[R] How to split two levels several times?

[Rui Barradas]

Hello,

Sorry, I've just realized that your data frame is named 'XXX', not 
'dat'. Change that and the rest should work:


idx <- cumsum(c(TRUE, diff(XXX$electrode == "electrode1") > 0))
split(XXX, idx)


Rui Barradas

Em 22-07-2013 16:47, Rui Barradas escreveu:
> Hello,
>
> Try the following.
>
>
> idx <- cumsum(c(TRUE, diff(dat$electrode == "electrode1") > 0))
> split(dat, idx)
>
>
> Hope this helps,
>
> Rui Barradas
>
> Em 22-07-2013 15:09, dennis1991 at gmx.net escreveu:
>> Hi,
>>
>> I have a small problem with the function split() and would appreciate
>> your help.
>>
>> I have a table called “XXX” with 2 columns and 49 rows. The 49 rows
>> belong to 8 different levels (electrode1, ...,electrode8). I want to
>> split the table always at the row where “electrode1” starts again so
>> that I can export 7  individual dataframes (numbered “dataframe1” to
>> ”dataframe7”) which contain always electrode1 as first level (always
>> three rows) with the varying number of rows for electrodes2-8 below.
>> I tried the split function with various setups:
>>
>> t <- as.factor(XXX$electrode)
>>
>> dataframeX <- split(XXX, f=(levels=t))
>>
>> But this doesn’t work. Could you please help. Thank you! Dennis
>>
>>
>> This is the table "XXX"
>>
>> electrode    length
>>
>> electrode1    5.7
>> electrode1    6.3
>> electrode1    6.2
>> electrode2    11.4
>> electrode2    9.7
>> electrode1    5.7
>> electrode1    6.3
>> electrode1    6.2
>> electrode3    14.2
>> electrode3    14.8
>> electrode3    12.6
>> electrode1    5.7
>> electrode1    6.3
>> electrode1    6.2
>> electrode4    17.0
>> electrode4    16.3
>> electrode4    17.8
>> electrode4    18.3
>> electrode4    16.9
>> electrode4    18.5
>> electrode1    ....
>> ....        ....
>> electrode5    ....
>> ....        ....
>> electrode1    ....
>> electrode6    ....
>> electrode1    ....
>> electrode7    ....
>> electrode1    ....
>> electrode8    ....
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> 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
> 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.