matrix by using a single command.
Given a matrix A
A <- matrix(seq(1,9),nrow=3,ncol=3)
How can I get e.g. the values A[1,2] = 4 and
A[3,3] = 9 with a single command and without
using any loop? My first idea was to generate a
row- and a column vector for the indices, i.e.
c(1,3) indicating row number 1 (for A[1,2]) and
row number 3 (for A[3,3]) and similar for
column-indices. Then I've tried to call
A[c(1,3),c(2,3)]
but instead of 4 , 9 the result is
[,1] [,2]
[1,] 4 7
[2,] 6 9
Any suggestions?
Regards, Nils
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--
---------------------------------
Don MacQueen
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062
m...@llnl.gov
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