[Rd] Subset has No Examples for Vector Data

Rui Barradas
Tue, 10 Oct 2023 11:17:19 -0000

?s 11:00 de 10/10/2023, Dario Strbenac via R-devel
escreveu:
> Hello,
>
> Could the documentation page for subset gain an example of how to use it
for something other than a data frame or matrix? I arrived at
>
>> random <- LETTERS[rpois(100, 10)]
>> subset(table(random), x > 10)
> named integer(0)
>
> I expected a part of the table to be returned rather than an empty vector.
>
> --------------------------------------
> Dario Strbenac
> University of Sydney
> Camperdown NSW 2050
> Australia
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
Hello,

If you want to subset then you must refer to a variable in the original
data set. In your example there is no 'x' in the output of table.


set.seed(2023)
random <- LETTERS[rpois(100, 10)]
(tbl <- table(random))
#> random
#>  C  D  E  F  G  H  I  J  K  L  M  N  P  Q  S
#>  1  2  4  4  8 13 14 10 17  9 11  2  1  3  1

subset(tbl, tbl > 10)
#> random
#>  H  I  K  M
#> 13 14 17 11


So it is subsetting vector data as wanted.
It is your expectation that a part of the table should be returned that
is not in agreement with the data you have.

Hope this helps,

Rui Barradas



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