AMPL

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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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Topics (5430)
Replies Last Post Views
[AMPL 14982] Any documentation on the MINOS "workspace_(total)" option? by antenucci.d
11
by antenucci.d
[AMPL 14945] Benders Decomposition (feasibility and optimality cut for each scenario) by TFaiz
3
by Robert Fourer-2
[AMPL 14916] Compiling the model takes much time: Any possibility for improvement? by simon_onair
4
by Robert Fourer-2
[AMPL 15000] AMPL/Gurobi: suboptimal solution by Fabian Wilschewski
1
by Robert Fourer-2
[AMPL 14997] AMPL and Big Data by adityajain2018
2
by adityajain2018
[AMPL 14998] cplexamp doesn't produced a solution file by haizul84.87
1
by Robert Fourer-2
[AMPL 14996] no value by Ratna S
0
by Ratna S
[AMPL 14979] Understandig how the command "writeprob" works by Luiza Real
1
by Robert Fourer-2
[AMPL 3400] Declare a 3-dimension variable or parameter in AMPL by Terry-108
8
by Robert Fourer-2
[AMPL 14973] AMPL LET command inside for-loop efficiency issue by jichen208
1
by Robert Fourer-2
[AMPL 14967] import txt file in to AMPL by Mallipeddi, Rakesh
1
by Robert Fourer-2
[AMPL 14967] Syntax Error Help with AMPL by Michael Buller
1
by Robert Fourer-2
[AMPL 14962] Pls help me to solve this in ampl by MANEESH C.R
1
by Robert Fourer-2
[AMPL 14957] New To AMPL: error with sum {i in VAR}, i not defined by Iago Merli
1
by Robert Fourer-2
[AMPL 14952] Nested if-then-else statement or multiple if-statements by louisperrault
1
by Robert Fourer-2
[AMPL 14959] QP Hessian is not positive semi-definite. by lin jiaxin
1
by Robert Fourer-2
[AMPL 14962] Help me to solve this in ampl by MANEESH C.R
0
by MANEESH C.R
[AMPL 14959] CPLEX 12.7.1.0: QP Hessian is not positive semi-definite. by lin jiaxin
0
by lin jiaxin
[AMPL 14957] New to AMPL, problem with {set i in X} i not defined by Iago Merli
0
by Iago Merli
[AMPL 14948] Different answers when running AMPL on different machines by mastura.mshariff
1
by Robert Fourer-2
[AMPL 14944] error processing constraint by Ratna S
1
by Robert Fourer-2
[AMPL 14942] Piecewise Linear Approximation formulation by danmo
3
by Robert Fourer-2
[AMPL 14946] binary variable by santi ayabaca
1
by Krishnendranath Mitr...
[AMPL 14936] AMPL Summation over a set by danmo
3
by Prabhupad Bharadwaj
[AMPL 14941] Need help in generalizing a constraint by Mdan 2591
0
by Mdan 2591
[AMPL 14939] IO exception error by Prabhupad Bharadwaj
1
by Robert Fourer-2
[AMPL 14933] Storing the output Gap and other by Baburam
2
by Baburam
RE: [AMPL 14937] help needed for the error: integer infeasible. by Robert Fourer-2
0
by Robert Fourer-2
[AMPL 14936] General constraint help by danmo
0
by danmo
[AMPL 14917] Error messages on simple lot sizing model by Stefan Gemperle
2
by Stefan Gemperle
[AMPL 7980] Store a feasible solution before completion by arrogan
7
by Baburam
[AMPL 14932] Dial a Ride problem by Prabhupad Bharadwaj
0
by Prabhupad Bharadwaj
[AMPL 14922] MINOS 5.51: unbounded (or badly scaled) problem by Bekir Kırkıcı
2
by Michael Saunders-3
[AMPL 14920] How to define a constrain using "or", eg: subject to r1: a = 1 or a = 2? by yiting.wang7
2
by Robert Fourer-2
[AMPL 14926] help needed for the error: integer infeasible. by RS
0
by RS
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