grid - balance - help with equation definition - error in GAMS

Archiver · July 2, 2013, 8:23am

Hi.

I need to define a grid. The grid has knots and at some knots.there is consumption.
The balance of what is transferred into a knot must be equal to the sum of what is going away plus consumption (if any).

I have the sets
i /K1, K2, K3, K4, K5/
j /K1, K2, K3, K4, K5/

Which means from and to a knot.

My equation to get the balance working:
eq1… sum(i, transportation(i,j)) =e= sum(j, transportation) + consumption(i,j)

But this gives me either uncontrolled set entered as constant or … is already under control.

Could you help me to define that equation correctely?

Thank you

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Archiver · July 2, 2013, 7:49pm

Î¤Î· Î¤ÏÎ¯Ï„Î·, 2 Î™Î¿Ï…Î»Î¯Î¿Ï… 2013 9:23:52 Ï€.Î¼. UTC+3, Î¿ Ï‡ÏÎ®ÏƒÏ„Î·Ï‚ rasa...@gmail.com ÎÎ³ÏÎ±ÏˆÎµ:

Hi.

I need to define a grid. The grid has knots and at some knots.there is consumption.
The balance of what is transferred into a knot must be equal to the sum of what is going away plus consumption (if any).

I have the sets
i /K1, K2, K3, K4, K5/
j /K1, K2, K3, K4, K5/

Which means from and to a knot.

My equation to get the balance working:
eq1… sum(i, transportation(i,j)) =e= sum(j, transportation) + consumption(i,j)

But this gives me either uncontrolled set entered as constant or … is already under control.

Could you help me to define that equation correctely?

Thank you

If you check this balance for every bus you must put eq1(i), and declare this with the same name

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Archiver · July 2, 2013, 10:09pm

Thank you.
Could you tell me what you mean by “declare this with the same name”?
I still don’t understand it

Am Dienstag, 2. Juli 2013 19:49:37 UTC+2 schrieb saosan:

Î¤Î· Î¤ÏÎ¯Ï„Î·, 2 Î™Î¿Ï…Î»Î¯Î¿Ï… 2013 9:23:52 Ï€.Î¼. UTC+3, Î¿ Ï‡ÏÎ®ÏƒÏ„Î·Ï‚ rasa...@gmail.com ÎÎ³ÏÎ±ÏˆÎµ:

Hi.

I need to define a grid. The grid has knots and at some knots.there is consumption.
The balance of what is transferred into a knot must be equal to the sum of what is going away plus consumption (if any).

I have the sets
i /K1, K2, K3, K4, K5/
j /K1, K2, K3, K4, K5/

Which means from and to a knot.

My equation to get the balance working:
eq1… sum(i, transportation(i,j)) =e= sum(j, transportation) + consumption(i,j)

But this gives me either uncontrolled set entered as constant or … is already under control.

Could you help me to define that equation correctely?

Thank you

If you check this balance for every bus you must put eq1(i), and declare this with the same name

–
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Archiver · July 2, 2013, 10:23pm

I made a mistake… It is called transport(i,j), I forgot that.
But I am still getting set is under control already with eq1(i) or uncontrolled set entered as constant.

Am Dienstag, 2. Juli 2013 19:49:37 UTC+2 schrieb saosan:

Î¤Î· Î¤ÏÎ¯Ï„Î·, 2 Î™Î¿Ï…Î»Î¯Î¿Ï… 2013 9:23:52 Ï€.Î¼. UTC+3, Î¿ Ï‡ÏÎ®ÏƒÏ„Î·Ï‚ rasa...@gmail.com ÎÎ³ÏÎ±ÏˆÎµ:

Hi.

I need to define a grid. The grid has knots and at some knots.there is consumption.
The balance of what is transferred into a knot must be equal to the sum of what is going away plus consumption (if any).

I have the sets
i /K1, K2, K3, K4, K5/
j /K1, K2, K3, K4, K5/

Which means from and to a knot.

My equation to get the balance working:
eq1… sum(i, transportation(i,j)) =e= sum(j, transportation) + consumption(i,j)

But this gives me either uncontrolled set entered as constant or … is already under control.

Could you help me to define that equation correctely?

Thank you

If you check this balance for every bus you must put eq1(i), and declare this with the same name

–
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Archiver · July 4, 2013, 9:15pm

I mean that at equation you should write eq(i) before to declare the equation. Generally, if you check one constraint for every i so you should be eq(i) etc

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