I'm using Jess 4.1.
I get an error when trying to use the "-" operator with negative
numbers.
Is this a bug?
To work around this problem, I am trying to use the abs function to
convert the negative number to a positive.
What is wrong with this rule?
(defrule set_abs
(number ?num&:(< ?num 0))
=>
(assert (abs_num (abs ?num)))
)
Thanks
Christo
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