R help - May 2012 - Calling on certina columns

I'm trying to run a regression on certain columns.  The columns are named
"Cat_1", "Cat_2" etc.  Is there a way to call upon all of
the columns that
contain "Cat"?

Thanks,

Chris

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On May 23, 2012, at 5:47 PM, Chris Burns wrote:
> I'm trying to run a regression on certain columns.  The columns are  
> named
> "Cat_1", "Cat_2" etc.  Is there a way to call upon all
of the
> columns that
> contain "Cat"?
>
lm( y ~ . , data=dfrm[, c("y", grep("Cat", names(dfrm),
value=TRUE) ] )

OR:

lm (y ~ . , data=dfrm[,  grep("Cat|y", names(dfrm) ) ]
)
>
-- 

David Winsemius, MD
West Hartford, CT