Right, Bert, but not if X is "only" matrix. ;-)
> X <- cbind(X1 = letters[1:3],
X2 = 5:7,
X3 = LETTERS[1:3]
)
> do.call(paste0, X)
Fehler in do.call(paste0, X) : das zweite Argument muss eine Liste sein
(Sorry, but my system is German. :-))
But, of course, then, e.g.,
do.call(paste0, data.frame(X))
would work.
Best -- Gerrit
---------------------------------------------------------------------
Dr. Gerrit Eichner Mathematical Institute, Room 212
gerrit.eich...@math.uni-giessen.de Justus-Liebig-University Giessen
Tel: +49-(0)641-99-32104 Arndtstr. 2, 35392 Giessen, Germany
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---------------------------------------------------------------------
Am 18.02.2021 um 17:08 schrieb 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.eich...@math.uni-giessen.de
<mailto:gerrit.eich...@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
<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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