I have been fairly routinely using Interval Index x I. y with
"almost ordered" lists x. These are lists of a few thousand
scalars where 98% of the steps are increasing and the
deceases are tiny. I only need an index near the value y
and have no need of a particular choice of index. I
get visual feedback on all the results and have never
felt the need to chose anything other than x I. y.

Am I a foolish old man?

Roger Hui wrote:
Interval Index is just finding the index of an item in
a sorted list.  Not really all that novel (binary search,
etc.) In 1987 I did not have it as a primitive and solved the problem with one application of the monad /: .

...

--
Clifford A. Reiter
Mathematics Department, Lafayette College
Easton, PA 18042 USA,   610-330-5277
http://www.lafayette.edu/~reiterc
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