Originally posted by: Nomykan

Hi Everyone,

  Is there any example of two stage stochastic optimization using CP optimizer. Any help will be appreciated. Thanks 

Hi

have you had a look at

CPLEX_Studio128\opl\examples\opl\sched_stochastic_jobshop

or

sched_stochastic_jobshop.cpp in CPLEX_Studio128\cpoptimizer\examples\src\cpp

?

regards

Originally posted by: Nomykan

Hi Alex, Thanks for your quick response. actually i have gone through the examples that you have listed in the forums like yield management, scheduled job shop, scheduled stochastic job shop and the examples that you posted in the forum. I am trying to solve a power system problem for minimizing the power generation cost using stochastic unit commitment but i am confused which one will be better to use OPL CPLEX or constraint programming  (CP Optimizer) for solving the problem. can you help me figure out which option will be better for getting optimal solution in minimal time with less complexity in model. Thanks again for such a quick response. 

Hi,

then you could also read

https://www.ibm.com/developerworks/community/forums/html/topic?id=83232365-b46b-44a9-8205-6570cf756cd6&ps=25

in

https://www.linkedin.com/pulse/model-building-oplcplex-alex-fleischer/

regards

https://www.linkedin.com/pulse/%E4%BC%98%E5%8C%96%E5%B0%91%E8%8A%B1%E9%92%B1%E5%A4%9A%E5%8A%9E%E4%BA%8B-%E5%8A%A8%E7%89%A9%E5%9B%AD%E5%85%AC%E5%85%B1%E6%B1%BD%E8%BD%A6%E5%92%8C%E5%84%BF%E7%AB%A5-alex-fleischer/

Originally posted by: Nomykan

Hi Alex, 

Thanks a lot .. i think this will make my work easy ... 

Originally posted by: Nomykan

Hi Alex, 

 i got the problem solved but now the problem is that i got too many warnings in the solution. i solved the problem for small network but if i do it for large network i think it will be too much time consuming. help regarding this issue is required. for simplicity i have a network consisting of nodes and lines. each line has a starting node and an ending node. like L1= from node 1 to 2 and so on. i declared in my model as 

range nodes=1..n;

float line[nodes][nodes]=...;

this works fines but as many of the configurations of the nodes are not used so i got too many warnings. i have attached the simple example here with this post. help in this regard will be appreciated. Thanks

Originally posted by: Petr Vilím

Hello,

I see this question marked as answered, but there is actually another question. Could you please specify what kind of warnings you get?

Thanks, Petr

Originally posted by: Nomykan

hi, 

actually these warnings have nothing with the solution but because there were too redundant variables which were not used by Cplex engine. so i was afraid if there is any way to make things more easy. using tuples instead of arrays is a better option. i have attached here with this the screenshot of the warnings that i get while using arrays. after using tuples it solved the problem.