Inventory problem

GAMS
1

Hi everybody,

I’m new in the group, but I’ll try to help when I can …

My problem is:

I have 4 factories (p) that exchanging raw material between them and I want to control the inventory every day (t).

I created an alias:
alias(p,q);
And I have a variable x(p,q,t), that is the flow between the factories. How can I subtract x(p,q,t) to the inventory of factory p and sum x(p,q,t) to the inventory of factory q.

With the equation2, I can control the inventory that exit the factory, but how I take in account also the one that entry into the factory q?
eq2(p,t)… invp(p,t) =E= invp(p,t-1) + buy(p,t) - sum(q,x(p,q,t)) + InicialInvent(p,t);

I hope you understand my problem…


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2

Hi ASaLu !

eq2(p,t)… invp(p,t) =E= invp(p,t-1) + buy(p,t) - sum(q,x(p,q,t)) +
sum(q,x(q,p,t)) + InicialInvent(p,t);

adding the same inverted term should do the trick

Regards
Claudio

On Thu, Jan 30, 2014 at 8:50 AM, ASaLu wrote:

Hi everybody,

I’m new in the group, but I’ll try to help when I can …

My problem is:

I have 4 factories (p) that exchanging raw material between them and I want
to control the inventory every day (t).

I created an alias:
alias(p,q);
And I have a variable x(p,q,t), that is the flow between the factories. How
can I subtract x(p,q,t) to the inventory of factory p and sum x(p,q,t) to
the inventory of factory q.

With the equation2, I can control the inventory that exit the factory, but
how I take in account also the one that entry into the factory q?
eq2(p,t)… invp(p,t) =E= invp(p,t-1) + buy(p,t) - sum(q,x(p,q,t)) +
InicialInvent(p,t);

I hope you understand my problem…

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