Package org.djunits.quantity

Class Dimensionless

java.lang.Object

java.lang.Number

org.djunits.quantity.def.Quantity<Dimensionless>

org.djunits.quantity.Dimensionless

All Implemented Interfaces:

Serializable, Comparable<Dimensionless>, Additive<Dimensionless>, Scalable<Dimensionless>, Value<Dimensionless>

public class Dimensionless
extends Quantity<Dimensionless>

Dimensionless quantity.

Copyright (c) 2025-2026 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See for project information https://djunits.org. The DJUNITS project is distributed under a three-clause BSD-style license.

Author:

Alexander Verbraeck

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final Dimensionless	NaN	Constant with value NaN.
static final Dimensionless	NEG_MAXVALUE	Constant with value -MAX_VALUE.
static final Dimensionless	NEGATIVE_INFINITY	Constant with value NEGATIVE_INFINITY.
static final Dimensionless	ONE	Constant with value one.
static final Dimensionless	POS_MAXVALUE	Constant with value MAX_VALUE.
static final Dimensionless	POSITIVE_INFINITY	Constant with value POSITIVE_INFINITY.
static final Dimensionless	ZERO	Constant with value zero.

Fields inherited from class org.djunits.quantity.def.Quantity

si

Constructor Summary

Constructors

Constructor	Description
Dimensionless(double valueInUnit, Unitless unit)	Instantiate a Dimensionless quantity expressed in the given unit.
Dimensionless(double value, Unitless displayUnit, boolean useSi)	Instantiate a Dimensionless quantity with an SI or base value and a display unit.

Method Summary

Modifier and Type	Method	Description
Dimensionless	divide(Dimensionless v)	Calculate the division of Dimensionless and Dimensionless, which results in a Dimensionless quantity.
Frequency	divide(Duration v)	Calculate the division of Dimensionless and Duration, which results in a Frequency scalar.
ElectricalResistance	divide(ElectricalConductance v)	Calculate the division of Dimensionless and ElectricalConductance, which results in a ElectricalResistance scalar.
ElectricalConductance	divide(ElectricalResistance v)	Calculate the division of Dimensionless and ElectricalResistance, which results in a ElectricalConductance scalar.
Duration	divide(Frequency v)	Calculate the division of Dimensionless and Frequency, which results in a Duration scalar.
LinearObjectDensity	divide(Length v)	Calculate the division of Dimensionless and Length, which results in a LinearObjectDensity scalar.
Length	divide(LinearObjectDensity v)	Calculate the division of Dimensionless and LinearObjectDensity, which results in a Length scalar.
Unitless	getDisplayUnit()	Retrieve the unit of this Value.
Dimensionless	instantiateSi(double siValue, UnitInterface<Dimensionless> displayUnit)	Instantiate a quantity with an SI or base value, and a display unit.
static Dimensionless	of(double valueInUnit, String unitString)	Returns a Dimensionless based on a value and the textual representation of the unit, which can be localized.
static Dimensionless	of(double valueInUnit, Unitless unit)	Returns a Dimensionless based on a value expressed in the unit.
static Dimensionless	ofSi(double si)	Return a Dimensionless instance based on an SI value.
static Dimensionless	ofSi(double siValue, Unitless displayUnit)	Instantiate a Dimensionless quantity with an SI or base value and a display unit.
Dimensionless	reciprocal()	Return the reciprocal of this quantity (1/q).
static Dimensionless	valueOf(String text)	Returns a Dimensionless representation of a textual representation of a value with a unit.

Methods inherited from class org.djunits.quantity.def.Quantity

abs, add, as, compareTo, divide, doubleValue, eq, eq0, equals, floatValue, format, format, format, ge, ge0, getInUnit, getInUnit, getName, gt, gt0, hashCode, instantiate, instantiateSi, interpolate, intValue, isRelative, le, le0, longValue, lt, lt0, max, mean, min, multiply, ne, ne0, negate, of, product, scaleBy, si, siUnit, subtract, sum, toString, valueOf

Methods inherited from class java.lang.Number

byteValue, shortValue

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.djunits.value.Scalable

divideBy

Methods inherited from interface org.djunits.value.Value

isAbsolute

Field Details

ZERO

public static final Dimensionless ZERO

Constant with value zero.

ONE

public static final Dimensionless ONE

Constant with value one.

NaN

public static final Dimensionless NaN

Constant with value NaN.

POSITIVE_INFINITY

public static final Dimensionless POSITIVE_INFINITY

Constant with value POSITIVE_INFINITY.

NEGATIVE_INFINITY

public static final Dimensionless NEGATIVE_INFINITY

Constant with value NEGATIVE_INFINITY.

POS_MAXVALUE

public static final Dimensionless POS_MAXVALUE

Constant with value MAX_VALUE.

NEG_MAXVALUE

public static final Dimensionless NEG_MAXVALUE

Constant with value -MAX_VALUE.

Constructor Details

Dimensionless

public Dimensionless(double value,
 Unitless displayUnit,
 boolean useSi)

Instantiate a Dimensionless quantity with an SI or base value and a display unit.

Parameters:

value - the quantity value expressed in the SI or base unit

displayUnit - the display unit to use

useSi - use SI value when true, use value in unit when false

Dimensionless

public Dimensionless(double valueInUnit,
 Unitless unit)

Instantiate a Dimensionless quantity expressed in the given unit.

Parameters:

valueInUnit - the quantity value expressed in the given unit

unit - the unit of the value, also acts as the display unit

Method Details

ofSi

public static Dimensionless ofSi(double si)

Return a Dimensionless instance based on an SI value.

Parameters:

si - the si value

Returns:

the Dimensionless instance based on an SI value

ofSi

public static Dimensionless ofSi(double siValue,
 Unitless displayUnit)

Instantiate a Dimensionless quantity with an SI or base value and a display unit.

Parameters:

siValue - the quantity value expressed in the SI or base unit

displayUnit - the display unit to use

Returns:

the Dimensionless instance based on an SI value with the given display unit

instantiateSi

public Dimensionless instantiateSi(double siValue,
 UnitInterface<Dimensionless> displayUnit)

Description copied from class: Quantity

Instantiate a quantity with an SI or base value, and a display unit.

Specified by:

instantiateSi in class Quantity<Dimensionless>

Parameters:

siValue - the value expressed in the base (SI) unit

displayUnit - the display unit to use for the quantity

Returns:

a quantity with the given SI or base value, and the given display unit

valueOf

public static Dimensionless valueOf(String text)

Returns a Dimensionless representation of a textual representation of a value with a unit. The String representation that can be parsed is the double value in the unit, followed by a localized or English abbreviation of the unit. Spaces are allowed, but not required, between the value and the unit.

Parameters:

text - the textual representation to parse into a Dimensionless

Returns:

the Scalar representation of the value in its unit

Throws:

IllegalArgumentException - when the text cannot be parsed

NullPointerException - when the text argument is null

of

public static Dimensionless of(double valueInUnit,
 Unitless unit)

Returns a Dimensionless based on a value expressed in the unit.

Parameters:

valueInUnit - the value, expressed in the given unit

unit - the unit of the value, also acts as the display unit

Returns:

ab Dimensionless representation of the value in its unit

of

public static Dimensionless of(double valueInUnit,
 String unitString)

Returns a Dimensionless based on a value and the textual representation of the unit, which can be localized.

Parameters:

valueInUnit - the value, expressed in the unit as given by unitString

unitString - the textual representation of the unit

Returns:

the Scalar representation of the value in its unit

Throws:

IllegalArgumentException - when the unit cannot be parsed or is incorrect

NullPointerException - when the unitString argument is null

getDisplayUnit

public Unitless getDisplayUnit()

Description copied from interface: Value

Retrieve the unit of this Value.

Specified by:

getDisplayUnit in interface Value<Dimensionless>

Overrides:

getDisplayUnit in class Quantity<Dimensionless>

Returns:

the unit of this Value

divide

public Dimensionless divide(Dimensionless v)

Calculate the division of Dimensionless and Dimensionless, which results in a Dimensionless quantity.

Parameters:

v - quantity

Returns:

quantity as a division of Dimensionless and Dimensionless

divide

public LinearObjectDensity divide(Length v)

Calculate the division of Dimensionless and Length, which results in a LinearObjectDensity scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Dimensionless and Length

divide

public Length divide(LinearObjectDensity v)

Calculate the division of Dimensionless and LinearObjectDensity, which results in a Length scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Dimensionless and LinearObjectDensity

divide

public Frequency divide(Duration v)

Calculate the division of Dimensionless and Duration, which results in a Frequency scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Dimensionless and Duration

divide

public Duration divide(Frequency v)

Calculate the division of Dimensionless and Frequency, which results in a Duration scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Dimensionless and Frequency

divide

public ElectricalResistance divide(ElectricalConductance v)

Calculate the division of Dimensionless and ElectricalConductance, which results in a ElectricalResistance scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Dimensionless and ElectricalConductance

divide

public ElectricalConductance divide(ElectricalResistance v)

Calculate the division of Dimensionless and ElectricalResistance, which results in a ElectricalConductance scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Dimensionless and ElectricalResistance

reciprocal

public Dimensionless reciprocal()

Description copied from class: Quantity

Return the reciprocal of this quantity (1/q).

Overrides:

reciprocal in class Quantity<Dimensionless>

Returns:

the reciprocal of this quantity, with the correct SI units