9.59 OrderedVariableList

The domain OrderedVariableList provides symbols which are restricted to a particular list and have a definite ordering. Those two features are specified by a List Symbol object that is the argument to the domain.

This is a sample ordering of three symbols.

ls:List Symbol:=['x,'a,'z]

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[x,a,z]

_{Type: List Symbol}

Let’s build the domain

Z:=OVAR ls

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OrderedVariableList[x,a,z]

_{Type: Domain}

How many variables does it have?

size()$Z

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3

_{Type: NonNegativeInteger}

They are (in the imposed order)

lv:=[index(i::PI)$Z for i in 1..size()$Z]

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[x,a,z]

_{Type: List OrderedVariableList [x,a,z]}

Check that the ordering is right

sorted?(>,lv)

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true

_{Type: Boolean}