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G.Maubach at gmx.de

2016-Apr-22 15:52 UTC

[R] Creating variables on the fly

Hi all,

I would like to use a loop for tasks that occurs repeatedly:

# Groups 
# Umsatz <= 0: 1 (NICHT kaufend) 
# Umsatz > 0: 2  (kaufend) 
for (year in c("2011", "2012", "2013",
"2014", "2015")) {
  paste0("Kunden$Kunde_real_", year) <-
(paste0("Kunden$Umsatz_", year) <= 0) * 1 +
                                        (paste0("Kunden$Umsatz_",
year) >  0) * 2
  paste0("Kunden$Kunde_real_", year) <-
factor(paste0("Kunden$Umsatz_", year),
                                               levels = c(1, 2), 
                                               labels = c("NICHT
kaufend", "kaufend"))
  } 

This actually does not work due to the fact that the expression
"paste0("Kunden$Kunde_real_", year)" ist not interpreted as
a variable name by the R script language interpreter.

Is there a way to assembly variable names on the fly in R?

Regards

Georg

Sarah Goslee

2016-Apr-23 06:10 UTC

head link

[R] Creating variables on the fly

The direct answer to your question is to look at ?get and ? assign.

The R-ish answer to your question is to store the data as elements of a
list rather than separate files and use lapply() instead.

Sarah

On Friday, April 22, 2016, <G.Maubach at gmx.de> wrote:
> Hi all,
>
> I would like to use a loop for tasks that occurs repeatedly:
>
> # Groups
> # Umsatz <= 0: 1 (NICHT kaufend)
> # Umsatz > 0: 2  (kaufend)
> for (year in c("2011", "2012", "2013",
"2014", "2015")) {
>   paste0("Kunden$Kunde_real_", year) <-
(paste0("Kunden$Umsatz_", year) <> 0) * 1 +
>                                         (paste0("Kunden$Umsatz_",
year) >
> 0) * 2
>   paste0("Kunden$Kunde_real_", year) <-
factor(paste0("Kunden$Umsatz_",
> year),
>                                                levels = c(1, 2),
>                                                labels = c("NICHT
kaufend",
> "kaufend"))
>   }
>
> This actually does not work due to the fact that the expression
> "paste0("Kunden$Kunde_real_", year)" ist not
interpreted as a variable name
> by the R script language interpreter.
>
> Is there a way to assembly variable names on the fly in R?
>
> Regards
>
> Georg
>
> ______________________________________________
> R-help at r-project.org <javascript:;> 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.
>

-- 
Sarah Goslee
http://www.stringpage.com
http://www.sarahgoslee.com
http://www.functionaldiversity.org

	[[alternative HTML version deleted]]

Ulrik Stervbo

2016-Apr-23 06:19 UTC

head link

[R] Creating variables on the fly

Hi Georg,

The " around Kunden$* looks unintentional to me.

Second: haveyou considered using a long table? Then you would fill a known
set of columns.

Third if you must have columns based on year I believe df[[a.column.name]]
will work.

Best


Ulrik

<G.Maubach at gmx.de> schrieb am Sa., 23. Apr. 2016 07:33:
> Hi all,
>
> I would like to use a loop for tasks that occurs repeatedly:
>
> # Groups
> # Umsatz <= 0: 1 (NICHT kaufend)
> # Umsatz > 0: 2  (kaufend)
> for (year in c("2011", "2012", "2013",
"2014", "2015")) {
>   paste0("Kunden$Kunde_real_", year) <-
(paste0("Kunden$Umsatz_", year) <> 0) * 1 +
>                                         (paste0("Kunden$Umsatz_",
year) >
> 0) * 2
>   paste0("Kunden$Kunde_real_", year) <-
factor(paste0("Kunden$Umsatz_",
> year),
>                                                levels = c(1, 2),
>                                                labels = c("NICHT
kaufend",
> "kaufend"))
>   }
>
> This actually does not work due to the fact that the expression
> "paste0("Kunden$Kunde_real_", year)" ist not
interpreted as a variable name
> by the R script language interpreter.
>
> Is there a way to assembly variable names on the fly in R?
>
> Regards
>
> Georg
>
> ______________________________________________
> 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.
>
	[[alternative HTML version deleted]]

MacQueen, Don

2016-Apr-25 17:35 UTC

head link

[R] Creating variables on the fly

I'm going to assume that Kunden is a data frame, and it has columns
(variables) with names like
  Umstatz_2011
and that you want to create new columns with names like
  Kunde_real_2011

If that is so, then try this (not tested):

for (year in 2011:2015) {
  nmK <- paste0("Kunde_real_", year)
  nmU <- paste0("Umsatz_", year)
  cat('Creating',nmK,'from',nmU,'\n')
  Kunden[[ nmK ]] <- ifelse( Kunden[[ nmU ]] <= 0, 1, 2)
  Kunden[[ nmK ]] <- factor( Kunden[[ nmK ]],
       levels=c(1,2),
       labels= c("NICHT kaufend", "kaufend")
       )

}

This little example should illustrate the method:

> foo <- data.frame(a=1:4)
> foo  a
1 1
2 2
3 3
4 4> foo[['b']] <- foo[['a']]*3
> foo  a  b
1 1  3
2 2  6
3 3  9
4 4 12



-- 
Don MacQueen

Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062





On 4/22/16, 8:52 AM, "R-help on behalf of G.Maubach at gmx.de"
<r-help-bounces at r-project.org on behalf of G.Maubach at gmx.de> wrote:
>Hi all,
>
>I would like to use a loop for tasks that occurs repeatedly:
>
># Groups 
># Umsatz <= 0: 1 (NICHT kaufend)
># Umsatz > 0: 2  (kaufend)
>for (year in c("2011", "2012", "2013",
"2014", "2015")) {
>  paste0("Kunden$Kunde_real_", year) <-
(paste0("Kunden$Umsatz_", year)
><= 0) * 1 + 
>                                        (paste0("Kunden$Umsatz_",
year) >
> 0) * 2 
>  paste0("Kunden$Kunde_real_", year) <-
factor(paste0("Kunden$Umsatz_",
>year), 
>                                               levels = c(1, 2),
>                                               labels = c("NICHT
>kaufend", "kaufend"))
>  } 
>
>This actually does not work due to the fact that the expression
>"paste0("Kunden$Kunde_real_", year)" ist not interpreted
as a variable
>name by the R script language interpreter.
>
>Is there a way to assembly variable names on the fly in R?
>
>Regards
>
>Georg
>
>______________________________________________
>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.

G.Maubach at weinwolf.de

2016-Apr-26 06:44 UTC

head link

[R] Antwort: Fw: Re: Creating variables on the fly (SOLVED)

Hi Don,
Hi to all readers,

many thanks for all your answers and all your help.

I adapted Don's code to my data and Don's code does the trick:

str(Kunden01)

for (year in 2011:2015) {
  Reeller_Kunde <- paste0("Reeller_Kunde_", year)
  Umsatz <- paste0("Umsatz_", year)
  cat('Creating', Reeller_Kunde,'from', Umsatz,'\n')
  Kunden01[[ Reeller_Kunde ]] <- ifelse( Kunden01[[ Umsatz ]] >= 0, 1, 2)
  Kunden01[[ Reeller_Kunde ]] <- factor( Kunden01[[ Reeller_Kunde ]],
                                         levels=c(1,2),
                                         labels= c("NICHT kaufend", 
"kaufend")
  )
}

str(Kunden01)

This way a new variable is created by building it from a string 
concatenation.

I also like the cat() function to document the process within the loop 
while running the program.

Many thanks for your help.

Kind regards

Georg




Von:    G.Maubach at gmx.de
An:     g.maubach at weinwolf.de, 
Datum:  25.04.2016 21:37
Betreff:        Fw: Re: [R] Creating variables on the fly




> Gesendet: Montag, 25. April 2016 um 19:35 Uhr
> Von: "MacQueen, Don" <macqueen1 at llnl.gov>
> An: "G.Maubach at gmx.de" <G.Maubach at gmx.de>,
"r-help at r-project.org"
<r-help at r-project.org>> Betreff: Re: [R] Creating variables on the fly
>
> I'm going to assume that Kunden is a data frame, and it has columns
> (variables) with names like
>   Umstatz_2011
> and that you want to create new columns with names like
>   Kunde_real_2011
> 
> If that is so, then try this (not tested):
> 
> for (year in 2011:2015) {
>   nmK <- paste0("Kunde_real_", year)
>   nmU <- paste0("Umsatz_", year)
>   cat('Creating',nmK,'from',nmU,'\n')
>   Kunden[[ nmK ]] <- ifelse( Kunden[[ nmU ]] <= 0, 1, 2)
>   Kunden[[ nmK ]] <- factor( Kunden[[ nmK ]],
>        levels=c(1,2),
>        labels= c("NICHT kaufend", "kaufend")
>        )
> 
> }
> 
> This little example should illustrate the method:
> 
> 
> > foo <- data.frame(a=1:4)
> > foo
>   a
> 1 1
> 2 2
> 3 3
> 4 4
> > foo[['b']] <- foo[['a']]*3
> > foo
>   a  b
> 1 1  3
> 2 2  6
> 3 3  9
> 4 4 12
> 
> 
> 
> -- 
> Don MacQueen
> 
> Lawrence Livermore National Laboratory
> 7000 East Ave., L-627
> Livermore, CA 94550
> 925-423-1062
> 
> 
> 
> 
> 
> On 4/22/16, 8:52 AM, "R-help on behalf of G.Maubach at gmx.de"
> <r-help-bounces at r-project.org on behalf of G.Maubach at gmx.de>
wrote:
> 
> >Hi all,
> >
> >I would like to use a loop for tasks that occurs repeatedly:
> >
> ># Groups 
> ># Umsatz <= 0: 1 (NICHT kaufend)
> ># Umsatz > 0: 2  (kaufend)
> >for (year in c("2011", "2012", "2013",
"2014", "2015")) {
> >  paste0("Kunden$Kunde_real_", year) <-
(paste0("Kunden$Umsatz_", year)
> ><= 0) * 1 + 
> >                                       
(paste0("Kunden$Umsatz_", year)
>
> > 0) * 2 
> >  paste0("Kunden$Kunde_real_", year) <-
factor(paste0("Kunden$Umsatz_",
> >year), 
> >                                               levels = c(1, 2),
> >                                               labels = c("NICHT
> >kaufend", "kaufend"))
> >  } 
> >
> >This actually does not work due to the fact that the expression
> >"paste0("Kunden$Kunde_real_", year)" ist not
interpreted as a variable
> >name by the R script language interpreter.
> >
> >Is there a way to assembly variable names on the fly in R?
> >
> >Regards
> >
> >Georg
> >
> >______________________________________________
> >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.
> 
>

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