Hello,

Please how can I access the emp.info file?

Thank you.

Tunde

On Friday, January 30, 2015 at 1:40:36 AM UTC-7, Lutz Westermann wrote:

Nazmi,

This error is caused by the last three lines of your emp.info file:

stage 2 y(‘2’) d(‘2’) p(i,‘2’) s(‘2’) inv(‘2’) Bal_eq(‘2’)

Sales_eq1(‘2’) Sales_eq2(‘2’)

stage 3 y(‘3’) d(‘3’) p(i,‘3’) s(‘3’) inv(‘3’) Bal_eq(‘3’)

Sales_eq1(‘3’) Sales_eq2(‘3’)

stage 4 y(‘4’) d(‘4’) p(i,‘4’) s(‘4’) inv(‘4’) Bal_eq(‘4’)

Sales_eq1(‘4’) Sales_eq2(‘4’)

You cannot use p(i,‘2’) here. You need to write out all possibilities.

So you can replace your $onput … $offput section by this one:

put / “stage 1 y(‘1’) inv(‘1’) Bal_eq(‘1’)”;

put / "stage 2 y(‘2’) d(‘2’) “;

loop(i, put p.tn(i,‘2’) ’ ');

put " s(‘2’) inv(‘2’) Bal_eq(‘2’) Sales_eq1(‘2’) Sales_eq2(‘2’)”;

put / "stage 3 y(‘3’) d(‘3’) “;

loop(i, put p.tn(i,‘3’) ’ ');

put " s(‘3’) inv(‘3’) Bal_eq(‘3’) Sales_eq1(‘3’) Sales_eq2(‘3’)”;

put / "stage 4 y(‘4’) d(‘4’) “;

loop(i, put p.tn(i,‘4’) ’ ');

put " s(‘4’) inv(‘4’) Bal_eq(‘4’) Sales_eq1(‘4’) Sales_eq2(‘4’)”;

However, please note that there is a bigger issue with your model. As I

can see it, you have 18 independent random variables, each with 1000

possible outcomes. This will result in 1000^18 scenarios which is just

too big to be handled.

Is this really what you had in mind or did you actually want to have

just 1000 scenarios? If this is the case, you should define your random

variables as joint random variables instead of independent random

variables. For more information please look for “jrandvar” in the

“Stochastic Programming (SP) with EMP” documentation, which you can find

in your installation folder or here:

http://www.gams.com/dd/docs/solvers/empsp/index.html

Best regards,

Lutz

On 1/30/2015 2:51 AM, Nazmi Åžener wrote:

Hi everybody,

I try to model multistage stochastic programming model. I get an error

which is

=C*** emp.info line 1402: Unknown uel: i

=C*** emp.info line 1402: Cannot find (random) variable or equation p in

model.

How can I solve this problem? I add model to attachment. I appreciate

your help and time.

Thanks in advance,

Nazmi

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