[R] minimum from matrix
oarabile at stams.strath.ac.uk
oarabile at stams.strath.ac.uk
Tue May 8 10:50:43 CEST 2007
I have a very large matrix with columns that have some of their
entries as zero
A small example if a=
[,1] [,2] [,3] [,4]
[,1] 0 2 0 0
[,2] 1 3 0 3
[,3] 2 0 3 5
[,4] 0 4 0 0
and what to get the minimum number from each column but that number
should not be zero. If I use apply (a,2,min) I will get a vector of
zeros as the minimum but what I want it for example from column 1 I
should get 1 i.e for all the matrix I should get a vector (1,2,3,3). I
wonder if someone can give an idea on how to go about it.
thanks in advance for your help.
Oarabile
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