Weird infeasibility listing

Question

Hi everyone,

Today I was running my energy model and I faced this weird infeasibility in the listing file:

balance_activities(Houses - Residential Terrace,2050) ..

    + 1 * tech_use(Res03_01,2050) + 1 * tech_use(Res03_02,2050) + 1 * tech_use(Res03_03,2050) + 1 * tech_use(Res03_04,2050)
    + 1 * tech_use(Res03_05,2050) >= 4060 ;  ****

    name                      lower   upper
    tech_use(Res03_01,2050)   0       0
    tech_use(Res03_02,2050)   0       0
    tech_use(Res03_03,2050)   0       0
    tech_use(Res03_04,2050)   0       0
    tech_use(Res03_05,2050)   0       4060.000

It seems the upper bound of tech_use(Res03_05,2050) is respecting the mentioned constraint as 4060.000 is larger than 4060. Do you have any idea why AIMMS arises this ifeasibility?

Thank you in advance.

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Hi @afattahi. AIMMS rounds the values shown in the listing file, so it might be that 4060.000 is actually 4059.9999. You can increase the precision by setting the option 'Listing number precision' to a higher value, e.g., 8.

Note: the option 'Constraint listing feasibility tolerance’ determines the feasibility tolerance used by the constraint listing.

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Marcel Hunting · Accepted Answer

Hi @afattahi. AIMMS rounds the values shown in the listing file, so it might be that 4060.000 is actually 4059.9999. You can increase the precision by setting the option 'Listing number precision' to a higher value, e.g., 8.

Note: the option 'Constraint listing feasibility tolerance’ determines the feasibility tolerance used by the constraint listing.

Reply

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