GAMS World Forum

hello According to the model, you can use from a table (or parameter) to define model data. For example, you may have a process time parameter (time of operation of jobs) or a route parameter (binary parameter: 1 if the operation of j pressed before operation of i in machine k, otherwise 0) that dep...

Hello everybody I have a question about coding logical constraint in the GAMS IDE. Please, let me describe optimization model: { set i /1*2/; parameter cost(i); integer variable nb(i); .... of.. obj =e= sum(i,cost(i)*nb(i))+(x-1)*500; con1.. sum(i,nb(i)*ns(i)) =g= N; } There is a logical constraint ...

Dear Fred

Thanks for your replay.
Please let me describe my problem. I want to solve my model with three deferent solvers using for loop. I coded it with for statement but I want to know, do exist the better way to code it?

Best regards

Hello
Thanks for your reply.
My means that, have a specific syntax for write easy or better this subject?
(For example I know that, optfile syntax can replace with option=solver.name)

Best regards

Hello I try to solve a model with deferent solver simultaneously. for example, with cplex, xpress, lindo. My code is: Scalar iter; Parameter solution; for(iter=1 to 1, ****************************************************** OPTION MIP=cplex; SOLVE FCTP USING MIP MIN obj; if (FCTP.modelstat<>%modelsta...

Dear Michael
Thanks for your replay.

Pls, let me know, how can I define multidimensional sets & alias them in the Java API?

Best regards

Hello all I trying to write an optimization model in Java API directly. I read gams java API tutorial. I can define sets, parameters & variables in java but I don't define optimization model in java. pls, let me know, can I write my model in java directly or gams java API don't support this func...

hello i have a flexible job shop model with below form: i index of machines /1*2/ j index of jobs /1*3/ k index of operations /1*5/ p index of positions /1*7/ l(j,k) /1.(1*5), 2.(1*3)/ * that is, operation k for job j f(i,p) /1.(1*5), 2.(1*3)/ * that is, position p in machine i model have 3 dimensio...

hello
can write an optimization model in java (sets, data, model) without write gams ide language in java editor, and solve it with gams? (such as cplex or gurobi api that dont need to write opl/gurobi ide languages)

best regards