Hi,
I have changed the rank operator with axis, i.e. ?[X].
The old implementation tried to improve on the somewhat broken
syntax specified in the ISO standard:
* A ?[y] B ?? A ? y B*
* ?[y] B ?? ? y B*
The new implementation follows NARS which uses *?[X] *instead of *?*
when conforming the final result.
Note that the "flat" format like *A ? y B *can give surprising results, so
you should always put the operator arguments in parentheses like *(A ? y) B
*for clarity.
The current implementation (axis or not) binds *y* to *B* and not to *?*, so
*A ? y B* means *A ? (y B)*and not **(A ? y) B**. The "correct" binding
of APL2
would read a simple thing as *A ? 1 2 3 B *as *(A ? 1)(2 3 B) *which
might surprise
less-frequent users of *?*.
It is unknown how APL2 itself would handle this because they haven't
implemented ?
(or any other primitive operator with a value instead of a function as
the right function
argument).
/// Jürgen
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