Originally posted by: Kyle_Wang

Hi 

   i have created 2 ICumulFunctionExpr Resource and Usage to represent the total available resource and actual usage. the actual usage has to less than total resource. But seems cp.le is working on 3 ICumulFunctionExpr.  Can some expert to suggest alternative way to do this? thanks!  

ICumulFunctionExpr resource = new ICumulFunctionExpr();
ICumulFunctionExpr usage = new ICumulFunctionExpr();
cp.Le(usage,resource)

Originally posted by: Petr Vilím

Hello,

this could be a bit awkward, but cumulative expressions cannot be compared using < or <= operator. Those operators work only with a constant on one of the sides.

However if you want to write something like expr1 <= expr2 then you can rewrite it as expr2-expr1 >= 0. Note that expr1-expr2 <= 0 is not a good idea because direclty constrained cumulative expression cannot be negative.

Best, Petr