[R] field index given name.

[tdm]

Hi,

How do I access the index number of a field given I only know the field
name?

eg - I want to set the probability of the field 'species' higher than the
other fields to use in sampling.

> colprob <- array(dim=NCOL(iris))
> for(i in 1:NCOL(iris)){colprob[i]=0.5}
> colprob[iris$species] = 1 #this doesn't work
> colprob
[1] 0.5 0.5 0.5 0.5 0.5





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