Scattered indexing

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# From (scattered indexing)

If the left argument is a singleton, it is opened and its items are indexes along successive axes.

       (<0 2 ; 2 3) { m
     2  3
    10 11

What if the left argument wasn't a singleton?

       (0 2 ; 2 3) { m
    2 11

What is going on here? Nothing special, as this is just your old friend rank. The dyad `{` has a left rank of `0` and a right rank of `_` . This means that the left argument is taken as 0-cells and the right argument is taken in its entirety. Visually:

    (<0 2)  (first left cell)  { m   gives 2
    (<2 3)  (next left cell)   { m   gives 11

The result is assembled from the `2` and `11` partial results.

This is called scattered indexing.

       (0 0 ; 1 1 ; 2 2) { m	   NB. scatter index a diagonal
    0 5 10

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