[R] How to split two levels several times?

[dennis1991 at gmx.net]

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	....