I have trouble making sense of the question, and I wonder if there is
a terminology issue.
For example, you have a list like this one:
mylist <- list( v1=1:3, v2=1:4, v3=1:5, v4=1:6)
(That is, a list of vectors of varying lengths.)
You want to apply a function to each pair of vectors:
First to v1 and v2,
Then to v2 and v3,
Then to v3 and v4
?
And also to pairs v1 and v3, v1 and v4, and so on?
Which one is larger, mylist$v1 or mylist$v2? Longer, yes, mylist$v2
is longer. But larger?
And ultimately you want to have the list with its elements in some other order,
perhaps v4 comes first, then v3, and so on?
-Don
At 1:21 PM -0500 2/6/10, David Neu wrote:
Hi,
I have a list of vectors (of varying lengths). I'd like to sort this
list by applying a function to each pair of vectors in the list and
returning information to sorting routine that let's it know which one
is larger.
To solve problems like this in Common Lisp, the sort function accepts
a function as an argument. The arguments to this function are two
elements of the list which is being sorted. The writer of the
function returns t (TRUE in R) when the first argument to the function
is larger than the second and nil (FALSE in R) otherwise.
I'm wondering if there is some way to accomplish this in R.
Many thanks for any help!
Cheers,
David
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--
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062
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