Original Message-
From: Kara Przeczek [mailto:przec...@unbc.ca]
Sent: Tuesday, February 09, 2010 7:07 PM
To: r-help@r-project.org
Subject: [R] sum sections of data of different lengths from within a data
frame
Dear R Help:
I am trying to sum data from one column in a dataframe based on a
WIll this do it for you:
> x <- read.table(textConnection("ColA ColB
+ 10
+ 30
+ 21
+ 20
+ 10
+ 40
+ 11
+ 91
+ 30
+ 50
+ 21"), header=TRUE)
> closeAllConnections()
> x.s <- split(x, cumsum(x$ColB))
> x.l <- do
Dear R Help:
I am trying to sum data from one column in a dataframe based on a value in
another. I do not know how to do this easily in R.
For example:
Col A Col B
10
30
21
20
10
40
11
91
30
50
21
I would l
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