fixing a non square system in CNS

GAMS
1

Hi
I am working on a CGE model. I received this message

**** ERROR: CNS models must be square
This model contains 3270 equality rows and 3274 unfixed columns
MODEL STATISTICS

BLOCKS OF EQUATIONS 105 SINGLE EQUATIONS 3,270
BLOCKS OF VARIABLES 96 SINGLE VARIABLES 3,274
NON ZERO ELEMENTS 15,180 NON LINEAR N-Z 7,319
DERIVATIVE POOL 20 CONSTANT POOL 1,367
CODE LENGTH 20,968
SINGLE =E|X= EQUS 3,270 SINGLE UNFIXED VARS 3,274

How I could find the extra variables and fix the problem?

2

Hi

If you have your equations cast in the typical Arrow-Debreu-Format with zero-profit conditions, market clearing conditions and income definitions, the only thing you can do is to map your variables to these equations (e.g. respectively production level, prices and incomes) and see if the number of (non-fixed) mapped variables equals the number of equations. Note, that you might have auxiliary equations for defining variables used in other equations (like L(i) =E= …) for labor demand in a sector to be used in the market clearing equation.

Cheers
Renger

3

Dear Renger
Thank you!
I solved the problem.