Re: [R] How to change the class of data?

From: Kenn Konstabel <lebatsnok_at_gmail.com>
Date: Thu, 12 Jun 2008 11:19:45 +0300

Conversion to factor may happen (and often does) when you read in data with read.table(). So one solution may be reading in the same data again in a slightly different way:

read.table(file="mydatafile", as.is=TRUE) # see also ?read.table

You can also specify a class to each column of the data you're about to read in:
read.table(****, colClasses=c("numeric", "factor", "character", "my.funny.class"))

Ad take a look at http://cran.r-project.org/doc/FAQ/R-FAQ.html p. 7.10 for the right answer -- in any case, don't use as.numeric(x)!

Kenn

On Thu, Jun 12, 2008 at 9:24 AM, Qman Fin <finosaur_at_gmail.com> wrote:

> Hi all,
>
> I have some data x, which are actualy consisted of numerical enties. But
> the
> class of this matrix is set to be "factor" by someone else. I used
> "class(x)", it turns out to be "factor". So I can not calculate them.
>
> How can I turn them into numerical data so that I can apply math operations
> on them? Thanks a lot for your help.
>
> Selina
>
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>
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