[R] count element in column

[Andy Bunn]

How about this?
length(res[res < 0, 1])
HTH, Andy

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch]On Behalf Of Frederic renaud
> Sent: Wednesday, January 05, 2005 11:08 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] count element in column
> 
> 
> 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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