15
ZPL Detail (continued)
•The
unary global operation reduction (<<)
“reduces”
an entire array to a single value using an associative operator: +<<, *<<, max<<, min<<, &<<, |<<
•For
example, +<< is
summation (S) and max<< is global maximum
err := max<< abs(Temp
- A);
Global sum was solved the first day
with a tree algorithm;
global maximum was solved with the tournament algorithm … primitive in ZPL