[R] Row count on criteria

[Filoche]

Hi everyone.

I would like to count number of row higher than 0 for each column in a
dataframe.

For instance, I was using something like:

YY = replicate(5, rnorm(10)) 
apply(YY,2,">",0)

This give me a boolean matrix, but how to have the count of row with numbers 
> 0 by column?

Thank in advance,
Phil

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