The easiest way is to just do something like this:
> mdat <- matrix(c(4,2,3, 11,12,13), nrow = 2, ncol=3)
> mdat
[,1] [,2] [,3]
[1,] 4 3 12
[2,] 2 11 13
> as.vector ( colSums ( mdat ) )
[1] 6 14 25
>
HTH
--
David
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
On Behalf Of voidobscura
Sent: Thursday, July 16, 2009 2:26 PM
To: r-help@r-project.org
Subject: [R] DataFrame help
Alright, so I am trying to write my own function to calculate column
sums in
a matrix. I want the result as a single list with the values.
So far I have:
csum<-function(m)
{
a = data.frame(m)
s = lapply(a,sum)
return(s)
}
What is the easiest way to have it return in a format such as [1] 6 15
24 ?
Thanks.
--
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