[R] count element in column

[Berton Gunter]

....


> How about this?
> length(res[res < 0, 1])
> HTH, Andy
> 
or simply sum(res<0) .

For R beginners: This works because the logical res<0 vector is
automatically coerced to a numeric vector of 0's and 1's by sum(). 


-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA



> > -----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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> 
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