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Re: histogram question

> how can you turn the former into the latter without a loop?  This is
> somewhat similar to Pavel's running chunk index problem earlier in the
> year.  Finding an answer is not trivial.  It would apply directly to
> this problem, where the pairs are adjacent elements in the reverse
> indices vector.   Any takers?

I've encountered a few areas where certain logic problems cannot be
solved without a loop in IDL.  Usually, this always points to the fact
that there are certain IDL functions that (logically) insist upon
scalar parameters.

-Bill B.