Main

## Objective Variables

## Main.ObjectiveVariables History

Show minor edits - Show changes to output

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This obtains the current objective function value. An objective may consist of multiple objectives that are maximized or minimized. They are all converted to minimization functions and added together.

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This obtains the current objective function value with input arguments ''s=server'' and ''a=application name''. An objective may consist of multiple objectives that are maximized or minimized. They are all converted to minimization functions and added together.

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The %blue%A%red%P%black%Monitor objective is reported in the minimized form. Thus, a maximized objective with a result of +17 is reported as -17. ~~This~~ is retrieved as the parameter ''nlc.objfcnval'' in a programming script from the ''apm_tag'' function such as:

to:

The %blue%A%red%P%black%Monitor objective is reported in the minimized form. Thus, a maximized objective with a result of +17 is reported as -17.

!!! Retrieve Objective Function

The objective function is retrieved as the parameter ''nlc.objfcnval'' in a programming script from the ''apm_tag'' function such as:

!!! Retrieve Objective Function

The objective function is retrieved as the parameter ''nlc.objfcnval'' in a programming script from the ''apm_tag'' function such as:

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The objective function is always minimized with %blue%A%red%P%black%Monitor. ~~Objective function maximization~~ is accomplished by ~~defining a new variable that is the negative of the minimized~~ objective.

to:

The objective function is always minimized with %blue%A%red%P%black%Monitor. Maximizing an objective function is accomplished by minimizing the negative of the original objective.

! original objective

maximize z

The objective is modified by minimizing the negative of the original objective function.

! modified objective

minimize -z

The %blue%A%red%P%black%Monitor objective is reported in the minimized form. Thus, a maximized objective with a result of +17 is reported as -17. This is retrieved as the parameter ''nlc.objfcnval'' in a programming script from the ''apm_tag'' function such as:

obj = apm_tag(s,a,'nlc.objfcnval')

This obtains the current objective function value. An objective may consist of multiple objectives that are maximized or minimized. They are all converted to minimization functions and added together.

! original objective

maximize z

The objective is modified by minimizing the negative of the original objective function.

! modified objective

minimize -z

The %blue%A%red%P%black%Monitor objective is reported in the minimized form. Thus, a maximized objective with a result of +17 is reported as -17. This is retrieved as the parameter ''nlc.objfcnval'' in a programming script from the ''apm_tag'' function such as:

obj = apm_tag(s,a,'nlc.objfcnval')

This obtains the current objective function value. An objective may consist of multiple objectives that are maximized or minimized. They are all converted to minimization functions and added together.

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! Example model with an objective ~~function~~

Model example

~~ Parameters~~

~~p1 = 5~~

~~End Parameters~~

~~Variables~~

~~ objective~~

v1 > 6

End Variables

Equations

objective = (v1 -p1)^~~2~~

End Equations

End Model

Model example

v1 > 6

End Variables

Equations

objective = (v1 -

End Equations

End Model

to:

! Example model with an objective variable

Parameters

p1 = 5

Variables

objective

v1 > 6

Equations

objective = (v1 - p1)^2

Parameters

p1 = 5

Variables

objective

v1 > 6

Equations

objective = (v1 - p1)^2

Changed lines 36-51 from:

to:

! Equivalent model with a minimize objective statement

Parameters

p1 = 5

Variables

v1 > 6

Equations

minimize (v1 - p1)^2

(:cellnr:)

! Equivalent model with a maximize objective statement

Parameters

p1 = 5

Variables

v1 > 6

Equations

maximize -(v1 - p1)^2

(:cellnr:)

Parameters

p1 = 5

Variables

v1 > 6

Equations

minimize (v1 - p1)^2

(:cellnr:)

! Equivalent model with a maximize objective statement

Parameters

p1 = 5

Variables

v1 > 6

Equations

maximize -(v1 - p1)^2

(:cellnr:)

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(:table border=1 width=~~50~~% align=left bgcolor=#EEEEEE cellspacing=0:)

to:

(:table border=1 width=100% align=left bgcolor=#EEEEEE cellspacing=0:)

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!! Objective Variables

Objective variables are defined to construct an objective function. The objective function is a summation of all variables that are designated as objective-type. Variables are defined as objective function contributions by starting with '''obj'''. Thus, the variables ''obj1'', ''objective'', ''object[1]'' would be included in the objective function summation.

Additionally, slack variables are included in the objective function. These variables begin with the key letters '''slk''' and are defined with a lower bound of zero.

!!! Minimize vs. Maximize

The objective function is always minimized with %blue%A%red%P%black%Monitor. Objective function maximization is accomplished by defining a new variable that is the negative of the minimized objective.

!!! Example

(:table border=1 width=50% align=left bgcolor=#EEEEEE cellspacing=0:)

(:cellnr:)

! Example model with an objective function

Model example

Parameters

p1 = 5

End Parameters

Variables

objective

v1 > 6

End Variables

Equations

objective = (v1 - p1)^2

End Equations

End Model

Solution

p1 = 5

v1 = 6

objective = 1

(:tableend:)

Objective variables are defined to construct an objective function. The objective function is a summation of all variables that are designated as objective-type. Variables are defined as objective function contributions by starting with '''obj'''. Thus, the variables ''obj1'', ''objective'', ''object[1]'' would be included in the objective function summation.

Additionally, slack variables are included in the objective function. These variables begin with the key letters '''slk''' and are defined with a lower bound of zero.

!!! Minimize vs. Maximize

The objective function is always minimized with %blue%A%red%P%black%Monitor. Objective function maximization is accomplished by defining a new variable that is the negative of the minimized objective.

!!! Example

(:table border=1 width=50% align=left bgcolor=#EEEEEE cellspacing=0:)

(:cellnr:)

! Example model with an objective function

Model example

Parameters

p1 = 5

End Parameters

Variables

objective

v1 > 6

End Variables

Equations

objective = (v1 - p1)^2

End Equations

End Model

Solution

p1 = 5

v1 = 6

objective = 1

(:tableend:)