General GAMSCHK Information
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
Top of Document
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
- 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.
Top of Document
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
Top of Document
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
Top of Document