SOS1

Ehsan Ghorbankhani

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Apr 28, 2016, 2:30:35 AM4/28/16

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Does anyone can help me to implement the SOS1 variables in gams

Positive variable

U

Vp

Vn

g

DualVar

U = (DualVar+(G-g))/2;

Vp-Vn = (DualVar-(G-g))/2;

U - (Vp+Vn) =0;

Although it doesn't give me any error but the solution is not correct.

Thank you.

Pedro Javier Ramírez Torrealba

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Apr 28, 2016, 4:55:35 AM4/28/16

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Dear Ehsan,

Please check the online documentation in www.gams.com, specifically:

https://www.gams.com/help/topic/gams.doc/userguides/mccarl/specially_ordered_set_variables_of_type_1_(sos1).htm?cp=0_2_1_20_0_2

Cheers,

Pedro

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PEDRO JAVIER RAMÍREZ TORREALBA
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Ehsan Ghorbankhani

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Apr 28, 2016, 6:12:49 AM4/28/16

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Dear Pedro

Thank you my friend. Unfortunately I can't find relation between the document mentioned in the gams user guide and my work.

My research is similar to the paper " An SOS1-Based Approach for Solving MPECs with a Natural Gas Market Application "

Pedro Javier Ramírez Torrealba

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Apr 28, 2016, 9:56:24 AM4/28/16

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Dear Ehsan,

I know that paper. In the GAMS website you can find information about how to define and use that type of variables. How to specifically use this type of variables depends on your model and what you want to achieve. Attached please find the link to another useful document where you can find further information about SOS1 and SOS2 and other integer programming tricks.

http://download.aimms.com/aimms/download/manuals/AIMMS3OM_IntegerProgrammingTricks.pdf

Cheers,

Pedro

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