[rules-users] rule algorithm

[thomas kukofka]

Hello,

I search a rule implementation for the following calculation:
I have n Objects of differents types (A, B, C, ...) each with a parameter
certainty.

the overall certainty is calculated as follows: certaintyOverall =
(certaintyA * weightA + certaintyB * weightB + ... ) / (weightA  + weightB +
...)

If it can be assumed that all Objects in the formula always exist it's quite
easy:
when
  A (certaintyA: certainty)
  B (certaintyB: certainty)
  ...
then
  certaintyOverall = (certaintyA * weightA + certaintyB * weightB + ... ) /
(weightA  + weightB + ...)

But if one ore more objects are missing the formula should be reduced to the
certainty and weights of the existing objects. But there are too many
combinations of existing/nonexisting objects. How can this be implemented in
Drools?

Regards
Thomas
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