[R] How to split two levels several times?

[arun]

May be this helps:


 split(XXX,cumsum(c(TRUE,diff(as.numeric(XXX$electrode))<0)))
A.K.



----- Original Message -----
From: "dennis1991 at gmx.net" <dennis1991 at gmx.net>
To: r-help at r-project.org
Cc: 
Sent: Monday, July 22, 2013 10:09 AM
Subject: [R] How to split two levels several times?

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    ....

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