Message-ID: <971536df0812020819i29291fcax90c930fd0d5fbdcf@mail.gmail.com>
Date: 2008-12-02T16:19:07Z
From: Gabor Grothendieck
Subject: Bug in "transform"?
In-Reply-To: <op.uljl2srrw9ljuw@tir-070312.staff.few.eur.nl>
Try:
cbind(mtcars, t1 = 3, t2 = 4)
On Tue, Dec 2, 2008 at 11:14 AM, Vitalie Spinu <vitosmail at rambler.ru> wrote:
> Dear useRs,
>
> Here is a weird behavior of transform function:
>
> mtcars1<-matcars
> transform(mtcars1,t1=3,t2=4)
> Error in data.frame(`_data`, e[!matched]) :
> arguments imply differing number of rows: 32, 1
>
> instead, this works:
>
> mtcars1$t1<-0
> transform(mtcars1,t1=3,t2=4)
>
> also works if applied in turn:
>
> transform(mtcars1,t1=3)
> transform(mtcars1,t2=4)
>
> I often need to use this for creating new variables in data frame from those
> already present.
> Sorely needed!!
>
> Best,
> Vitalie.
>
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