AMPL Modeling Language

This is a discussion and help group for AMPL, an algebraic modeling language for optimization problems of many kinds.  AMPL lets people use common notation and familiar concepts to formulate models and examine solutions, while the computer manages communication with appropriate solvers.

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Showing 1-20 of 4225 topics
Obtaining gradient and hessian after optimization Gaston Illanes 10:52 AM
invalid subscript Milan Marinkovic 10:49 AM
AMPL vs AMPL studio 10:46 AM
generating scenario tree from 10:22 AM
Can't find file Mackenzie Via 9:40 AM
Problem with a constraint modelling Miroslav Prokic 7:37 AM
If in constraints (AMPL-CPLEX) Wafa Lakdhar 4:08 AM
termination code 11 hessam 8/26/16
AMPL/CPLEX crash with MISOCP Benoît Martin 8/26/16
RE: [AMPL 12396] AMPL/CPLEX crash with MISOCP Robert Fourer 8/26/16
Computed parameter 8/26/16
variable with changing number of arguments mar_ir 8/26/16
Negative variables in the linear relaxation 8/26/16
URGENT!!! presolve, constraint six_one['c1',1]: all variables eliminated, but lower bound = 1 > 0 and also Bad suffix .iis for _con N ABDULLAHI 8/25/16
high dimensional parameters with different levels Rupsana Parveen 8/24/16
RE: [AMPL 12460] Indexing over sets and time periods beginning Robert Fourer 8/24/16
Impossible deduce bounds N ABDULLAHI 8/24/16
expected ; . or number Milan Marinkovic 8/24/16
cplexamp considering QP Hessian as not positive semi-definite when it should be Peter Sels 8/24/16
or in param Milan Marinkovic 8/23/16
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