[R] Adding rows based on column value

[Bansal, Vikas]

I have tried that also.But it is showing this error-

 aggregate(file[,3:6], by = list(file[,2]), FUN = sum)

Error in FUN(X[[1L]], ...) : invalid 'type' (character) of argument



Thanking you,
Warm Regards
Vikas Bansal
Msc Bioinformatics
Kings College London
________________________________________
From: r-help-bounces at r-project.org [r-help-bounces at r-project.org] On Behalf Of Ben Bolker [bbolker at gmail.com]
Sent: Thursday, July 14, 2011 6:24 PM
To: r-help at stat.math.ethz.ch
Subject: Re: [R] Adding rows based on column value

Bansal, Vikas <vikas.bansal <at> kcl.ac.uk> writes:

> I am using this-
>
> aggregate(x = file[,3:6], by = list(file[,2]), FUN = "sum")
>

  Better, although still not reproducible (please *do* read the posting
guide -- it is listed at the bottom of every R list post and is the
*first* google hit for "posting guide" (!); search for
"Examples").  What about removing the quotation marks around "sum"?

  aggregate(x = file[,3:6], by = list(file[,2]), FUN = sum)


> but I think this is not a right way.
> Because we cannot use "sum" to add.That is
>  why I was asking for help.

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