Main Menu

Below is the main menu displayed at the beginning of a new session:

 *******************************************************
 *   This is SYMPHONY Version 5.7.1                    *
 *   Copyright 2000-2023 Ted Ralphs                    *
 *   All Rights Reserved.                              *
 *   Distributed under the Eclipse Public License 1.0  *
 *******************************************************

 ***** WELCOME TO SYMPHONY INTERACTIVE MIP SOLVER ******

 Please type 'help'/'?' to see the main commands!

 SYMPHONY:

When you type help or ?, a list of main commands is displayed:

 SYMPHONY: help

 List of main commands:

 load      : read a problem in mps or ampl format
 solve     : solve the problem
 lpsolve   : solve the lp relaxation of the problem
 set       : set a parameter
 display   : display optimization results and stats
 reset     : restart the optimizer
 help      : show the available commands/params/options

 quit/exit : leave the optimizer

 SYMPHONY:

Following is an illustration of a session to read in a sample instance:

 SYMPHONY: load 
 Name of the file: sample.mps
 Coin0001I At line 1 NAME SAMPLE
 Coin0001I At line 2 ROWS
 Coin0001I At line 6 COLUMNS
 Coin0001I At line 25 RHS
 Coin0001I At line 28 BOUNDS
 Coin0001I At line 34 ENDATA
 Coin0002I Problem SAMPLE has 2 rows, 6 columns and 10 elements
 SYMPHONY:

The format of the input file is recognized from the file extension. If there is none, you will be prompted to define the input format:

 SYMPHONY: load 
 Name of the file: sample
 Type of the file ('mps'/'ampl'/'gmpl'): mps 
 Coin0001I At line 1 NAME SAMPLE
 Coin0001I At line 2 ROWS
 Coin0001I At line 6 COLUMNS
 Coin0001I At line 25 RHS
 Coin0001I At line 28 BOUNDS
 Coin0001I At line 34 ENDATA
 Coin0002I Problem SAMPLE has 2 rows, 6 columns and 10 elements
 SYMPHONY:

If the input is in AMPL/GMPL format, you will also be prompted to read in a data file (note again that in order to enable GMPL/AMPL reader, you have to install GLPK—see Section 2.2)):

 SYMPHONY: load 
 Name of the file: sample.mod
 Name of the data file: sample.dat
 Reading model section from sample.mod...
 32 lines were read
 Reading data section from sample.dat...
 68 lines were read
 Generating nb...
 Generating cost...
 Model has been successfully generated
 SYMPHONY:

After loading the instance, type solve to solve the corresponding integer program or lpsolve to solve its linear relaxation:

 SYMPHONY: solve

 ****** Found Better Feasible Solution !
 ****** Cost: -40.000000


 ****************************************************
 * Optimal Solution Found                           *
 ****************************************************

 SYMPHONY: lpsolve

 ****** Found Better Feasible Solution !
 ****** Cost: -43.000000


 ****************************************************
 * Optimal Solution Found                           *
 ****************************************************

 SYMPHONY:

As above, only the objective values of the feasible solutions found so far and the termination code of the solution process will be displayed (see Section 3.1.4 for displaying more output).