On 01/17/2010 04:05 AM, alessia matano wrote:
Dear all,
I am trying to apply the sapply function on a list, which comes out
from a matrix of 25 rows and two columns, so that each element of the
list, is a two column element. In my function within sapply, say f, I
would like each element of the list to become a vector so that I can
transpose it (in a way to let it be a column vector with two rows) and
then perform a row*column multiplication. But actually it cannot work
it out.
Hi Alessia,
Your description of the problem is a bit hard to understand. It seems
that you want to make a list out of a 25x2 matrix (amat):
amat.list<-list()
for(i in 1:dim(amat)[1]) amat.list[[i]]<-amat[i,]
Then you can sapply on the list:
sapply(amat.list,function(x) x[1]*x[2])
but this seems a very roundabout way to get the row products of the matrix.
Jim
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