Hi,
Jim's answer is neat. There is an issue on the result. All are
characters even though some are numeric or logic. The following
implementation retains the variable type.
> x
[[1]]
[1] 2 3 5
[[2]]
[1] "aa" "bb" "cc"
[[3]]
[1] TRUE FALSE TRUE
> getFirst
function(aList)
{
result <- list()
for (i in 1:length(aList))
{
result <- c(result, aList[[i]][1])
}
return(result)
}
> getFirst(x)
[[1]]
[1] 2
[[2]]
[1] "aa"
[[3]]
[1] TRUE
>
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