[R] dataframe to list conversion

[voidobscura]

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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