Concatenation? - R-help | R Mailing Lists

Thu, Feb 18, 2021 12:50 AM #

[I forgot to keep it on the list.]

-------- Weitergeleitete Nachricht --------
Betreff: Re: [R] Concatenation?
Datum: Wed, 17 Feb 2021 22:14:13 +0100
Von: Gerrit Eichner <gerrit.eichner at math.uni-giessen.de>
Organisation: JLU Gie?en
An: Parkhurst, David <parkhurs at indiana.edu>

Hi David,

checkout, e. g., base-R's

paste0(site, depth)

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

apply(X, 1, paste0)

or, e.g., tidyr's

unite.

  Hth  --  Gerrit

---------------------------------------------------------------------
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Am 17.02.2021 um 22:09 schrieb Parkhurst, David:

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Bert Gunter

Thu, Feb 18, 2021 8:08 AM #

Inline comment below.
Cheers,
Bert

Bert Gunter

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

##############
"
No. paste() is vectorized.  apply() can be avoided:

X2 = 5:7,
                 X3 = LETTERS[1:3]
)

X1 X2 X3
1  a  5  A
2  b  6  B
3  c  7  C

[1] "a5A" "b6B" "c7C"



  Hth  --  Gerrit

______________________________________________
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.

Gerrit Eichner

Thu, Feb 18, 2021 9:01 AM #

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.eichner at math.uni-giessen.de   Justus-Liebig-University Giessen
Tel: +49-(0)641-99-32104          Arndtstr. 2, 35392 Giessen, Germany
http://www.uni-giessen.de/eichner
---------------------------------------------------------------------

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.eichner at math.uni-giessen.de
    <mailto:gerrit.eichner at 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.

     >
     > ______________________________________________
     > R-help at r-project.org <mailto:R-help at r-project.org> mailing list

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     > https://stat.ethz.ch/mailman/listinfo/r-help

    <https://stat.ethz.ch/mailman/listinfo/r-help>

     > PLEASE do read the posting guide

    http://www.R-project.org/posting-guide.html
    <http://www.R-project.org/posting-guide.html>
     > and provide commented, minimal, self-contained, reproducible code.
     >

    ______________________________________________
    R-help at r-project.org <mailto:R-help at r-project.org> mailing list --
    To UNSUBSCRIBE and more, see
    https://stat.ethz.ch/mailman/listinfo/r-help
    <https://stat.ethz.ch/mailman/listinfo/r-help>
    PLEASE do read the posting guide
    http://www.R-project.org/posting-guide.html
    <http://www.R-project.org/posting-guide.html>
    and provide commented, minimal, self-contained, reproducible code.