Matlab <==> GAMS failed to transfer data

GAMS
1

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 /12/,
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:

  1. 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)

  1. 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


\

2

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 escribió:

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 /12/,
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:

  1. 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)

  1. 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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3

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 escribió:

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 /12/,
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:

  1. 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)

  1. 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

4

Have you solved this problem?

在 2013年1月29日星期二UTC+8上午1时34分11秒，Sofia写道：

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 escribió:

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 /12/,
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:

  1. 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)

  1. 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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For more options, visit https://groups.google.com/groups/opt_out.