Re: [R] Adding a numeric to all values in the dataframe

From: John Kane <jrkrideau_at_yahoo.ca>
Date: Fri, 20 May 2011 18:50:32 -0700 (PDT)


I didn't quite understand your first post. Was it intended to assure that the operation was only on numeric variables? Otherwise I don't see the differnce in applying the operation to a totally numeric data.frame and a matrix.

> From: Bill.Venables_at_csiro.au <Bill.Venables_at_csiro.au>
> Subject: Re: [R] Adding a numeric to all values in the dataframe
> To: Bill.Venables_at_csiro.au, ramya.victory_at_gmail.com, r-help_at_r-project.org
> Received: Friday, May 20, 2011, 9:37 PM
> Oops
>
> The first line of my template should use data.matrix()
> rather than data.frame()
>
> data.matrix() is guaranteed to return a numerical matrix
> from a data frame, making arithmetic always possible.
>
> Bill Venables.
>
> ________________________________________
> From: Venables, Bill (CMIS, Dutton Park)
> Sent: 20 May 2011 14:30
> To: 'Ramya'; 'r-help_at_r-project.org'
> Subject: RE: [R] Adding a numeric to all values in the
> dataframe
>
> For that kind of operation (unusual as it is) work with
> numeric matrices.  When you are finished, if you still
> want a data frame, make it then, not before.
>
> If your data starts off as data frame to begin with, turn
> it into a matrix first.  E.g.
>
> myMatrix <- data.frame(myData)
> myMatrix2 <- myMatrix + 2
> myData2 <- data.frame(myMatrix2)
>
> Bill Venables.
>
> -----Original Message-----
> From: r-help-bounces_at_r-project.org
> [mailto:r-help-bounces_at_r-project.org]
> On Behalf Of Ramya
> Sent: Friday, 20 May 2011 1:54 PM
> To: r-help_at_r-project.org
> Subject: [R] Adding a numeric to all values in the
> dataframe
>
> Hi there
>
> I just want to add 2 to all the values in dataframe.
>
> I tried using sapply but it seem to die all the time.
>
> Any help would be appreciated.
>
> Thanks
> Ramya
>
> --
> View this message in context: http://r.789695.n4.nabble.com/Adding-a-numeric-to-all-values-in-the-dataframe-tp3537594p3537594.html
> Sent from the R help mailing list archive at Nabble.com.
>
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>



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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. Received on Sat 21 May 2011 - 01:52:34 GMT

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