Boolean And - one question

Hi Valery,

Mathcad doesn't appear to implement lazy evaluation(*), except in specific instances (such as the boolean operators). Your function And is a standard function, so Mathcad evaluates both arguments of your function And before calling it.

I suspect that the 3<i comparison might be picked up as a static type incompatibility, ie it's done at compile time rather that during execution, which is why Mathcad doesn't seem to follow the boolean non-evaluation rule.

However, I do agree that it would be good to implement lazy evaluation and some form of memoization..

Stuart

Note:

(*) Lazy Evaluation (Russian)

Lazy Evaluation (English)