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How can I use part of an index

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Like one day have 24 hours, I need to calculate the variables for 24 periods, but these variables are defined by 25 points, so I define the index t as “25”.

 

For example variable A contains 24 elements, A(1) = B(2)-B(1)…...A(24)=B(25)-B(24).

 

 If I define an index “t” as 25, I can simply define the B as B(t) using t (1 to 25) as the domain. But How can i define A which only contains 24 elements, actually from 1 to 24, can I use part of t domain from 1 to 24?

 

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Best answer by Marcel Hunting 5 April 2023, 09:27

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2 replies

Marcel Hunting
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Userlevel 5
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Hi @Chunyang. You can use the domain condition t | t <> last(Periods) in the index domain of A:

 

Set Periods {
    Index: t;
    Definition: {
        { 1 .. 25 }
    }
}
Variable B {
    IndexDomain: t;
    Range: nonnegative;
}
Variable A {
    IndexDomain: t | t <> last(Periods);
    Range: nonnegative;
}

 

Marcel - AIMMS Optimization Specialist
C
Badge +4

Hi @Chunyang. You can use the domain condition t | t <> last(Periods) in the index domain of A:

 

Set Periods {
    Index: t;
    Definition: {
        { 1 .. 25 }
    }
}
Variable B {
    IndexDomain: t;
    Range: nonnegative;
}
Variable A {
    IndexDomain: t | t <> last(Periods);
    Range: nonnegative;
}

 

Thanks a lot!

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