[R] Getting lm() to work with a matrix

[MikSmith]

Hi

I'm fairly new to R and am trying to analyse some large spectral datasets
using stepwise regression (fairly standard in this area). I have a field
sampled dataset, of which a proportion has been held back for validation. I
gather than step() needs to be fed a regression model and lm() can produce a
multiple regression. I had thought something like:

spectra.lm <- lm(response[,3]~spectra.spec[,2:20])

might work but lm() doesnt appear to like being fed a range of columns. I
suspect Ive missed something fairly fundamental here.....

Any help much appreciated

best wishes

mike
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