All you need is
csum <- function(m) sapply(m, sum)
(in which case making csum a function does not achieve very much).
If for some reason you want to hang on to your code and just modify the last
line (though I cannot think why, but still...) you could do
csum <- function(m) {
a <- data.frame(m) ## not needed
s <- lapply(a,sum)
unlist(s) ## simplifies the list into a vector.
}
Bill Venables
http://www.cmis.csiro.au/bill.venables/
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of voidobscura
Sent: Tuesday, 28 July 2009 1:04 AM
To: r-help@r-project.org
Subject: [R] dataframe to list conversion
Hi all, I have been experimenting with writing my own matrix column sum
function. I want it to return a list.
csum<-function(m)
{
a = data.frame(m)
s = lapply(a,sum)
return(s)
}
I wish to use the same code up until the return(s) that I have listed above.
The problem is that s, I believe, is a data frame (looks like this:)
$X1
[1] 148
$X2
[1] 156
$X3
[1] 164
$X4
[1] 172
$X5
[1] 180
I would like a vector with these values (148,156,etc). How may I do this?
tia!
--
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and provide commented, minimal, self-contained, reproducible code.
