[R] cut variable within a loop

Fri Aug 14 12:01:33 CEST 2015

Hi

Didn't you by chance use plain cut and k2 was NA?

> cut(1:300, NA)
Error in cut.default(1:300, NA) : invalid number of intervals

Cheers
Petr

> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Janka
> Vanschoenwinkel
> Sent: Friday, August 14, 2015 10:16 AM
> To: Michael Dewey
> Cc: r-help at r-project.org
> Subject: Re: [R] cut variable within a loop
>
> Hey Michael,
>
> Sorry for the late reply!
>
> Thanks for your comment, but for the cut2 command, this is not the
> case. If I enter for instance
>
> Alldata$irri=cut2(irrigation,3)
>
> Then I get 2 intervals from 0-3 and from 3-100.
>
> Janka
>
> 2015-08-11 17:25 GMT+02:00 Michael Dewey <lists at dewey.myzen.co.uk>:
>
> > Dear Janka
> > If you supply a single number to the breaks parameter of cut I think
> > it is the number of intervals.
> >
> >
> > On 11/08/2015 13:57, Janka Vanschoenwinkel wrote:
> >
> >> Hi Thierry!
> >>
> >> Thanks for your answer. I tried this, but I get this error:
> >>
> >> "Error in cut.default(x, k2) : invalid number of intervals"
> >>
> >> Which is strange because I am not specifying intervals, but the
> >> number at where the sample has to be cut?
> >>
> >> Greetings from Belgium! :-)
> >>
> >> 2015-08-11 14:52 GMT+02:00 Thierry Onkelinx
> <thierry.onkelinx at inbo.be>:
> >>
> >> Dear Janka,
> >>>
> >>> You loop goes for 0 to 100. It should probably go from 1:99
> >>>
> >>> Best regards,
> >>>
> >>> ir. Thierry Onkelinx
> >>> Instituut voor natuur- en bosonderzoek / Research Institute for
> >>> Nature and Forest team Biometrie & Kwaliteitszorg / team Biometrics
> >>> & Quality Assurance Kliniekstraat 25 1070 Anderlecht Belgium
> >>>
> >>> To call in the statistician after the experiment is done may be no
> >>> more than asking him to perform a post-mortem examination: he may
> be
> >>> able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher
> >>> The plural of anecdote is not data. ~ Roger Brinner The combination
> >>> of some data and an aching desire for an answer does not ensure
> that
> >>> a reasonable answer can be extracted from a given body of data.
> >>> ~ John Tukey
> >>>
> >>> 2015-08-11 14:38 GMT+02:00 Janka Vanschoenwinkel <
> >>> janka.vanschoenwinkel at uhasselt.be>:
> >>>
> >>> Dear list members,
> >>>>
> >>>> I have a loop where I want to do several calculations for
> different
> >>>> samples and save the results for each sample. These samples are
> for
> >>>> each loop different. I want to use the "i" in the loop to cut the
> >>>> samples.
> >>>>
> >>>> So for instance:
> >>>>
> >>>>     - In loop 1 (i=1), I have a sample from 0-1 and a sample from
> 1-100.
> >>>>     - In loop 2 (i=2), I have a sample from 0-2 and a sample from
> 2-100.
> >>>>     - In loop 99 (i=99), I have a sample from 0-99 and a sample
> >>>> from 99-100.
> >>>>
> >>>> I built the following function, but there is *a problem with the
> >>>> cut2
> >>>> function* since it doesn't recognize the "i". Outside the lapply
> >>>> loop it works, but not inside the loop.
> >>>>
> >>>> Could somebody please help me with this problem? Thanks a lot!
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> d=data.frame(MEt_Rainfed=rep(0,100),MEp_Rainfed=rep(0,100),MEt_Irri
> >>>> gation=rep(0,100),MEp_Irrigation=rep(0,100))
> >>>>
> >>>>
> >>>>
> >>>>      o<-lapply(0:100, function(i){
> >>>>
> >>>>
> >>>>
> >>>>          Alldata$irri=cut2(Alldata$irrigation,i)
> >>>>
> >>>>          levels(Alldata$irri)<-c("0","1")
> >>>>
> >>>>
> >>>>
> >>>>         Alldata_Rainfed<-subset(Alldata, irri == 0)
> >>>>
> >>>>         Alldata_Irrigation<-subset(Alldata, irri == 1)
> >>>>
> >>>>
> >>>>
> >>>>      #calculations per sample, then store all the values per i and
> >>>> per variable in a dataframe: (the calculations are not shown in
> >>>> this
> >>>> example)
> >>>>
> >>>>
> >>>>
> >>>>       d[i, ] =
> >>>> c(MEt_Rainfed,MEp_Rainfed,MEt_Irrigation,MEp_Irrigation)
> >>>>
> >>>>
> >>>>
> >>>>     })
> >>>>
> >>>>
> >>>>
> >>>>     out<-as.data.frame(do.call(rbind, o))
> >>>>
> >>>>
> >>>> --
> >>>> P Please consider the environment before printing this e-mail
> >>>>
> >>>>          [[alternative HTML version deleted]]
> >>>>
> >>>> ______________________________________________
> >>>> 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.
> >>>>
> >>>>
> >>>
> >>>
> >>
> >>
> > --
> > Michael
> > http://www.dewey.myzen.co.uk/home.html
> >
>
>
>
> --
>
> [image: Logo UHasselt]Mevrouw Janka Vanschoenwinkel *Doctoraatsbursaal
> - PhD * Milieueconomie - Environmental economics
>
> T +32(0)11 26 87 42 | GSM +32(0)476 28 21 40
>
> www.uhasselt.be/eec
>
> Universiteit Hasselt | Campus Diepenbeek Agoralaan Gebouw D | B-3590
> Diepenbeek Kantoor F11
>
> Postadres: Universiteit Hasselt | Martelarenlaan 42 | B-3500 Hasselt
>
> P Please consider the environment before printing this e-mail
>
>       [[alternative HTML version deleted]]
>
> ______________________________________________
> 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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