CPLEX cpxiptest
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This page is part of the CPLEX Manual. See CPLEX. |
Purpose
Test of the TOMLAB /CPLEX level 1 interface solving three larger integer linear optimization problems calling the CPLEX solver.
Calling Syntax
function cpxiptest(Cut, PreSolve, cpxControl)
Description of Input
| Input | Description |
|---|---|
| Cut | Value of the cut strategy parameters, default Cut = -1.
Cut = -1, auto select of Cut = 1 or Cut = 2. Cut = 0, no cuts. Cut = 1, conservative cut strategy. Cut = 2, aggressive cut strategy See CPLEX cpxbiptest. |
| PreSolve | Value of the PRESOLVE control parameter, default PreSolve = 1.
PreSolve = 0, no presolve. PreSolve = 1, do presolve. |
| cpxControl | The initial cpxControl structure. Here the user may set additional control parameter. Default empty. |
Global Parameters Used
| Output | Description |
|---|---|
| MAX_x | Maximal number of x elements printed in output statements. Default 20. |
| MAX_c | Maximal number of constraint elements printed in output statements. Default 20. |
Description
Test of three larger integer linear optimization problems calling the CPLEX solver. The test problems have 61 variables and 138 linear inequalities. 32 of the 138 inequalities are just zero rows in the matrix A. The three problems are stored in ilp061.mat, ilp062.mat and ilp063.mat.
Code is included to remove the 32 zero rows, and compute better upper bounds using the positivity of the matrix elements, right hand side and the variables. But this does not influence the timing much, the CPLEX presolve will do all these problem changes.
Timings are made with the Matlab functions tic and toc.
M-files Used
cplex, xprinti, cpxPrint
