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

[William Dunlap]

But note that m:n does not always produce an integer sequence.  It does when
the output can be accurately represented as an integer sequence, it
does not care
if the inputs were integer or numeric.
  > class( (2^31-10):(2^31-2) )
  [1] "integer"
  > class( (2^31-10):(2^31) ) # biggest integer is as.integer(2^31-1)
  [1] "numeric"
  > str(1.7:3.7)
   num [1:3] 1.7 2.7 3.7
  > str(1.0:3.0)
   int [1:3] 1 2 3
Bill Dunlap
TIBCO Software
wdunlap tibco.com


On Fri, Mar 17, 2017 at 10:53 AM, Rui Barradas <ruipbarradas at sapo.pt> wrote:
> Hello,
>
> Not an answer to the OP's statement, but
>
>> class(1L:40000L)
> [1] "integer"
>> class(1:40000)
> [1] "integer"
>
> When using m:n there's no need for mL  or nL.
>
> Rui Barradas
>
> Em 17-03-2017 16:58, Jeff Newmiller escreveu:
>>
>> Reprex confirming Bert:
>>
>> A <- data.frame( y = 1L:40000L )
>> B <- data.frame( x = 1L:40000L )
>> A$x <- B$x
>> plot(B$x)
>>
>> #' ![](http://i.imgur.com/cXSFsBh.png)
>>
>> Care to demonstrate for us, Karl?
>>
>> https://cran.r-project.org/web/packages/reprex/README.html
>>
>> On Fri, 17 Mar 2017, Bert Gunter wrote:
>>
>>> You are wrong. No reordering occurs.
>>>
>>> Cheers,
>>> Bert
>>>
>>> Bert Gunter
>>>
>>> "The trouble with having an open mind is that people keep coming along
>>> and sticking things into it."
>>> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>>>
>>>
>>> On Fri, Mar 17, 2017 at 8:05 AM, Karl Schilling
>>> <karl.schilling at uni-bonn.de> wrote:
>>>>
>>>> Dear all:
>>>>
>>>> I have two data.frames A and B of the same number of rows (about
>>>> 40,000). I
>>>> realized that when I copy column x from data.frame A to B, the order
>>>> of this
>>>> column  gets changed. This seems to affect only values in rownumbers > ~
>>>> 35/36,000. It also happens in any of the following three approaches:
>>>>
>>>> A$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
>>>>
>>>> ______________________________________________
>>>> 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.
>>>
>>>
>>> ______________________________________________
>>> 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.
>>>
>>
>>
>> ---------------------------------------------------------------------------
>> Jeff Newmiller                        The     .....       .....  Go
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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.
>
>
> ______________________________________________
> 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.