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 4911 topics
ERROR: j is not defined Prashanth Cp 4:39 PM
Setting an specific variable value in a non defind Set Value The Flying Raccoons GT 3:10 PM
Don't know what else to do, i'm getting the same syntax error over and over again. Industrial Maximization Model. The Flying Raccoons GT 3:07 PM
VRP with split delivery, simultaneous pickup and delivery and heterogeneous fleet 12:11 PM
"Can't find file" 3:10 AM
problem "optimal integer solution within mipgap or absmipgap" between CPLEX and Gurobi 9/23/17
to read a dynamic range from an excel file with .xlsm extension 9/23/17
MINOS feasibility_tolerance parameter and an "infeasible problem" 9/23/17
Can't find file Mackenzie Via 9/23/17
testing for definedness Ketil Danielsen 9/22/17
Logical constraints Арсений Гринченко 9/22/17
cannot invoke XXX: no such program (for all solvers) 9/21/17
Need Help With Conditional Logic IF Y = 0 THEN Z = 0 Where Z is Integer Fulton Loebel 9/21/17
Piecewise linear purchasing models Chris Nytun 9/21/17
I dont know what could be the problem, please help. Getting the same syntax error over and over again. The Flying Raccoons GT 9/20/17
Variables already defined Angela Lee 9/20/17
Suggestions For TSP With Added Conditions Fulton Loebel 9/19/17
Problem with GAMS ignoring constraints Chicago 9/18/17
How to solve the error "exit code 18446744072635810101" when run my modle and solver 9/18/17
call the function in external libaray (dll) SG 9/18/17
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