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Dear all,

I am sure it won't be difficult for you!!
I need to calculate the average among variables for the single units  
of my
dataset.
But, while doing it, I need to do not consider some values.
To better explain, think like there are two units and three variables:

     V1    V2     V3
[1]   3     -2      4
[2]  -1      4      1

and you want to calculate the average by row, without considering  
those
negative values:

=> mean(1row) = (3+4)/2
=> mean(2row) = (4+1)/2
perhaps (untested in absence of reproducble example):

apply(dfrm, 1, function(x) mean(x[x>=0]) ) # would also work for a  
matrix object.
Could anyone please give me the commands to do that in R?

Thank you so much

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