What are the basic
functions of GAMSCHK?

How is GAMSCHK used
in a GAMS program?

How do I obtain
GAMSCHK?

How can I get
a copy of the latest writeup?

Basic Functions of GAMSCHK

Show me examples

- Display the structure of user selected equations and/or variables
- List the characteristics of selected groups of variables and equations
- List the characteristics of equation and variable blocks
- Examine a GAMS model to see whether any variables and equations contain specification errors
- Generate a schematic of the structure of the variable and equation blocks
- Examine the number of coeficients in the intersections of variable and equation blocks
- Look at the scaling characteristics of the variable and equation blocks
- Form a schematic for model components depicting the location of coefficients by sign and magnitude
- Reconstruct the reduced cost of variables after a model solution
- Reconstruct the activity within equations after a model solution
- Find variables or equations which could be causing unbounded or infeasible models

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How is GAMSCHK used in a GAMS
program? There are two elements to the use of GAMSCHK

- Modification of the GAMS program
- In the GAMS program you must make GAMSCHK the chosen solver by entering
a line like

option lp=gamschk;

The rest of the program is like any other GAMS model

- In the GAMS program you must make GAMSCHK the chosen solver by entering
a line like
- Creation of the gck file
- In addition GAMSCHK requires that the user indicate which procedures are to be employed. This is specified through the use of the *.GCK file where the * refers to the filename from the GAMS execution instruction. Thus if you are solving a model called trnsport you use a file called trnsport.gck.

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How do I obtain
GAMSCHK? GAMSCHK is a standard part of all GAMS releases.

If you
do not have a copy you need to update your system.

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How can I get a copy of the
latest writeup? GAMSCHK is a standard part of all GAMS releases. The
GAMSCHK manual is included in the Solver Manual Book

Also a current version
can be gotten from GAMSCHK Documentation

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