[R] matrix calculation?
Cunningham Kerry
kerryrekky at yahoo.com
Wed Sep 14 05:34:18 CEST 2005
Hi,
I am wondering if anybody has a simpler solution to
calculate the
following:
> ma
a b
[1,] 1 4
[2,] 2 3
[3,] 3 2
[4,] 4 5
> pa
[,1] [,2] [,3] [,4]
a 1 2 3 4
b 4 3 2 5
> diag(ma%*%pa)
[1] 17 13 13 41
I only want to calculate the product of the row of the
first matrix and
the corresponding column of the second matrix (instead
of other
columns). However, what I did was to multiply these
two and then extract
the diagonal components. Is there a simpler way to do
this in R? (ma and pa may not be the same matrix.)
Thanks!
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