[R] Find classes for each column of a data.frame

[Daniel Brewer]

Hello,

Is there a simple way to get the class type for each column of a
data.frame?  I am in the situation where I would like to get all the
columns of a data.frame that are factors.

I have tried:
apply(df,2,class)
but all the columns come back as class "character".

Thanks

Dan

-- 
**************************************************************
Daniel Brewer, Ph.D.

Institute of Cancer Research
Molecular Carcinogenesis
Email: daniel.brewer at icr.ac.uk
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The Institute of Cancer Research: Royal Cancer Hospital, a charitable Company Limited by Guarantee, Registered in England under Company No. 534147 with its Registered Office at 123 Old Brompton Road, London SW7 3RP.

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