Originally posted by: DavidGravot

Hi

I can see in Java Api, endEval api is requiring a 

IloNumToNumSegmentFunction

public IloNumExpr endEval(IloIntervalVar a
, IloNumToNumSegmentFunction f
, double absVal) 
throws IloException

This function refers to piecewise linear function. 

I would like to query endEval on a stepwise function, which is semi-convex as well :  0 till time 0, cost 1 in [0,time1), cost2 in [time1,time2), cost3 in [time2,time3) and cost4 from time3

Is it allowed , and if yes, how shall I create this endEval expression from this stepwise function ?

Thanks

David

Hi,

you can describe any stepwise as a piecewise.

Let me give you an OPL example:

stepFunction f=stepwise {0->1; 2-> 2; 3-> 6;10};

pwlFunction f2=piecewise {0->1;2->1;0->2;1->2;0->6;7->6;0};

 

assert f(0)==f2(0);
assert f(1)==f2(1);
assert f(2)==f2(2);
assert f(6)==f2(6);

regardds

Originally posted by: Paul Shaw

Hi,

For the Java API, you can look at the delivered example SchedTime.java, which uses IloCP.endEval with an IloNumToNumSegmentFunction created through a call to IloCP.piecewiseLinearFunction.  The documentation for the latter function explains how to repeat an x-value in the specification of the piecewise linear function to create a discontinuity.

Regards,

Paul

Originally posted by: DavidGravot

Thanks Alex and Paul.