[R] Fwd: Concatenation?

[Bert Gunter]

Inline comment below.
Cheers,
Bert

Bert Gunter

"....
or, if stored as columns of a matrix or data frame X, e.g.,

>
> ##############

> apply(X, 1, paste0)
>
##############
"
No. paste() is vectorized.  apply() can be avoided:
> df  <- data.frame(X1 = letters[1:3],
                 X2 = 5:7,
                 X3 = LETTERS[1:3]
)
> df
  X1 X2 X3
1  a  5  A
2  b  6  B
3  c  7  C

> do.call(paste0, df)
[1] "a5A" "b6B" "c7C"



  Hth  --  Gerrit
>
> ---------------------------------------------------------------------
> Dr. Gerrit Eichner                   Mathematical Institute, Room 212
> gerrit.eichner using math.uni-giessen.de   Justus-Liebig-University Giessen
> Tel: +49-(0)641-99-32104          Arndtstr. 2, 35392 Giessen, Germany
> Fax: +49-(0)641-99-32109            http://www.uni-giessen.de/eichner
> ---------------------------------------------------------------------
>
> Am 17.02.2021 um 22:09 schrieb Parkhurst, David:
> > If I have a vector of site abbreviations and a vector of depths in those
> water bodies, is there a simple way in R to combine them to make a third
> vector?
> > Examples:
> >
> > site  depth           desired
> > MU    0               MU0
> > MU    1               MU1
> > MU    2               MU2
> > MC    0               MC0
> > MC    1               MC1
> > MC    2               MC2
> >
> > The dataset has many more lines than this.  I can see how to do this
> with lots of if statements, but does R have magic that can make it happen
> easily?  I guess this would be called concatenation.
> >
> > ______________________________________________
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> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>
> ______________________________________________
> R-help using 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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