It just means what it sounds like: some code in this example called a function named "Acos", but there's no function by that name to call. Jess doesn't have one built in, and the example apparently doesn't define one, either.

On Nov 18, 2007, at 3:41 PM, molistok wrote:


Hi, I am trying to run one example of jess and I see this error:
while executing (Acos ?valor)
...
...
 unimplemented function Acos.
Can anybody help me please?
Thanks.
--
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