[R] How to change the class of data?

[Birgitle]

I have an additional question concerning to this topic.

I usually use something liek that:

read.table(****,  colClasses=c("numeric", "factor", "character",
"my.funny.class"))

but why can I not implement "ordered.factor" in there?

Birgit


Kenn Konstabel wrote:
> 
> 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
>>
>>        [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 


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