Hi Eric,
I was hoping to avoid post-processing the result of the within call.
Sebastien
From: "Eric Berger" <ericjber...@gmail.com>
To: "Sebastien Bihorel" <sebastien.biho...@cognigencorp.com>
Cc: "R mailing list" <r-help@r-project.org>
Sent: Wednesday, July 3, 2019 8:13:22 AM
Subject: Re: [R] Control the variable order after multiple declarations using
within
Hi Sebastien,
Your 'within' command returns a dataframe. So without changing the call to
within you have some options such as:
df2 <- within(df, {b<-a*2; c<-b*3})
df2[c("a","b","c")]
OR
within(df, {b<-a*2; c<-b*3})[c("a","b","c")]
OR
within(df, {b<-a*2; c<-b*3})[c(1,3,2)]
HTH,
Eric
On Wed, Jul 3, 2019 at 10:14 AM Sebastien Bihorel < [
mailto:sebastien.biho...@cognigencorp.com | sebastien.biho...@cognigencorp.com
] > wrote:
Hi,
The within function can be used to modify data.frames (among other objects).
One can even provide multiple expressions to modify the data.frame by more than
one expression. However, when new variables are created, they seem to be
inserted in the data.frame in the opposite order they were declared:
> df <- data.frame(a=1)
> within(df, {b<-a*2; c<-b*3})
a c b
1 1 6 2
Is there a way to insert the variables in an order consistent with the order of
declaration (ie, a, b, c)?
Thanks
Sebastien
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