[R] count element in column

[Liaw, Andy]

Something like colSums(res < 0), which works for any number of columns.

Andy

> From: Frederic renaud
> 
> Hi,
> I 've a matrix n*1 (thus a column) and I would like to
> count the number of negative element inside.
> Can you help me?
> Thanks!
> 
> eg:
>  res[,1]= 1
>           -3
>           -1
> 
> How obtain the number 2 (number of negative-element)?
> 
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