[R] parsing problem

[Ken Knoblauch]

Ken Knoblauch <ken.knoblauch <at> inserm.fr> writes:

> 
> venkata kirankumar <kiran4u2all <at> gmail.com> writes:
> > I am trying to parse a vector for caliculating minimum in that vector the
> > vector having values like
> > 
> > 1        Kontrolle
> > 2          Placebo
> > 3         125mg/kg
> > 4         250mg/kg
> > 5         500mg/kg
> > 6        1000mg/kg
> > hear i tries for comverting it into numeric with using  "as.numaric()"
> >  function
> > but i got values like
> > 5
> > 6
> > 2
> > 3
> > 4
> > 1
> > 
> > can anyone suggest how I will solve it
> > 
> > thanks in advance
> > 
> > regards;
> > kiran
> > 
> Your Kontrolle is being treated as a factor so you
> are seeing only the codes of the levels.  There is
> probably something more elegant, but you need
> something like,
> 
> as.numeric(sapply(with(dd, strsplit(levels(Placebo)[Placebo], "m")), "[[", 1))
> 
I should have specified that when I read in your data, my data frame
looked like this
dd
  X2   Placebo
1  3  125mg/kg
2  4  250mg/kg
3  5  500mg/kg
4  6 1000mg/kg
and
str(dd)
'data.frame':	4 obs. of  2 variables:
 $ X2     : int  3 4 5 6
 $ Placebo: Factor w/ 4 levels "1000mg/kg","125mg/kg",..: 2 3 4  1