On Wed, Dec 2, 2009 at 5:43 PM, Don <josereyno...@gmail.com> wrote:

> I am having difficulty approaching this problem.  I'm not sure if it
> can be done in one swoop, or requires a few steps.
>
> I have 5 vectors as such:
>
> a [2 4 6 7]
> b [1 3 9 2]
> c [2 4 5 6]
> d [6 1 3 8]
> e [4 8 2 1]
>
> And I want to take the minimum value at a given index between the
> vectors.  Therefore, minimum value at index 0 would yield the value 1
> from vector b.
>

(defn min-col [col vecs]
  (apply min (map #(nth % col) vecs)))

user=> (min-col 0 [[2 4 6 7] [1 3 9 2] [2 4 5 6] [6 1 3 8] [4 8 2 1]])
1

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