test whether a unit exists - Maple Help

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Units[HasUnit] - test whether a unit exists

Calling Sequence

HasUnit(unit, opts)

Parameters

unit

-

symbol; unit name

opts

-

(optional) equation(s) of the form option=value where option is 'display'; specify options

Description

• 

The HasUnit(unit) function returns true if the name is accepted as a unit name. Otherwise, false is returned.

  

 

  

'display'=truefalse

  

If this option is true and the unit unit is accepted as a valid unit name, the default spelling with context is returned instead of true. Otherwise, false is returned.

Examples

withUnits:

HasUnit'cm'

true

(1)

HasUnit'mileUS_survey'

true

(2)

HasUnit'Ω','display'=true

ohmcontexts:-SI

(3)

HasUnit'ω'

false

(4)

See Also

type/unit_name, Units, Units/Commands, Units/Index, Units[AddUnit], Units[GetUnit], Units[GetUnits]


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