At 2005-06-08 10:03 -0400, Jaime Stuardo wrote:
If I want to test that all nodes has value different from 0, I have to
use x!=0 or not(x=0) ?
Use not(x=0) to return true if all of the values are not equal to 0. The
processor will walk through each node in set "x" and continue checking as
long as the answer is false. "x=0" is false if x is non-zero, so it keeps
checking the nodes in x. As soon as any is true, the comparison stops and
true is returned, and the not() changes the true to false. If all of the
tests are false, then false is returned and not() changes the false to
true, implying that all of the nodes are not equal to zero because none of
the nodes are equal to zero.
But be aware of what you want for the empty set "x", though. Do you want
true or false? The comparison is initialized to false so if there are no
nodes in "x" the comparison returns false and the not() returns true and
you will get "all nodes different from 0" when you have no nodes ... you
may not want that.
I hope this helps.
. . . . . . Ken
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