Re: [R] help on data frame and matrix

From: Martin Maechler <maechler_at_stat.math.ethz.ch>
Date: Mon 18 Sep 2006 - 06:52:55 GMT

>>>>> "John" == John Kane <jrkrideau@yahoo.ca> >>>>> on Sun, 17 Sep 2006 12:10:19 -0400 (EDT) writes:

    John> --- Finosaur <mouandny@gmail.com> wrote:

>> I am given a data frame, which actually contains a
>> matrix. But I need to convert the data frame into a
>> matrix so that I can use the matrix operators. Can
>> anybody help me out? Thanks a lot.
>>
>>
>> Thaleia

    John> d <- as.matrix(data.frame)

It's (almost always) better to use Dimitri's suggestion, data.matrix(), since that also produces a numeric matrix when the data frame contains factors.

Martin



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