Sofia,

You should be using the latest version of GAMS: we are at 24.0.1 now. Possibly updating will fix things, or at least give you a better message. I don’t think it likely for this error.

Also, I don’t recommend that you use the gams() function to pass data. It makes it difficult to find and fix problems. Suggestions for a better approach are found here:

http://support.gams-software.com/doku.php?id=matlab_and_gams:interfacing_optimization_and_visualization_software_via_the_gdxmrw_utilities#how_can_i_construct_an_interface_between_gams_and_matlab

-Steve

On Mon, Jan 28, 2013 at 12:34 PM, Sofia wrote:

LL,

could you solve the problem because I have the same and I don’t know the reason.

El martes, 5 de abril de 2011 15:59:55 UTC-6, LL escribiÃ³:

Hi all,

I’m was trying to transfer some data between Matlab and

GAMS. The original GAMS model is the very typical example

from Dr. Steven Dirkse’s documentation.

$set matout "‘matsol.gdx’, x, dual ";

set i /1*2/,*

j /13/;

alias (j1,j);

parameter

Q(j,j1) /

1 .1 1.0

2 .2 1.0

3 .3 1.0 /,

A(i,j) /

1 .1 1.0

1 .2 1.0

1 .3 1.0

2 .1 -1.0

2 .3 1.0 /,

b(i) /

1 1.0

2 1.0 /,

c(j) /

1 2.0 /;

$if exist matdata.gms $include matdata.gms

variables obj;

positive variable x(j);

equation cost, dual(i);

cost… obj =e= 0.5*sum(j,x(j)*sum(j1,Q(j,j1)*x(j1))) +

sum(j,c(j)*x(j));

dual(i)… sum(j, A(i,j)*x(j)) =g= b(i);

model qp /cost,dual/;

solve qp using nlp minimizing obj;

execute_unload %matout%;

I want to replace the parameters of A, Q, b and c from

Matlab.

First, I successfully replaced A and Q by using the

following codes:

s.name = ‘A’; s.val = [1 1 2; -1 0 2]; s.type =

‘parameter’; s.form = ‘full’;

x = gams(‘qp_test’,s)

Then, I failed to replaced vector b and c by using both of

below codes:

- set b as column vector

s.name = ‘b’; s.val = [2.0; 2.0]; s.type = ‘parameter’;

s.form = ‘full’;

x = gams(‘qp_test’,s)

- set b as row vector

s.name = ‘b’; s.val = [2.0 2.0]; s.type = ‘parameter’;

s.form = ‘full’;

x = gams(‘qp_test’,s)

The errors of (1) and (2) are the same:

??? Error using ==> gams

abnormal GAMS termination running C:\Program

Files\GAMS23.6\gams.exe qp_test lo=0: check listing file

I checked the .lst file, but the hint information in .lst is

not helping at all.

Please help.

–

Best regards,

## Lili

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Steven Dirkse, Ph.D.

GAMS Development Corp., Washington DC

Voice: (202)342-0180 Fax: (202)342-0181

sdirkse@gams.com

http://www.gams.com