Is the following sort of what you want?
> y =
factor(c("ff","f","m","mm","fm","mf","ffm","mmf","mmm","fff"))
> levels(y) <- substring(levels(y), 1, 1)
> y
[1] f f m m f m f m m f
Levels: f m
Andy
> From: Oleg Bartunov
>
> Hello,
>
> is't possible to specify pattern in levels ?
>
> >
y=c("ff","f","m","mm","fm","mf","ffm","mmf","mmm","fff");
> > factor(y)
> [1] ff f m mm fm mf ffm mmf mmm fff
> Levels: f ff fff ffm fm m mf mm mmf mmm
>
> I want to specify levels using regexp ("f.*","m.*") or
use some
> another method. So, I could have 2 levels, say, F and M, where
> F means everything beginning from 'f' and M - from 'm'.
>
> Something like cut() for numerical data.
>
> Regards,
> Oleg
> _____________________________________________________________
> Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
> Sternberg Astronomical Institute, Moscow University (Russia)
> Internet: oleg at sai.msu.su, http://www.sai.msu.su/~megera/
> phone: +007(095)939-16-83, +007(095)939-23-83
>
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