[R] tapply function with NA

[vincent.deluard]

Hi R users,

I have a matrix "m" of the type:

m
       X4.20.2010 X4.19.2010   X4.16.2010
[1,]  0.008319468 0.00000000 -0.008250825
[2,]  0.005574136 0.01816118  0.073081608
[3,] -0.047830688 0.01612903 -0.030239833
[4,]           NA         NA           NA
[5,]  0.008746356 0.02848576 -0.025566107
[6,] -0.007990868 0.00000000 -0.026666667

I want to get the sum of each column. Normally I would do:

apply(m,2,sum)

but I get:

> apply(m,2,sum)
X4.20.2010 X4.19.2010 X4.16.2010 
        NA         NA         NA 

This is because of the presence of "NA" in m. How do you the equivalent of 
> sum(m[1:6,1],na.rm=TRUE)
using apply?

Many thanks!
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