Re: [R] inadverted reordering of a df column when it is copied to another df

[Jeff Newmiller]

Reprex confirming Bert:

A <- data.frame( y = 1L:40000L )
B <- data.frame( x = 1L:40000L )
A$x <- B$x
plot(B$x)

#' ![](http://i.imgur.com/cXSFsBh.png)

Care to demonstrate for us, Karl?

https://cran.r-project.org/web/packages/reprex/README.html

On Fri, 17 Mar 2017, Bert Gunter wrote:

You are wrong. No reordering occurs.

Cheers,
Bert

Bert Gunter

"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Fri, Mar 17, 2017 at 8:05 AM, Karl Schilling
<karl.schill...@uni-bonn.de> wrote:

Dear all:

I have two data.frames A and B of the same number of rows (about 40,000). I
realized that when I copy column x from data.frame A to B, the order of this
column  gets changed. This seems to affect only values in rownumbers > ~
35/36,000. It also happens in any of the following three approaches:

A$x <- B$x

x <- B$x (here, x is still in the correct order)
B$x <- x : now x is reordered

B <- cbind(A, B$x)

I am working with Windows7Pro/64bit, R 3.3.3, and RStudio 0.99.903.

Any help would be appreciated.

Best regards

Karl Schilling

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