[R] How do I access a specific element of a multi-dimensional list

[JS Huang]

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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