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Instance: pooling_adhya1pq

PQ formulation of pooling problem. Explicitly added RLT constraints were removed from the original formulation of Alfaki and Haugland.
Formats ams gms lp mod nl osil pip
Primal Bounds (infeas ≤ 1e-08)
-549.80305020 p1 ( gdx sol )
(infeas: 9e-16)
Other points (infeas > 1e-08)  
Dual Bounds
-549.80306990 (ANTIGONE)
-549.80306190 (BARON)
-549.80305030 (LINDO)
-549.80308330 (SCIP)
References Adhya, Nilanjan, Tawarmalani, Mohit, and Sahinidis, Nikolaos V., A Lagrangian Approach to the Pooling Problem, Industrial & Engineering Chemistry Research, 38:5, 1999, 1956-1972.
Alfaki, Mohammed and Haugland, Dag, Strong formulations for the pooling problem, Journal of Global Optimization, 56:3, 2013, 897-916.
Source Adhya1.gms from Standard Pooling Problem Instances
Application Pooling problem
Added to library 12 Sep 2017
Problem type QCP
#Variables 33
#Binary Variables 0
#Integer Variables 0
#Nonlinear Variables 13
#Nonlinear Binary Variables 0
#Nonlinear Integer Variables 0
Objective Sense min
Objective type linear
Objective curvature linear
#Nonzeros in Objective 19
#Nonlinear Nonzeros in Objective 0
#Constraints 49
#Linear Constraints 29
#Quadratic Constraints 20
#Polynomial Constraints 0
#Signomial Constraints 0
#General Nonlinear Constraints 0
Operands in Gen. Nonlin. Functions  
Constraints curvature indefinite
#Nonzeros in Jacobian 197
#Nonlinear Nonzeros in Jacobian 40
#Nonzeros in (Upper-Left) Hessian of Lagrangian 40
#Nonzeros in Diagonal of Hessian of Lagrangian 0
#Blocks in Hessian of Lagrangian 2
Minimal blocksize in Hessian of Lagrangian 6
Maximal blocksize in Hessian of Lagrangian 7
Average blocksize in Hessian of Lagrangian 6.5
#Semicontinuities 0
#Nonlinear Semicontinuities 0
#SOS type 1 0
#SOS type 2 0
Infeasibility of initial point 1
Sparsity Jacobian Sparsity of Objective Gradient and Jacobian
Sparsity Hessian of Lagrangian Sparsity of Hessian of Lagrangian

$offlisting
*  
*  Equation counts
*      Total        E        G        L        N        X        C        B
*         50       23        0       27        0        0        0        0
*  
*  Variable counts
*                   x        b        i      s1s      s2s       sc       si
*      Total     cont   binary  integer     sos1     sos2    scont     sint
*         34       34        0        0        0        0        0        0
*  FX      0
*  
*  Nonzero counts
*      Total    const       NL      DLL
*        217      177       40        0
*
*  Solve m using NLP minimizing objvar;


Variables  objvar,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12,x13,x14,x15,x16,x17,x18
          ,x19,x20,x21,x22,x23,x24,x25,x26,x27,x28,x29,x30,x31,x32,x33,x34;

Positive Variables  x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12,x13,x14,x15,x16,x17
          ,x18,x19,x20,x21,x22,x23,x24,x25,x26,x27,x28,x29,x30,x31,x32,x33,x34;

Equations  e1,e2,e3,e4,e5,e6,e7,e8,e9,e10,e11,e12,e13,e14,e15,e16,e17,e18,e19
          ,e20,e21,e22,e23,e24,e25,e26,e27,e28,e29,e30,e31,e32,e33,e34,e35,e36
          ,e37,e38,e39,e40,e41,e42,e43,e44,e45,e46,e47,e48,e49,e50;


e1..    objvar + 9*x15 + 18*x16 + 8*x17 + 3*x18 + 13*x19 + 22*x20 + 12*x21
      + 7*x22 + 14*x23 + 23*x24 + 13*x25 + 8*x26 + 6*x27 + 15*x28 + 5*x29
      + 11*x31 + 20*x32 + 10*x33 + 5*x34 =E= 0;

e2..    x15 + x16 + x17 + x18 =L= 75;

e3..    x19 + x20 + x21 + x22 =L= 75;

e4..    x23 + x24 + x25 + x26 =L= 75;

e5..    x27 + x28 + x29 + x30 =L= 75;

e6..    x31 + x32 + x33 + x34 =L= 75;

e7..    x15 + x16 + x17 + x18 + x19 + x20 + x21 + x22 =L= 75;

e8..    x23 + x24 + x25 + x26 + x27 + x28 + x29 + x30 + x31 + x32 + x33 + x34
      =L= 75;

e9..    x15 + x19 + x23 + x27 + x31 =L= 10;

e10..    x16 + x20 + x24 + x28 + x32 =L= 25;

e11..    x17 + x21 + x25 + x29 + x33 =L= 30;

e12..    x18 + x22 + x26 + x30 + x34 =L= 10;

e13..  - 2*x15 + x19 + x23 - 2*x31 =L= 0;

e14..    3*x15 - 2*x19 + 2.5*x23 - 0.3*x31 =L= 0;

e15..    0.75*x15 - 0.25*x19 - 0.25*x23 - 0.25*x27 + 0.75*x31 =L= 0;

e16..  - 0.25*x15 + 1.25*x19 + 0.15*x23 + 0.25*x27 + 0.85*x31 =L= 0;

e17..  - 3*x16 - x28 - 3*x32 =L= 0;

e18..    3.5*x16 - 1.5*x20 + 3*x24 + 0.5*x28 + 0.2*x32 =L= 0;

e19..    0.5*x16 - 0.5*x20 - 0.5*x24 - 0.5*x28 + 0.5*x32 =L= 0;

e20..  - x16 + 0.5*x20 - 0.6*x24 - 0.5*x28 + 0.1*x32 =L= 0;

e21..  - 0.5*x17 + 2.5*x21 + 2.5*x25 + 1.5*x29 - 0.5*x33 =L= 0;

e22..    0.5*x17 - 4.5*x21 - 2.5*x29 - 2.8*x33 =L= 0;

e23..    0.1*x17 - 0.9*x21 - 0.9*x25 - 0.9*x29 + 0.1*x33 =L= 0;

e24..  - 0.3*x17 + 1.2*x21 + 0.1*x25 + 0.2*x29 + 0.8*x33 =L= 0;

e25..  - 2*x18 + x22 + x26 - 2*x34 =L= 0;

e26..    2*x18 - 3*x22 + 1.5*x26 - x30 - 1.3*x34 =L= 0;

e27..  - x22 - x26 - x30 =L= 0;

e28..  - 1.3*x18 + 0.2*x22 - 0.9*x26 - 0.8*x30 - 0.2*x34 =L= 0;

e29..    x2 + x3 =E= 1;

e30..    x4 + x5 + x6 =E= 1;

e31.. -x2*x7 + x15 =E= 0;

e32.. -x2*x8 + x16 =E= 0;

e33.. -x2*x9 + x17 =E= 0;

e34.. -x2*x10 + x18 =E= 0;

e35.. -x3*x7 + x19 =E= 0;

e36.. -x3*x8 + x20 =E= 0;

e37.. -x3*x9 + x21 =E= 0;

e38.. -x3*x10 + x22 =E= 0;

e39.. -x4*x11 + x23 =E= 0;

e40.. -x4*x12 + x24 =E= 0;

e41.. -x4*x13 + x25 =E= 0;

e42.. -x4*x14 + x26 =E= 0;

e43.. -x5*x11 + x27 =E= 0;

e44.. -x5*x12 + x28 =E= 0;

e45.. -x5*x13 + x29 =E= 0;

e46.. -x5*x14 + x30 =E= 0;

e47.. -x6*x11 + x31 =E= 0;

e48.. -x6*x12 + x32 =E= 0;

e49.. -x6*x13 + x33 =E= 0;

e50.. -x6*x14 + x34 =E= 0;

* set non-default bounds
x2.up = 1;
x3.up = 1;
x4.up = 1;
x5.up = 1;
x6.up = 1;
x7.up = 10;
x8.up = 25;
x9.up = 30;
x10.up = 10;
x11.up = 10;
x12.up = 25;
x13.up = 30;
x14.up = 10;
x15.up = 10;
x16.up = 25;
x17.up = 30;
x18.up = 10;
x19.up = 10;
x20.up = 25;
x21.up = 30;
x22.up = 10;
x23.up = 10;
x24.up = 25;
x25.up = 30;
x26.up = 10;
x27.up = 10;
x28.up = 25;
x29.up = 30;
x30.up = 10;
x31.up = 10;
x32.up = 25;
x33.up = 30;
x34.up = 10;

Model m / all /;

m.limrow=0; m.limcol=0;
m.tolproj=0.0;

$if NOT '%gams.u1%' == '' $include '%gams.u1%'

$if not set NLP $set NLP NLP
Solve m using %NLP% minimizing objvar;


Last updated: 2019-07-12 Git hash: 46a7b4f1
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