Basic Functions of GAMSCHK

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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

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
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 it 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 in the Solver Manual Book
Also a current version can be gotten from mccarl's home page

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