[R] difference between ifelse and if...else?

[Eric Berger]

ifelse returns the "shape" of the first argument

In your ifelse the shape of "3 > 2" is a vector of length one, so it will
return a vector length one.

Avoid "ifelse" until you are very comfortable with it. It can often burn
you.




On Wed, Dec 13, 2017 at 5:33 PM, jeremiah rounds <roundsjeremiah at gmail.com>
wrote:

> ifelse is vectorized.
>
> On Wed, Dec 13, 2017 at 7:31 AM, Jinsong Zhao <jszhao at yeah.net> wrote:
>
> > Hi there,
> >
> > I don't know why the following codes are return different results.
> >
> > > ifelse(3 > 2, 1:3, length(1:3))
> > [1] 1
> > > if (3 > 2) 1:3 else length(1:3)
> > [1] 1 2 3
> >
> > Any hints?
> >
> > Best,
> > Jinsong
> >
> > ______________________________________________
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> > ng-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>
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>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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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