Same variable with different index in constraints

Forum|Forum|3 years ago
September 12, 2022
3 replies
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Marco
Enthusiast
1 reply

Hello,

I have the variable u(i) specifiying the remaining cargo on arrival at vertex i.

I want to write the following constraint into AIMMS:

0 <= u(j) <= u(i) - q(i)x(i,j) + C(1-x(i,j))

Then I always get the message “The number of arguments in the variable u is not correct”

because of u(j) <= u(i).

Can you please help me to solve this problem.

Thanks

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+6

gabiservidone
AIMMSian
256 replies
Forum|Forum|3 years ago
September 12, 2022

Marco, can you send us the project you are working on here (support@aimms.com).

If not, can you screenshot the u(i) identifier definition?

Gabriela Servidone - AIMMS and Optimization Solutions Consultant

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Marco
Author
Enthusiast
1 reply
Forum|Forum|3 years ago
September 14, 2022

Thank you for your reply!

I have sent you the information by Email to support@aimms.com

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+6

gabiservidone
AIMMSian
256 replies
Forum|Forum|3 years ago
September 14, 2022

This question is being handled trought support, but here are some tips on how to start developing your own linear programming model.

This will teach you how to create a linear programming model. https://academy.aimms.com/mod/page/view.php?id=177
This will teach you how to add indexed and domain in your restrictions. https://academy.aimms.com/mod/page/view.php?id=821
This explains a little more about indexes. https://documentation.aimms.com/language-reference/non-procedural-language-components/set-declaration/set-declaration-and-attributes.html#indexed-sets
Local binding,-Local binding takes This explains how to use bindings on your code. https://documentation.aimms.com/language-reference/procedural-language-components/index-binding/binding-rules.html#:~:text=context binding.-

Gabriela Servidone - AIMMS and Optimization Solutions Consultant

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