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Stefano Sabatini 999495734b lavu/eval: add if() and ifnot() eval functions
They allow to implement the if/then/else logic, which cannot be
implemented otherwise.

For example the expression:
A*B + not(A)*C

always evaluates to NaN if B is NaN, even in the case where A is 0.
2012-01-17 12:03:30 +01:00
..
2011-08-01 11:36:16 +02:00
2011-04-29 18:08:46 +02:00