Where to find the CPLEX examples

Describes where to find the examples illustrating the use of OPL as a modeling and scripting language in the CPLEX Studio distribution.

This section presents examples that show how to use OPL as a modeling language and IBM ILOG Script for OPL as a scripting language. First look at the following tables, then find the examples you need from the following categories of problems.

Note:

The examples used in this documentation are designed to illustrate the features of the product. They should not be viewed as recommended methods or approaches for these problems.

All examples illustrating the use of OPL as a modeling and scripting language are in

<Install_dir>/opl/examples/opl

More optimization problems expressed as OPL models are available in

<Install_dir>/opl/examples/opl/models

and described in OPL model library.

The table titled Mathematical programming code examples presents an overview of the examples specifically written to illustrate OPL.

Legend:

The Problem column lists the types of problems in alphabetical order.
The Technique column specifies what kind of mathematical programming is applied in these models.
The Features column points out interesting characteristics or issues that OPL, as a modeling language, addresses in these examples.
The Project Location column specifies the directory that contains the corresponding project, model, and data files.
The Model File Name column provides direct links to the model files displayed in HTML format.

Abbreviations

Table 1. Mathematical Programming (MP) abbreviations
Abbreviation	Full form of the abbreviation
IP	Integer Programming
LP	Linear Programming
MILP	Mixed Integer Linear Programming
MIP	Mixed Integer Programming
MIQP	Mixed Integer Quadratic Programming
PWL	Piecewise Linear Programming
QCP	Quadratically Constrained Programming
QP	Quadratic Programming

Table 2. Mathematical programming examples
Problem	Technique	Features	Project Location	Model File Name
Blending problems	MILP	Branch and bound Logical constraints	examples/opl/blending examples/opl/foodmanufact examples/opl/oil	blending.mod foodmanufact.mod oil.mod
Commodity flow problems (transportation)	MIP	Sparsity Preprocessing script	examples/opl/transp	transp1.mod transp2.mod transp3.mod transp4.mod
Covering problems	IP	Resource Allocation	examples/opl/covering	covering.mod
Cutting stock problems	IP	Column Generation Flow control scripting Relaxation	examples/opl/cutstock	cutstock.mod cutstock-sub.mod cutstock_change.mod cutstock_main.mod cutstock_int_main.mod
Fixed-charge production problems	IP	Production expressed as integers	examples/opl/fixed examples/opl/prodmilp	fixed.mod prodmilp.mod
Inventory problems	PWL	Piecewise linear function	examples/opl/sailco	sailco.mod sailcopw.mod
Knapsack problems	IP	CPLEX priorities External knapsack algorithm	examples/opl/knapsack	knapsack.mod knapsackp.mod javaknapsack.mod
Miscellaneous examples	IP	int-to-float and float-to-int conversion of variables	examples/opl/convert_example	convert_example.mod
	IP	Setting an initial solution to the solver	examples/opl/warmstart	warmstart.mod
		Setting user’s preferences for conflict search	examples/opl/conflictIterator	conflictIterator.mod
		Setting user’s preferences for relaxation of conflicts	examples/opl/relaxationIterator	relaxationIterator.mod
	MIP	Quick start from OR to OPL	examples/opl/pmedian	pmedian.mod
		External function calls	examples/java/externaldataread	externaldataread.mod callexternaldataread.mod
	MIP	Multiple optimization of different models in a single environment	examples/opl/LagrangianRelaxation	LagrangianRelaxation.mod
Product mix problems	MILP	Data initialized in model file	examples/opl/gas examples/opl/volsay	gas.mod gas1.mod volsay.mod
Production problems	MILP LP	Tuples Named data Flow control script Spreadsheet, reading and writing data	examples/opl/production examples/opl/mulprod examples/opl/xsteel	production.mod product.mod mulprod.mod mulprod_change_main.mod mulprod_main.mod xsteel.mod
Profiling	MILP	Better time and memory consumption	examples/opl/profiler	profiler.mod
Quadratic problems	QP MIQP QP QCP		examples/opl/lifegameip examples/opl/miqpex1 examples/opl/qpex1 examples/opl/qcpex1	lifegameip.mod miqpex1.mod qpex1.mod qcpex1.mod
Relaxation of infeasible models	MIP	Scheduling Feasibility and relaxation	examples/opl/nurses	nurses.mod
Warehouse location problems	MIP	Internal data Scalability	examples/opl/warehouse	warehouse.mod scalableWarehouse.mod

The following table provides a synoptic view in which the examples are sorted by industry. Each table entry provides a link to a description of each type of problem.

Table 3. OPL examples library, by industry
Manufacturing	Supply chain	Time tabling	Transportation	Miscellaneous
Blending problems	Inventory problems	Covering problems	Commodity flow problems	Knapsack problems
Cutting stock problems			Profiling	Miscellaneous examples
Fixed-charge production problems			Warehouse location problems	Quadratic problems
Product mix problems				Relaxation of infeasible models
Production problems

The following table orders the examples by type of mathematical programming.

Table 4. OPL model library, by MP technique
Integer Programming	Linear Programming	Mixed Integer Linear Programming	Mixed Integer Programming	Quadratic Programming
examples/opl/convert_example	examples/opl/mulprod	examples/opl/blending	examples/opl/nurses	examples/opl/lifegameip
examples/opl/covering	examples/opl/xsteel	examples/opl/foodmanufact	examples/opl/pmedian	examples/opl/miqpex1
examples/opl/cutstock		examples/opl/gas	examples/opl/transp	examples/opl/qpex1
examples/opl/fixed		examples/opl/oil	examples/opl/warehouse	examples/opl/qcpex1
examples/opl/knapsack		examples/opl/production
examples/opl/prodmilp		examples/opl/profiler
examples/opl/sailco		examples/opl/volsay
examples/opl/warmstart