Search found 39 matches
- 5 years ago
- Forum: Modeling
- Topic: flexible job shop scheduling
- Replies: 1
- Views: 2714
Re: flexible job shop scheduling
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...
- 5 years ago
- Forum: Modeling
- Topic: Logical constraint
- Replies: 0
- Views: 2175
Logical constraint
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 ...
- 5 years ago
- Forum: Modeling
- Topic: solving a model with deferent solvers
- Replies: 5
- Views: 5354
Re: solving a model with deferent solvers
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
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
- 5 years ago
- Forum: Modeling
- Topic: solving a model with deferent solvers
- Replies: 5
- Views: 5354
Re: solving a model with deferent solvers
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
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
- 5 years ago
- Forum: Modeling
- Topic: solving a model with deferent solvers
- Replies: 5
- Views: 5354
solving a model with deferent solvers
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...
- 6 years ago
- Forum: API
- Topic: write an optimization model in java
- Replies: 1
- Views: 5355
Re: write an optimization model in java
Dear Michael
Thanks for your replay.
Pls, let me know, how can I define multidimensional sets & alias them in the Java API?
Best regards
Thanks for your replay.
Pls, let me know, how can I define multidimensional sets & alias them in the Java API?
Best regards
- 6 years ago
- Forum: API
- Topic: write an optimization model in java
- Replies: 1
- Views: 5355
write an optimization model in java
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...
- 6 years ago
- Forum: Modeling
- Topic: special sets and parameters
- Replies: 1
- Views: 2439
special sets and parameters
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...
- 6 years ago
- Forum: API
- Topic: Combining GAMS & Java
- Replies: 0
- Views: 3287
Combining GAMS & Java
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
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