There are several ways to do it, but one example using list comprehension:
(let [nums [1 2 3]]
(for [n1 nums]
(for [n2 nums]
(* n1 n2))))
=> ((1 2 3) ( 2 4 6) (3 6 9))
- Mark
On Tue, Jul 20, 2010 at 10:44 AM, Michael Harrison (goodmike) <
[email protected]> wrote:
> I'm working on a project that involves calculating statistical
> distance between the elements of a set. This is conceptually like a
> distance chart between cities that often appears on a travel map, or
> even a child's multiplication table with the numbers 1 - 10 running
> across the top and down the left of the table and the products of the
> numbers in the middle.
>
> All the sample code I've seen for doing something like this is
> imperative: an outer loop running over the whole set of items, and an
> inner loop running over the items between the outer loop's item and
> the end of the set. The calculated distance between the outer loop's
> current item and the inner loop's current item gets stuck in a 2-D
> array.
>
> I know it's possible to do something like this by going down to java
> interop, but I feel there must be a more appropriately Clojure way to
> handle this. I'm not sure how to find it, though. It seems like a math
> or statistics problem that must be common enough that there is a right
> way to tackle it. Do any of you laziness and FP wizards have
> suggestions?
>
> Thanks!
> Michael
>
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