Now that you have entered a problem using ILOG CPLEX, you must verify that the problem was entered correctly. To do so, use the display command. At the CPLEX> prompt type:

A list of the items that can be displayed then appears. Some of the options display parts of the problem description, while others display parts of the problem solution. Options about the problem solution are not available until after the problem has been solved. The list looks like this:

Display Options:

iis           display infeasibility diagnostics (IIS constraints)
problem       display problem characteristics
sensitivity   display sensitivity analysis
settings      display parameter settings
solution      display existing solution

Display what:

If you type problem in reply to that prompt, that option will list a set of problem characteristics, like this:

Display Problem Options:

all              display entire problem
binaries         display binary variables
bounds           display a set of bounds
constraints      display a set of constraints or node supply/demand values
generals         display general integer variables
histogram        display a histogram of row or column counts
integers         display integer variables
names            display names of variables or constraints
qpvariables      display quadratic variables
semi-continuous  display semi-continuous and semi-integer variables
sos              display special ordered sets
stats            display problem statistics
variable         display a column of the constraint matrix

Display which problem characteristic:

Enter the option all to display the entire problem.

Maximize
 obj: x1 + 2 x2 + 3 x3
Subject To
 c1: - x1 +   x2 +   x3 <= 20
 c2:  x1 - 3 x2 +   x3 <= 30
Bounds
 0 <= x1 <= 40
All other variables are >= 0.

The default names obj, c1, c2, are provided by ILOG CPLEX.

Summary

Display problem characteristics by entering the command: