Package org.apache.commons.math.linear

Class AbstractRealVector

java.lang.Object

org.apache.commons.math.linear.AbstractRealVector

All Implemented Interfaces:

RealVector

Direct Known Subclasses:

ArrayRealVector, OpenMapRealVector

public abstract class AbstractRealVector
extends Object
implements RealVector

This class provides default basic implementations for many methods in the RealVector interface.

Since:

2.1

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.commons.math.linear.RealVector

RealVector.Entry

Constructor Summary

Constructors

Constructor	Description
AbstractRealVector()

Method Summary

Modifier and Type	Method	Description
RealVector	add(double[] v)	Compute the sum of this vector and v.
RealVector	add(RealVector v)	Compute the sum of this vector and v.
abstract AbstractRealVector	copy()	Returns a (deep) copy of this vector.
double	dotProduct(double[] v)	Compute the dot product.
double	dotProduct(RealVector v)	Compute the dot product.
RealVector	ebeDivide(double[] v)	Element-by-element division.
RealVector	ebeMultiply(double[] v)	Element-by-element multiplication.
double[]	getData()	Returns vector entries as a double array.
double	getDistance(double[] v)	Distance between two vectors.
double	getDistance(RealVector v)	Distance between two vectors.
double	getL1Distance(double[] v)	Distance between two vectors.
double	getL1Distance(RealVector v)	Distance between two vectors.
double	getL1Norm()	Returns the L1 norm of the vector.
double	getLInfDistance(double[] v)	Distance between two vectors.
double	getLInfDistance(RealVector v)	Distance between two vectors.
double	getLInfNorm()	Returns the L∞ norm of the vector.
int	getMaxIndex()	Get the index of the maximum entry.
double	getMaxValue()	Get the value of the maximum entry.
int	getMinIndex()	Get the index of the minimum entry.
double	getMinValue()	Get the value of the minimum entry.
double	getNorm()	Returns the L2 norm of the vector.
Iterator<RealVector.Entry>	iterator()	Generic dense iterator.
RealVector	map(UnivariateRealFunction function)	Acts as if implemented as:
RealVector	mapAbs()	Map the Math.abs(double) function to each entry.
RealVector	mapAbsToSelf()	Map the Math.abs(double) function to each entry.
RealVector	mapAcos()	Map the Math.acos(double) function to each entry.
RealVector	mapAcosToSelf()	Map the Math.acos(double) function to each entry.
RealVector	mapAdd(double d)	Add a value to each entry.
RealVector	mapAddToSelf(double d)	Add a value to each entry.
RealVector	mapAsin()	Map the Math.asin(double) function to each entry.
RealVector	mapAsinToSelf()	Map the Math.asin(double) function to each entry.
RealVector	mapAtan()	Map the Math.atan(double) function to each entry.
RealVector	mapAtanToSelf()	Map the Math.atan(double) function to each entry.
RealVector	mapCbrt()	Map the Math.cbrt(double) function to each entry.
RealVector	mapCbrtToSelf()	Map the Math.cbrt(double) function to each entry.
RealVector	mapCeil()	Map the Math.ceil(double) function to each entry.
RealVector	mapCeilToSelf()	Map the Math.ceil(double) function to each entry.
RealVector	mapCos()	Map the Math.cos(double) function to each entry.
RealVector	mapCosh()	Map the Math.cosh(double) function to each entry.
RealVector	mapCoshToSelf()	Map the Math.cosh(double) function to each entry.
RealVector	mapCosToSelf()	Map the Math.cos(double) function to each entry.
RealVector	mapDivide(double d)	Divide each entry.
RealVector	mapDivideToSelf(double d)	Divide each entry.
RealVector	mapExp()	Map the Math.exp(double) function to each entry.
RealVector	mapExpm1()	Map the Math.expm1(double) function to each entry.
RealVector	mapExpm1ToSelf()	Map the Math.expm1(double) function to each entry.
RealVector	mapExpToSelf()	Map Math.exp(double) operation to each entry.
RealVector	mapFloor()	Map the Math.floor(double) function to each entry.
RealVector	mapFloorToSelf()	Map the Math.floor(double) function to each entry.
RealVector	mapInv()	Map the 1/x function to each entry.
RealVector	mapInvToSelf()	Map the 1/x function to each entry.
RealVector	mapLog()	Map the Math.log(double) function to each entry.
RealVector	mapLog10()	Map the Math.log10(double) function to each entry.
RealVector	mapLog10ToSelf()	Map the Math.log10(double) function to each entry.
RealVector	mapLog1p()	Map the Math.log1p(double) function to each entry.
RealVector	mapLog1pToSelf()	Map the Math.log1p(double) function to each entry.
RealVector	mapLogToSelf()	Map the Math.log(double) function to each entry.
RealVector	mapMultiply(double d)	Multiply each entry.
RealVector	mapMultiplyToSelf(double d)	Multiply each entry.
RealVector	mapPow(double d)	Map a power operation to each entry.
RealVector	mapPowToSelf(double d)	Map a power operation to each entry.
RealVector	mapRint()	Map the Math.rint(double) function to each entry.
RealVector	mapRintToSelf()	Map the Math.rint(double) function to each entry.
RealVector	mapSignum()	Map the Math.signum(double) function to each entry.
RealVector	mapSignumToSelf()	Map the Math.signum(double) function to each entry.
RealVector	mapSin()	Map the Math.sin(double) function to each entry.
RealVector	mapSinh()	Map the Math.sinh(double) function to each entry.
RealVector	mapSinhToSelf()	Map the Math.sinh(double) function to each entry.
RealVector	mapSinToSelf()	Map the Math.sin(double) function to each entry.
RealVector	mapSqrt()	Map the Math.sqrt(double) function to each entry.
RealVector	mapSqrtToSelf()	Map the Math.sqrt(double) function to each entry.
RealVector	mapSubtract(double d)	Subtract a value from each entry.
RealVector	mapSubtractToSelf(double d)	Subtract a value from each entry.
RealVector	mapTan()	Map the Math.tan(double) function to each entry.
RealVector	mapTanh()	Map the Math.tanh(double) function to each entry.
RealVector	mapTanhToSelf()	Map the Math.tanh(double) function to each entry.
RealVector	mapTanToSelf()	Map the Math.tan(double) function to each entry.
RealVector	mapToSelf(UnivariateRealFunction function)	Acts as if it is implemented as:
RealVector	mapUlp()	Map the Math.ulp(double) function to each entry.
RealVector	mapUlpToSelf()	Map the Math.ulp(double) function to each entry.
RealMatrix	outerProduct(double[] v)	Compute the outer product.
RealMatrix	outerProduct(RealVector v)	Compute the outer product.
RealVector	projection(double[] v)	Find the orthogonal projection of this vector onto another vector.
void	set(double value)	Set all elements to a single value.
void	setSubVector(int index, double[] v)	Set a set of consecutive elements.
void	setSubVector(int index, RealVector v)	Set a set of consecutive elements.
Iterator<RealVector.Entry>	sparseIterator()	Specialized implementations may choose to not iterate over all dimensions, either because those values are unset, or are equal to defaultValue(), or are small enough to be ignored for the purposes of iteration.
RealVector	subtract(double[] v)	Subtract v from this vector.
RealVector	subtract(RealVector v)	Subtract v from this vector.
double[]	toArray()	Convert the vector to a double array.
void	unitize()	Converts this vector into a unit vector.
RealVector	unitVector()	Creates a unit vector pointing in the direction of this vector.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.commons.math.linear.RealVector

append, append, append, ebeDivide, ebeMultiply, getDimension, getEntry, getSubVector, isInfinite, isNaN, projection, setEntry

Constructor Details

AbstractRealVector

public AbstractRealVector()

Method Details

setSubVector

public void setSubVector(int index,
 RealVector v)
                  throws MatrixIndexException

Set a set of consecutive elements.

Specified by:

setSubVector in interface RealVector

Parameters:

index - index of first element to be set.

v - vector containing the values to set.

Throws:

MatrixIndexException

See Also:

• RealVector.setSubVector(int, double[])

setSubVector

public void setSubVector(int index,
 double[] v)
                  throws MatrixIndexException

Set a set of consecutive elements.

Specified by:

setSubVector in interface RealVector

Parameters:

index - index of first element to be set.

v - vector containing the values to set.

Throws:

MatrixIndexException

See Also:

• RealVector.setSubVector(int, RealVector)

add

public RealVector add(double[] v)
               throws IllegalArgumentException

Compute the sum of this vector and v.

Specified by:

add in interface RealVector

Parameters:

v - Vector to be added.

Returns:

this + v.

Throws:

IllegalArgumentException

add

public RealVector add(RealVector v)
               throws IllegalArgumentException

Compute the sum of this vector and v.

Specified by:

add in interface RealVector

Parameters:

v - Vector to be added.

Returns:

this + v.

Throws:

IllegalArgumentException

subtract

public RealVector subtract(double[] v)
                    throws IllegalArgumentException

Subtract v from this vector.

Specified by:

subtract in interface RealVector

Parameters:

v - Vector to be subtracted.

Returns:

this - v.

Throws:

IllegalArgumentException

subtract

public RealVector subtract(RealVector v)
                    throws IllegalArgumentException

Subtract v from this vector.

Specified by:

subtract in interface RealVector

Parameters:

v - Vector to be subtracted.

Returns:

this - v.

Throws:

IllegalArgumentException

mapAdd

public RealVector mapAdd(double d)

Add a value to each entry.

Specified by:

mapAdd in interface RealVector

Parameters:

d - Value to be added to each entry.

Returns:

this + d.

mapAddToSelf

public RealVector mapAddToSelf(double d)

Add a value to each entry. The instance is changed in-place.

Specified by:

mapAddToSelf in interface RealVector

Parameters:

d - Value to be added to each entry.

Returns:

this.

copy

public abstract AbstractRealVector copy()

Returns a (deep) copy of this vector.

Specified by:

copy in interface RealVector

Returns:

a vector copy.

dotProduct

public double dotProduct(double[] v)
                  throws IllegalArgumentException

Compute the dot product.

Specified by:

dotProduct in interface RealVector

Parameters:

v - vector with which dot product should be computed

Returns:

the scalar dot product between instance and v

Throws:

IllegalArgumentException

dotProduct

public double dotProduct(RealVector v)
                  throws IllegalArgumentException

Compute the dot product.

Specified by:

dotProduct in interface RealVector

Parameters:

v - vector with which dot product should be computed

Returns:

the scalar dot product between instance and v

Throws:

IllegalArgumentException

ebeDivide

public RealVector ebeDivide(double[] v)
                     throws IllegalArgumentException

Element-by-element division.

Specified by:

ebeDivide in interface RealVector

Parameters:

v - vector by which instance elements must be divided

Returns:

a vector containing this[i] / v[i] for all i

Throws:

IllegalArgumentException

ebeMultiply

public RealVector ebeMultiply(double[] v)
                       throws IllegalArgumentException

Element-by-element multiplication.

Specified by:

ebeMultiply in interface RealVector

Parameters:

v - vector by which instance elements must be multiplied

Returns:

a vector containing this[i] * v[i] for all i

Throws:

IllegalArgumentException

getDistance

public double getDistance(RealVector v)
                   throws IllegalArgumentException

Distance between two vectors.

This method computes the distance consistent with the L₂ norm, i.e. the square root of the sum of elements differences, or euclidian distance.

Specified by:

getDistance in interface RealVector

Parameters:

v - vector to which distance is requested

Returns:

distance between two vectors.

Throws:

IllegalArgumentException

See Also:

• RealVector.getL1Distance(RealVector)
• RealVector.getLInfDistance(RealVector)
• RealVector.getNorm()

getNorm

public double getNorm()

Returns the L₂ norm of the vector.

The L₂ norm is the root of the sum of the squared elements.

Specified by:

getNorm in interface RealVector

Returns:

norm

See Also:

• RealVector.getL1Norm()
• RealVector.getLInfNorm()
• RealVector.getDistance(RealVector)

getL1Norm

public double getL1Norm()

Returns the L₁ norm of the vector.

The L₁ norm is the sum of the absolute values of elements.

Specified by:

getL1Norm in interface RealVector

Returns:

norm

See Also:

• RealVector.getNorm()
• RealVector.getLInfNorm()
• RealVector.getL1Distance(RealVector)

getLInfNorm

public double getLInfNorm()

Returns the L_∞ norm of the vector.

The L_∞ norm is the max of the absolute values of elements.

Specified by:

getLInfNorm in interface RealVector

Returns:

norm

See Also:

• RealVector.getNorm()
• RealVector.getL1Norm()
• RealVector.getLInfDistance(RealVector)

getDistance

public double getDistance(double[] v)
                   throws IllegalArgumentException

Distance between two vectors.

This method computes the distance consistent with the L₂ norm, i.e. the square root of the sum of elements differences, or euclidian distance.

Specified by:

getDistance in interface RealVector

Parameters:

v - vector to which distance is requested

Returns:

distance between two vectors.

Throws:

IllegalArgumentException

See Also:

• RealVector.getL1Distance(double[])
• RealVector.getLInfDistance(double[])
• RealVector.getNorm()

getL1Distance

public double getL1Distance(RealVector v)
                     throws IllegalArgumentException

Distance between two vectors.

This method computes the distance consistent with L₁ norm, i.e. the sum of the absolute values of elements differences.

Specified by:

getL1Distance in interface RealVector

Parameters:

v - vector to which distance is requested

Returns:

distance between two vectors.

Throws:

IllegalArgumentException

See Also:

• RealVector.getDistance(RealVector)
• RealVector.getLInfDistance(RealVector)
• RealVector.getL1Norm()

getL1Distance

public double getL1Distance(double[] v)
                     throws IllegalArgumentException

Distance between two vectors.

This method computes the distance consistent with L₁ norm, i.e. the sum of the absolute values of elements differences.

Specified by:

getL1Distance in interface RealVector

Parameters:

v - vector to which distance is requested

Returns:

distance between two vectors.

Throws:

IllegalArgumentException

See Also:

• RealVector.getDistance(double[])
• RealVector.getLInfDistance(double[])
• RealVector.getL1Norm()

getLInfDistance

public double getLInfDistance(RealVector v)
                       throws IllegalArgumentException

Distance between two vectors.

This method computes the distance consistent with L_∞ norm, i.e. the max of the absolute values of elements differences.

Specified by:

getLInfDistance in interface RealVector

Parameters:

v - vector to which distance is requested

Returns:

distance between two vectors.

Throws:

IllegalArgumentException

See Also:

• RealVector.getDistance(RealVector)
• RealVector.getL1Distance(RealVector)
• RealVector.getLInfNorm()

getLInfDistance

public double getLInfDistance(double[] v)
                       throws IllegalArgumentException

Distance between two vectors.

This method computes the distance consistent with L_∞ norm, i.e. the max of the absolute values of elements differences.

Specified by:

getLInfDistance in interface RealVector

Parameters:

v - vector to which distance is requested

Returns:

distance between two vectors.

Throws:

IllegalArgumentException

See Also:

• RealVector.getDistance(double[])
• RealVector.getL1Distance(double[])
• RealVector.getLInfNorm()

getMinIndex

public int getMinIndex()

Get the index of the minimum entry.

Returns:

index of the minimum entry or -1 if vector length is 0 or all entries are NaN

getMinValue

public double getMinValue()

Get the value of the minimum entry.

Returns:

value of the minimum entry or NaN if all entries are NaN

getMaxIndex

public int getMaxIndex()

Get the index of the maximum entry.

Returns:

index of the maximum entry or -1 if vector length is 0 or all entries are NaN

getMaxValue

public double getMaxValue()

Get the value of the maximum entry.

Returns:

value of the maximum entry or NaN if all entries are NaN

mapAbs

public RealVector mapAbs()

Map the Math.abs(double) function to each entry.

Specified by:

mapAbs in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapAbsToSelf

public RealVector mapAbsToSelf()

Map the Math.abs(double) function to each entry.

The instance is changed by this method.

Specified by:

mapAbsToSelf in interface RealVector

Returns:

for convenience, return this

mapAcos

public RealVector mapAcos()

Map the Math.acos(double) function to each entry.

Specified by:

mapAcos in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapAcosToSelf

public RealVector mapAcosToSelf()

Map the Math.acos(double) function to each entry.

The instance is changed by this method.

Specified by:

mapAcosToSelf in interface RealVector

Returns:

for convenience, return this

mapAsin

public RealVector mapAsin()

Map the Math.asin(double) function to each entry.

Specified by:

mapAsin in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapAsinToSelf

public RealVector mapAsinToSelf()

Map the Math.asin(double) function to each entry.

The instance is changed by this method.

Specified by:

mapAsinToSelf in interface RealVector

Returns:

for convenience, return this

mapAtan

public RealVector mapAtan()

Map the Math.atan(double) function to each entry.

Specified by:

mapAtan in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapAtanToSelf

public RealVector mapAtanToSelf()

Map the Math.atan(double) function to each entry.

The instance is changed by this method.

Specified by:

mapAtanToSelf in interface RealVector

Returns:

for convenience, return this

mapCbrt

public RealVector mapCbrt()

Map the Math.cbrt(double) function to each entry.

Specified by:

mapCbrt in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapCbrtToSelf

public RealVector mapCbrtToSelf()

Map the Math.cbrt(double) function to each entry.

The instance is changed by this method.

Specified by:

mapCbrtToSelf in interface RealVector

Returns:

for convenience, return this

mapCeil

public RealVector mapCeil()

Map the Math.ceil(double) function to each entry.

Specified by:

mapCeil in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapCeilToSelf

public RealVector mapCeilToSelf()

Map the Math.ceil(double) function to each entry.

The instance is changed by this method.

Specified by:

mapCeilToSelf in interface RealVector

Returns:

for convenience, return this

mapCos

public RealVector mapCos()

Map the Math.cos(double) function to each entry.

Specified by:

mapCos in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapCosToSelf

public RealVector mapCosToSelf()

Map the Math.cos(double) function to each entry.

The instance is changed by this method.

Specified by:

mapCosToSelf in interface RealVector

Returns:

for convenience, return this

mapCosh

public RealVector mapCosh()

Map the Math.cosh(double) function to each entry.

Specified by:

mapCosh in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapCoshToSelf

public RealVector mapCoshToSelf()

Map the Math.cosh(double) function to each entry.

The instance is changed by this method.

Specified by:

mapCoshToSelf in interface RealVector

Returns:

for convenience, return this

mapDivide

public RealVector mapDivide(double d)

Divide each entry.

Specified by:

mapDivide in interface RealVector

Parameters:

d - Value to divide by.

Returns:

this / d.

mapDivideToSelf

public RealVector mapDivideToSelf(double d)

Divide each entry. The instance is changed in-place.

Specified by:

mapDivideToSelf in interface RealVector

Parameters:

d - Value to divide by.

Returns:

this.

mapExp

public RealVector mapExp()

Map the Math.exp(double) function to each entry.

Specified by:

mapExp in interface RealVector

Returns:

a mapped copy of the vector.

mapExpToSelf

public RealVector mapExpToSelf()

Map Math.exp(double) operation to each entry. The instance is changed in-place.

Specified by:

mapExpToSelf in interface RealVector

Returns:

the mapped vector.

mapExpm1

public RealVector mapExpm1()

Map the Math.expm1(double) function to each entry.

Specified by:

mapExpm1 in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapExpm1ToSelf

public RealVector mapExpm1ToSelf()

Map the Math.expm1(double) function to each entry.

The instance is changed by this method.

Specified by:

mapExpm1ToSelf in interface RealVector

Returns:

for convenience, return this

mapFloor

public RealVector mapFloor()

Map the Math.floor(double) function to each entry.

Specified by:

mapFloor in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapFloorToSelf

public RealVector mapFloorToSelf()

Map the Math.floor(double) function to each entry.

The instance is changed by this method.

Specified by:

mapFloorToSelf in interface RealVector

Returns:

for convenience, return this

mapInv

public RealVector mapInv()

Map the 1/x function to each entry.

Specified by:

mapInv in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapInvToSelf

public RealVector mapInvToSelf()

Map the 1/x function to each entry.

The instance is changed by this method.

Specified by:

mapInvToSelf in interface RealVector

Returns:

for convenience, return this

mapLog

public RealVector mapLog()

Map the Math.log(double) function to each entry.

Specified by:

mapLog in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapLogToSelf

public RealVector mapLogToSelf()

Map the Math.log(double) function to each entry.

The instance is changed by this method.

Specified by:

mapLogToSelf in interface RealVector

Returns:

for convenience, return this

mapLog10

public RealVector mapLog10()

Map the Math.log10(double) function to each entry.

Specified by:

mapLog10 in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapLog10ToSelf

public RealVector mapLog10ToSelf()

Map the Math.log10(double) function to each entry.

The instance is changed by this method.

Specified by:

mapLog10ToSelf in interface RealVector

Returns:

for convenience, return this

mapLog1p

public RealVector mapLog1p()

Map the Math.log1p(double) function to each entry.

Specified by:

mapLog1p in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapLog1pToSelf

public RealVector mapLog1pToSelf()

Map the Math.log1p(double) function to each entry.

The instance is changed by this method.

Specified by:

mapLog1pToSelf in interface RealVector

Returns:

for convenience, return this

mapMultiply

public RealVector mapMultiply(double d)

Multiply each entry.

Specified by:

mapMultiply in interface RealVector

Parameters:

d - Multiplication factor.

Returns:

this * d.

mapMultiplyToSelf

public RealVector mapMultiplyToSelf(double d)

Multiply each entry. The instance is changed in-place.

Specified by:

mapMultiplyToSelf in interface RealVector

Parameters:

d - Multiplication factor.

Returns:

this.

mapPow

public RealVector mapPow(double d)

Map a power operation to each entry.

Specified by:

mapPow in interface RealVector

Parameters:

d - Operator value.

Returns:

a mapped copy of the vector.

mapPowToSelf

public RealVector mapPowToSelf(double d)

Map a power operation to each entry. The instance is changed in-place.

Specified by:

mapPowToSelf in interface RealVector

Parameters:

d - Operator value.

Returns:

the mapped vector.

mapRint

public RealVector mapRint()

Map the Math.rint(double) function to each entry.

Specified by:

mapRint in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapRintToSelf

public RealVector mapRintToSelf()

Map the Math.rint(double) function to each entry.

The instance is changed by this method.

Specified by:

mapRintToSelf in interface RealVector

Returns:

for convenience, return this

mapSignum

public RealVector mapSignum()

Map the Math.signum(double) function to each entry.

Specified by:

mapSignum in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapSignumToSelf

public RealVector mapSignumToSelf()

Map the Math.signum(double) function to each entry.

The instance is changed by this method.

Specified by:

mapSignumToSelf in interface RealVector

Returns:

for convenience, return this

mapSin

public RealVector mapSin()

Map the Math.sin(double) function to each entry.

Specified by:

mapSin in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapSinToSelf

public RealVector mapSinToSelf()

Map the Math.sin(double) function to each entry.

The instance is changed by this method.

Specified by:

mapSinToSelf in interface RealVector

Returns:

for convenience, return this

mapSinh

public RealVector mapSinh()

Map the Math.sinh(double) function to each entry.

Specified by:

mapSinh in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapSinhToSelf

public RealVector mapSinhToSelf()

Map the Math.sinh(double) function to each entry.

The instance is changed by this method.

Specified by:

mapSinhToSelf in interface RealVector

Returns:

for convenience, return this

mapSqrt

public RealVector mapSqrt()

Map the Math.sqrt(double) function to each entry.

Specified by:

mapSqrt in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapSqrtToSelf

public RealVector mapSqrtToSelf()

Map the Math.sqrt(double) function to each entry.

The instance is changed by this method.

Specified by:

mapSqrtToSelf in interface RealVector

Returns:

for convenience, return this

mapSubtract

public RealVector mapSubtract(double d)

Subtract a value from each entry.

Specified by:

mapSubtract in interface RealVector

Parameters:

d - Value to be subtracted.

Returns:

this - d.

mapSubtractToSelf

public RealVector mapSubtractToSelf(double d)

Subtract a value from each entry. The instance is changed in-place.

Specified by:

mapSubtractToSelf in interface RealVector

Parameters:

d - Value to be subtracted.

Returns:

this.

mapTan

public RealVector mapTan()

Map the Math.tan(double) function to each entry.

Specified by:

mapTan in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapTanToSelf

public RealVector mapTanToSelf()

Map the Math.tan(double) function to each entry.

The instance is changed by this method.

Specified by:

mapTanToSelf in interface RealVector

Returns:

for convenience, return this

mapTanh

public RealVector mapTanh()

Map the Math.tanh(double) function to each entry.

Specified by:

mapTanh in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapTanhToSelf

public RealVector mapTanhToSelf()

Map the Math.tanh(double) function to each entry.

The instance is changed by this method.

Specified by:

mapTanhToSelf in interface RealVector

Returns:

for convenience, return this

mapUlp

public RealVector mapUlp()

Map the Math.ulp(double) function to each entry.

Specified by:

mapUlp in interface RealVector

Returns:

a vector containing the result of applying the function to each entry

mapUlpToSelf

public RealVector mapUlpToSelf()

Map the Math.ulp(double) function to each entry.

The instance is changed by this method.

Specified by:

mapUlpToSelf in interface RealVector

Returns:

for convenience, return this

outerProduct

public RealMatrix outerProduct(RealVector v)
                        throws IllegalArgumentException

Compute the outer product.

Specified by:

outerProduct in interface RealVector

Parameters:

v - vector with which outer product should be computed

Returns:

the square matrix outer product between instance and v

Throws:

IllegalArgumentException

outerProduct

public RealMatrix outerProduct(double[] v)
                        throws IllegalArgumentException

Compute the outer product.

Specified by:

outerProduct in interface RealVector

Parameters:

v - vector with which outer product should be computed

Returns:

the square matrix outer product between instance and v

Throws:

IllegalArgumentException

projection

public RealVector projection(double[] v)
                      throws IllegalArgumentException

Find the orthogonal projection of this vector onto another vector.

Specified by:

projection in interface RealVector

Parameters:

v - vector onto which instance must be projected

Returns:

projection of the instance onto v

Throws:

IllegalArgumentException

set

public void set(double value)

Set all elements to a single value.

Specified by:

set in interface RealVector

Parameters:

value - single value to set for all elements

toArray

public double[] toArray()

Convert the vector to a double array.

The array is independent from vector data, it's elements are copied.

Specified by:

toArray in interface RealVector

Returns:

array containing a copy of vector elements

getData

public double[] getData()

Returns vector entries as a double array.

Specified by:

getData in interface RealVector

Returns:

double array of entries

unitVector

public RealVector unitVector()

Creates a unit vector pointing in the direction of this vector.

The instance is not changed by this method.

Specified by:

unitVector in interface RealVector

Returns:

a unit vector pointing in direction of this vector

unitize

public void unitize()

Converts this vector into a unit vector.

The instance itself is changed by this method.

Specified by:

unitize in interface RealVector

sparseIterator

public Iterator<RealVector.Entry> sparseIterator()

Specialized implementations may choose to not iterate over all dimensions, either because those values are unset, or are equal to defaultValue(), or are small enough to be ignored for the purposes of iteration. No guarantees are made about order of iteration. In dense implementations, this method will often delegate to RealVector.iterator().

Specified by:

sparseIterator in interface RealVector

Returns:

a sparse iterator

iterator

public Iterator<RealVector.Entry> iterator()

Generic dense iterator. It iterates in increasing order of the vector index.

Specified by:

iterator in interface RealVector

Returns:

a dense iterator

map

public RealVector map(UnivariateRealFunction function)
               throws FunctionEvaluationException

Acts as if implemented as:

  return copy().map(function);
 

Specified by:

map in interface RealVector

Parameters:

function - Function to apply to each entry.

Returns:

a new vector.

Throws:

FunctionEvaluationException - if the function throws it.

mapToSelf

public RealVector mapToSelf(UnivariateRealFunction function)
                     throws FunctionEvaluationException

Acts as if it is implemented as:

  Entry e = null;
  for(Iterator it = iterator(); it.hasNext(); e = it.next()) {
      e.setValue(function.value(e.getValue()));
  }
 

Specified by:

mapToSelf in interface RealVector

Parameters:

function - Function to apply to each entry.

Returns:

this vector.

Throws:

FunctionEvaluationException - if the function throws it.