jaxon@sp27.csrd.uiuc.edu (Greg P. Jaxon) (03/01/91)
> Brackets are anomalous in APL
Indeed their effects on the object to their left are basically left up
to that object. But I associated one semantic action with the OBJ to [
binding in APLB: The value of #IO to be used when interpreting the
content of the brackets was picked up at this point. The limit on RANK
was also applied here (if OBJ was data, ['s could have no more than RANK - 1
semicolons, if OBJ was not data, no semicolons, and value(s) in range for
axis numbers (remember laminate?))
The binding of #IO allows an axis specifier to become part of a derived
function and be used in a different #IO binding without changing the
axis being specified. One advantage of "rank" is that axes aren't numbered,
they are counted! Does J have a variable #IO, or have we finally been spared
that disaster?ljdickey@watmath.waterloo.edu (L.J.Dickey) (03/01/91)
In article <1991Feb28.200918.6276@csrd.uiuc.edu> jaxon@sp27.csrd.uiuc.edu (Greg P. Jaxon) writes: >... > > ... One advantage of "rank" is that axes aren't numbered, they are counted! >Does J have a variable #IO, or have we finally been spared that disaster? No disaster; the index origin is zero. -- Prof L.J. Dickey, Faculty of Mathematics, U of Waterloo, Canada N2L 3G1 Internet: ljdickey@watmath.waterloo.edu UUCP: ljdickey@watmath.UUCP ..!uunet!watmath!ljdickey X.400: ljdickey@watmath.UWaterloo.ca