[R] cut variable within a loop

[Janka Vanschoenwinkel]

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_Irrigation=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))
>>
>>
>> --
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>>
>
>


-- 

[image: Logo UHasselt]Mevrouw Janka Vanschoenwinkel
*Doctoraatsbursaal - PhD *
Milieueconomie - Environmental economics

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