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replace

Val-17
HI all,

if first name  is  Alex then I want concatenate the second column to Alex
to produce Alex and  the second column value

DF1 <- read.table(header=TRUE, text='first YR
Alex    2001
Bob     2001
Cory    2001
Cory    2002
Bob     2002
Bob     2003
Alex    2002
Alex    2003
Alex    2004')


Output
data frame
DF2
Alex-2001   2001
Bob             2001
Cory            2001
Cory            2002
Bob             2002
Bob             2003
Alex-2002   2002
Alex-2003   2003
Alex-2004   2004

I tried this one but did not work.
DF1$first[DF1$first=="Alex"] <-  paste(DF1$first, DF1$YR, sep='-')

Thank you in advance

        [[alternative HTML version deleted]]

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Re: replace

Marc Schwartz-3

> On Mar 13, 2017, at 5:53 PM, Val <[hidden email]> wrote:
>
> HI all,
>
> if first name  is  Alex then I want concatenate the second column to Alex
> to produce Alex and  the second column value
>
> DF1 <- read.table(header=TRUE, text='first YR
> Alex    2001
> Bob     2001
> Cory    2001
> Cory    2002
> Bob     2002
> Bob     2003
> Alex    2002
> Alex    2003
> Alex    2004')
>
>
> Output
> data frame
> DF2
> Alex-2001   2001
> Bob             2001
> Cory            2001
> Cory            2002
> Bob             2002
> Bob             2003
> Alex-2002   2002
> Alex-2003   2003
> Alex-2004   2004
>
> I tried this one but did not work.
> DF1$first[DF1$first=="Alex"] <-  paste(DF1$first, DF1$YR, sep='-')
>
> Thank you in advance


Hi,

See ?ifelse and try this:

DF1$Comb <- ifelse(DF1$first == "Alex",
                   paste(DF1$first, DF1$YR, sep = "-"),
                   as.character(DF1$first))

> DF1
  first   YR      Comb
1  Alex 2001 Alex-2001
2   Bob 2001       Bob
3  Cory 2001      Cory
4  Cory 2002      Cory
5   Bob 2002       Bob
6   Bob 2003       Bob
7  Alex 2002 Alex-2002
8  Alex 2003 Alex-2003
9  Alex 2004 Alex-2004


Note the coercion of the second returned value to character, otherwise you get the numeric code associated with the factor levels of DF1$first.

I generally try to avoid overwriting the source data, or in this case, column, to preserve it for future use as may be needed.

Regards,

Marc Schwartz

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Re: replace

PIKAL Petr
Hi

slightly different version without as.character

DF1$Comb <- ifelse(DF1$first=="Alex", paste(DF1$first, DF1$YR, sep="-"), paste(DF1$first, "", sep=""))
[1] "Alex-2001" "Bob"       "Cory"      "Cory"      "Bob"       "Bob"
[7] "Alex-2002" "Alex-2003" "Alex-2004"

Cheers
Petr


> -----Original Message-----
> From: R-help [mailto:[hidden email]] On Behalf Of Marc
> Schwartz
> Sent: Tuesday, March 14, 2017 12:33 AM
> To: Val <[hidden email]>
> Cc: R-help <[hidden email]>
> Subject: Re: [R] replace
>
>
> > On Mar 13, 2017, at 5:53 PM, Val <[hidden email]> wrote:
> >
> > HI all,
> >
> > if first name  is  Alex then I want concatenate the second column to
> > Alex to produce Alex and  the second column value
> >
> > DF1 <- read.table(header=TRUE, text='first YR
> > Alex    2001
> > Bob     2001
> > Cory    2001
> > Cory    2002
> > Bob     2002
> > Bob     2003
> > Alex    2002
> > Alex    2003
> > Alex    2004')
> >
> >
> > Output
> > data frame
> > DF2
> > Alex-2001   2001
> > Bob             2001
> > Cory            2001
> > Cory            2002
> > Bob             2002
> > Bob             2003
> > Alex-2002   2002
> > Alex-2003   2003
> > Alex-2004   2004
> >
> > I tried this one but did not work.
> > DF1$first[DF1$first=="Alex"] <-  paste(DF1$first, DF1$YR, sep='-')
> >
> > Thank you in advance
>
>
> Hi,
>
> See ?ifelse and try this:
>
> DF1$Comb <- ifelse(DF1$first == "Alex",
>                    paste(DF1$first, DF1$YR, sep = "-"),
>                    as.character(DF1$first))
>
> > DF1
>   first   YR      Comb
> 1  Alex 2001 Alex-2001
> 2   Bob 2001       Bob
> 3  Cory 2001      Cory
> 4  Cory 2002      Cory
> 5   Bob 2002       Bob
> 6   Bob 2003       Bob
> 7  Alex 2002 Alex-2002
> 8  Alex 2003 Alex-2003
> 9  Alex 2004 Alex-2004
>
>
> Note the coercion of the second returned value to character, otherwise you
> get the numeric code associated with the factor levels of DF1$first.
>
> I generally try to avoid overwriting the source data, or in this case, column, to
> preserve it for future use as may be needed.
>
> Regards,
>
> Marc Schwartz
>
> ______________________________________________
> [hidden email] 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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