SparseFieldVector (Apache Commons Math 3.6.1 API)

java.lang.Object
- org.apache.commons.math3.linear.SparseFieldVector<T>

Type Parameters:
T - the type of the field elements

All Implemented Interfaces:

Serializable, FieldVector<T>
```
public class SparseFieldVector<T extends FieldElement<T>>
extends Object
implements FieldVector<T>, Serializable
```
This class implements the FieldVector interface with a OpenIntToFieldHashMap backing store.
Caveat: This implementation assumes that, for any x, the equality x * 0d == 0d holds. But it is is not true for NaN. Moreover, zero entries will lose their sign. Some operations (that involve NaN and/or infinities) may thus give incorrect results.

Since:

2.0

See Also:
Serialized Form

Constructor Summary

Constructors
Modifier	Constructor and Description
	`SparseFieldVector(Field<T> field)` Build a 0-length vector.
	`SparseFieldVector(Field<T> field, int dimension)` Construct a vector of zeroes.
	`SparseFieldVector(Field<T> field, int dimension, int expectedSize)` Build a vector with known the sparseness (for advanced use only).
	`SparseFieldVector(Field<T> field, T[] values)` Create from a Field array.
	`SparseFieldVector(SparseFieldVector<T> v)` Copy constructor.
`protected`	`SparseFieldVector(SparseFieldVector<T> v, int resize)` Build a resized vector, for use with append.

Method Summary

Methods
Modifier and Type	Method and Description
`FieldVector<T>`	`add(FieldVector<T> v)` Compute the sum of `this` and `v`.
`FieldVector<T>`	`add(SparseFieldVector<T> v)` Optimized method to add sparse vectors.
`FieldVector<T>`	`append(FieldVector<T> v)` Construct a vector by appending a vector to this vector.
`FieldVector<T>`	`append(SparseFieldVector<T> v)` Construct a vector by appending a vector to this vector.
`FieldVector<T>`	`append(T d)` Construct a vector by appending a T to this vector.
`protected void`	`checkVectorDimensions(int n)` Check if instance dimension is equal to some expected value.
`FieldVector<T>`	`copy()` Returns a (deep) copy of this.
`T`	`dotProduct(FieldVector<T> v)` Compute the dot product.
`FieldVector<T>`	`ebeDivide(FieldVector<T> v)` Element-by-element division.
`FieldVector<T>`	`ebeMultiply(FieldVector<T> v)` Element-by-element multiplication.
`boolean`	`equals(Object obj)`
`T[]`	`getData()` Deprecated. as of 3.1, to be removed in 4.0. Please use the `toArray()` method instead.
`int`	`getDimension()` Returns the size of the vector.
`T`	`getEntry(int index)` Returns the entry in the specified index.
`Field<T>`	`getField()` Get the type of field elements of the vector.
`FieldVector<T>`	`getSubVector(int index, int n)` Get a subvector from consecutive elements.
`int`	`hashCode()`
`FieldVector<T>`	`mapAdd(T d)` Map an addition operation to each entry.
`FieldVector<T>`	`mapAddToSelf(T d)` Map an addition operation to each entry.
`FieldVector<T>`	`mapDivide(T d)` Map a division operation to each entry.
`FieldVector<T>`	`mapDivideToSelf(T d)` Map a division operation to each entry.
`FieldVector<T>`	`mapInv()` Map the 1/x function to each entry.
`FieldVector<T>`	`mapInvToSelf()` Map the 1/x function to each entry.
`FieldVector<T>`	`mapMultiply(T d)` Map a multiplication operation to each entry.
`FieldVector<T>`	`mapMultiplyToSelf(T d)` Map a multiplication operation to each entry.
`FieldVector<T>`	`mapSubtract(T d)` Map a subtraction operation to each entry.
`FieldVector<T>`	`mapSubtractToSelf(T d)` Map a subtraction operation to each entry.
`FieldMatrix<T>`	`outerProduct(FieldVector<T> v)` Compute the outer product.
`FieldMatrix<T>`	`outerProduct(SparseFieldVector<T> v)` Optimized method to compute outer product when both vectors are sparse.
`FieldVector<T>`	`projection(FieldVector<T> v)` Find the orthogonal projection of this vector onto another vector.
`void`	`set(T value)` Set all elements to a single value.
`void`	`setEntry(int index, T value)` Set a single element.
`void`	`setSubVector(int index, FieldVector<T> v)` Set a set of consecutive elements.
`FieldVector<T>`	`subtract(FieldVector<T> v)` Compute `this` minus `v`.
`SparseFieldVector<T>`	`subtract(SparseFieldVector<T> v)` Optimized method to compute `this` minus `v`.
`T[]`	`toArray()` Convert the vector to a T array.
`T`	`walkInDefaultOrder(FieldVectorChangingVisitor<T> visitor)` Visits (and possibly alters) all entries of this vector in default order (increasing index).
`T`	`walkInDefaultOrder(FieldVectorChangingVisitor<T> visitor, int start, int end)` Visits (and possibly alters) some entries of this vector in default order (increasing index).
`T`	`walkInDefaultOrder(FieldVectorPreservingVisitor<T> visitor)` Visits (but does not alter) all entries of this vector in default order (increasing index).
`T`	`walkInDefaultOrder(FieldVectorPreservingVisitor<T> visitor, int start, int end)` Visits (but does not alter) some entries of this vector in default order (increasing index).
`T`	`walkInOptimizedOrder(FieldVectorChangingVisitor<T> visitor)` Visits (and possibly alters) all entries of this vector in optimized order.
`T`	`walkInOptimizedOrder(FieldVectorChangingVisitor<T> visitor, int start, int end)` Visits (and possibly change) some entries of this vector in optimized order.
`T`	`walkInOptimizedOrder(FieldVectorPreservingVisitor<T> visitor)` Visits (but does not alter) all entries of this vector in optimized order.
`T`	`walkInOptimizedOrder(FieldVectorPreservingVisitor<T> visitor, int start, int end)` Visits (but does not alter) some entries of this vector in optimized order.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - SparseFieldVector
```
public SparseFieldVector(Field<T> field)
```
    Build a 0-length vector. Zero-length vectors may be used to initialize construction of vectors by data gathering. We start with zero-length and use either the SparseFieldVector(SparseFieldVector, int) constructor or one of the append method (append(FieldVector) or append(SparseFieldVector)) to gather data into this vector.
    
    Parameters:
    field - Field to which the elements belong.
  - SparseFieldVector
```
public SparseFieldVector(Field<T> field,
                 int dimension)
```
    Construct a vector of zeroes.
    
    Parameters:
    field - Field to which the elements belong.
    dimension - Size of the vector.
  - SparseFieldVector
```
protected SparseFieldVector(SparseFieldVector<T> v,
                 int resize)
```
    Build a resized vector, for use with append.
    
    Parameters:
    v - Original vector
    resize - Amount to add.
  - SparseFieldVector
```
public SparseFieldVector(Field<T> field,
                 int dimension,
                 int expectedSize)
```
    Build a vector with known the sparseness (for advanced use only).
    
    Parameters:
    field - Field to which the elements belong.
    dimension - Size of the vector.
    expectedSize - Expected number of non-zero entries.
  - SparseFieldVector
```
public SparseFieldVector(Field<T> field,
                 T[] values)
                  throws NullArgumentException
```
    Create from a Field array. Only non-zero entries will be stored.
    
    Parameters:
    field - Field to which the elements belong.
    values - Set of values to create from.
    
    Throws:
    
    NullArgumentException - if values is null
  - SparseFieldVector
```
public SparseFieldVector(SparseFieldVector<T> v)
```
    Copy constructor.
    
    Parameters:
    v - Instance to copy.
- Method Detail
  - add
```
public FieldVector<T> add(SparseFieldVector<T> v)
                                           throws DimensionMismatchException
```
    Optimized method to add sparse vectors.
    
    Parameters:
    v - Vector to add.
    
    Returns:
    this + v.
    
    Throws:
    
    DimensionMismatchException - if v is not the same size as this.
  - append
```
public FieldVector<T> append(SparseFieldVector<T> v)
```
    Construct a vector by appending a vector to this vector.
    
    Parameters:
    v - Vector to append to this one.
    
    Returns:
    a new vector.
  - append
```
public FieldVector<T> append(FieldVector<T> v)
```
    Construct a vector by appending a vector to this vector.
    
    Specified by:
    
    append in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    v - vector to append to this one.
    
    Returns:
    a new vector
  - append
```
public FieldVector<T> append(T d)
                                              throws NullArgumentException
```
    Construct a vector by appending a T to this vector.
    
    Specified by:
    
    append in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    d - T to append.
    
    Returns:
    a new vector
    
    Throws:
    
    NullArgumentException - if d is null
  - copy
```
public FieldVector<T> copy()
```
    Returns a (deep) copy of this.
    
    Specified by:
    
    copy in interface FieldVector<T extends FieldElement<T>>
    
    Returns:
    vector copy
  - dotProduct
```
public T dotProduct(FieldVector<T> v)
                                     throws DimensionMismatchException
```
    Compute the dot product.
    
    Specified by:
    
    dotProduct in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    v - vector with which dot product should be computed
    
    Returns:
    the scalar dot product of this and v
    
    Throws:
    
    DimensionMismatchException - if v is not the same size as this
  - ebeDivide
```
public FieldVector<T> ebeDivide(FieldVector<T> v)
                                                 throws DimensionMismatchException,
                                                        MathArithmeticException
```
    Element-by-element division.
    
    Specified by:
    
    ebeDivide in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    v - vector by which instance elements must be divided
    
    Returns:
    a vector containing this[i] / v[i] for all i
    
    Throws:
    
    DimensionMismatchException - if v is not the same size as this
    
    MathArithmeticException - if one entry of v is zero.
  - ebeMultiply
```
public FieldVector<T> ebeMultiply(FieldVector<T> v)
                                                   throws DimensionMismatchException
```
    Element-by-element multiplication.
    
    Specified by:
    
    ebeMultiply in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    v - vector by which instance elements must be multiplied
    
    Returns:
    a vector containing this[i] * v[i] for all i
    
    Throws:
    
    DimensionMismatchException - if v is not the same size as this
  - getData
```
@Deprecated
public T[] getData()
```
    Deprecated. as of 3.1, to be removed in 4.0. Please use the toArray() method instead.
    
    Returns vector entries as a T array.
    
    Specified by:
    
    getData in interface FieldVector<T extends FieldElement<T>>
    
    Returns:
    T array of entries
  - getDimension
```
public int getDimension()
```
    Returns the size of the vector.
    
    Specified by:
    
    getDimension in interface FieldVector<T extends FieldElement<T>>
    
    Returns:
    size
  - getEntry
```
public T getEntry(int index)
                                   throws OutOfRangeException
```
    Returns the entry in the specified index.
    
    Specified by:
    
    getEntry in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    index - Index location of entry to be fetched.
    
    Returns:
    the vector entry at index.
    
    Throws:
    
    OutOfRangeException - if the index is not valid.
    See Also:
    FieldVector.setEntry(int, FieldElement)
  - getField
```
public Field<T> getField()
```
    Get the type of field elements of the vector.
    
    Specified by:
    
    getField in interface FieldVector<T extends FieldElement<T>>
    
    Returns:
    type of field elements of the vector
  - getSubVector
```
public FieldVector<T> getSubVector(int index,
                          int n)
                                                    throws OutOfRangeException,
                                                           NotPositiveException
```
    Get a subvector from consecutive elements.
    
    Specified by:
    
    getSubVector in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    index - index of first element.
    n - number of elements to be retrieved.
    
    Returns:
    a vector containing n elements.
    
    Throws:
    
    OutOfRangeException - if the index is not valid.
    
    NotPositiveException - if the number of elements if not positive.
  - mapAdd
```
public FieldVector<T> mapAdd(T d)
                                              throws NullArgumentException
```
    Map an addition operation to each entry.
    
    Specified by:
    
    mapAdd in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    d - value to be added to each entry
    
    Returns:
    this + d
    
    Throws:
    
    NullArgumentException - if d is null.
  - mapAddToSelf
```
public FieldVector<T> mapAddToSelf(T d)
                                                    throws NullArgumentException
```
    Map an addition operation to each entry.
    The instance is changed by this method.
    
    Specified by:
    
    mapAddToSelf in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    d - value to be added to each entry
    
    Returns:
    for convenience, return this
    
    Throws:
    
    NullArgumentException - if d is null.
  - mapDivide
```
public FieldVector<T> mapDivide(T d)
                                                 throws NullArgumentException,
                                                        MathArithmeticException
```
    Map a division operation to each entry.
    
    Specified by:
    
    mapDivide in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    d - value to divide all entries by
    
    Returns:
    this / d
    
    Throws:
    
    NullArgumentException - if d is null.
    
    MathArithmeticException - if d is zero.
  - mapDivideToSelf
```
public FieldVector<T> mapDivideToSelf(T d)
                                                       throws NullArgumentException,
                                                              MathArithmeticException
```
    Map a division operation to each entry.
    The instance is changed by this method.
    
    Specified by:
    
    mapDivideToSelf in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    d - value to divide all entries by
    
    Returns:
    for convenience, return this
    
    Throws:
    
    NullArgumentException - if d is null.
    
    MathArithmeticException - if d is zero.
  - mapInv
```
public FieldVector<T> mapInv()
                                              throws MathArithmeticException
```
    Map the 1/x function to each entry.
    
    Specified by:
    
    mapInv in interface FieldVector<T extends FieldElement<T>>
    
    Returns:
    a vector containing the result of applying the function to each entry.
    
    Throws:
    
    MathArithmeticException - if one of the entries is zero.
  - mapInvToSelf
```
public FieldVector<T> mapInvToSelf()
                                                    throws MathArithmeticException
```
    Map the 1/x function to each entry.
    The instance is changed by this method.
    
    Specified by:
    
    mapInvToSelf in interface FieldVector<T extends FieldElement<T>>
    
    Returns:
    for convenience, return this
    
    Throws:
    
    MathArithmeticException - if one of the entries is zero.
  - mapMultiply
```
public FieldVector<T> mapMultiply(T d)
                                                   throws NullArgumentException
```
    Map a multiplication operation to each entry.
    
    Specified by:
    
    mapMultiply in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    d - value to multiply all entries by
    
    Returns:
    this * d
    
    Throws:
    
    NullArgumentException - if d is null.
  - mapMultiplyToSelf
```
public FieldVector<T> mapMultiplyToSelf(T d)
                                                         throws NullArgumentException
```
    Map a multiplication operation to each entry.
    The instance is changed by this method.
    
    Specified by:
    
    mapMultiplyToSelf in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    d - value to multiply all entries by
    
    Returns:
    for convenience, return this
    
    Throws:
    
    NullArgumentException - if d is null.
  - mapSubtract
```
public FieldVector<T> mapSubtract(T d)
                                                   throws NullArgumentException
```
    Map a subtraction operation to each entry.
    
    Specified by:
    
    mapSubtract in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    d - value to be subtracted to each entry
    
    Returns:
    this - d
    
    Throws:
    
    NullArgumentException - if d is null
  - mapSubtractToSelf
```
public FieldVector<T> mapSubtractToSelf(T d)
                                                         throws NullArgumentException
```
    Map a subtraction operation to each entry.
    The instance is changed by this method.
    
    Specified by:
    
    mapSubtractToSelf in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    d - value to be subtracted to each entry
    
    Returns:
    for convenience, return this
    
    Throws:
    
    NullArgumentException - if d is null
  - outerProduct
```
public FieldMatrix<T> outerProduct(SparseFieldVector<T> v)
```
    Optimized method to compute outer product when both vectors are sparse.
    
    Parameters:
    v - vector with which outer product should be computed
    
    Returns:
    the matrix outer product between instance and v
  - outerProduct
```
public FieldMatrix<T> outerProduct(FieldVector<T> v)
```
    Compute the outer product.
    
    Specified by:
    
    outerProduct in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    v - vector with which outer product should be computed
    
    Returns:
    the matrix outer product between instance and v
  - projection
```
public FieldVector<T> projection(FieldVector<T> v)
                                                  throws DimensionMismatchException,
                                                         MathArithmeticException
```
    Find the orthogonal projection of this vector onto another vector.
    
    Specified by:
    
    projection in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    v - vector onto which this must be projected
    
    Returns:
    projection of this onto v
    
    Throws:
    
    DimensionMismatchException - if v is not the same size as this
    
    MathArithmeticException - if v is the null vector.
  - set
```
public void set(T value)
```
    Set all elements to a single value.
    
    Specified by:
    
    set in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    value - single value to set for all elements
    
    Throws:
    
    NullArgumentException - if value is null
  - setEntry
```
public void setEntry(int index,
            T value)
              throws NullArgumentException,
                     OutOfRangeException
```
    Set a single element.
    
    Specified by:
    
    setEntry in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    index - element index.
    value - new value for the element.
    
    Throws:
    
    NullArgumentException - if value is null
    
    OutOfRangeException - if the index is not valid.
    See Also:
    FieldVector.getEntry(int)
  - setSubVector
```
public void setSubVector(int index,
                FieldVector<T> v)
                  throws OutOfRangeException
```
    Set a set of consecutive elements.
    
    Specified by:
    
    setSubVector in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    index - index of first element to be set.
    v - vector containing the values to set.
    
    Throws:
    
    OutOfRangeException - if the index is not valid.
  - subtract
```
public SparseFieldVector<T> subtract(SparseFieldVector<T> v)
                                                      throws DimensionMismatchException
```
    Optimized method to compute this minus v.
    
    Parameters:
    v - vector to be subtracted
    
    Returns:
    this - v
    
    Throws:
    
    DimensionMismatchException - if v is not the same size as this.
  - subtract
```
public FieldVector<T> subtract(FieldVector<T> v)
                                                throws DimensionMismatchException
```
    Compute this minus v.
    
    Specified by:
    
    subtract in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    v - vector to be subtracted
    
    Returns:
    this - v
    
    Throws:
    
    DimensionMismatchException - if v is not the same size as this
  - toArray
```
public T[] toArray()
```
    Convert the vector to a T array.
    The array is independent from vector data, it's elements are copied.
    
    Specified by:
    
    toArray in interface FieldVector<T extends FieldElement<T>>
    
    Returns:
    array containing a copy of vector elements
  - checkVectorDimensions
```
protected void checkVectorDimensions(int n)
                              throws DimensionMismatchException
```
    Check if instance dimension is equal to some expected value.
    
    Parameters:
    n - Expected dimension.
    
    Throws:
    
    DimensionMismatchException - if the dimensions do not match.
  - add
```
public FieldVector<T> add(FieldVector<T> v)
                                           throws DimensionMismatchException
```
    Compute the sum of this and v.
    
    Specified by:
    
    add in interface FieldVector<T extends FieldElement<T>>
    
    Parameters:
    v - vector to be added
    
    Returns:
    this + v
    
    Throws:
    
    DimensionMismatchException - if v is not the same size as this
  - walkInDefaultOrder
```
public T walkInDefaultOrder(FieldVectorPreservingVisitor<T> visitor)
```
    Visits (but does not alter) all entries of this vector in default order (increasing index).
    
    Parameters:
    visitor - the visitor to be used to process the entries of this vector
    
    Returns:
    the value returned by FieldVectorPreservingVisitor.end() at the end of the walk
    Since:
    
    3.3
  - walkInDefaultOrder
```
public T walkInDefaultOrder(FieldVectorPreservingVisitor<T> visitor,
                   int start,
                   int end)
                                             throws NumberIsTooSmallException,
                                                    OutOfRangeException
```
    Visits (but does not alter) some entries of this vector in default order (increasing index).
    
    Parameters:
    visitor - visitor to be used to process the entries of this vector
    start - the index of the first entry to be visited
    end - the index of the last entry to be visited (inclusive)
    
    Returns:
    the value returned by FieldVectorPreservingVisitor.end() at the end of the walk
    
    Throws:
    
    NumberIsTooSmallException - if end < start.
    
    OutOfRangeException - if the indices are not valid.
    Since:
    
    3.3
  - walkInOptimizedOrder
```
public T walkInOptimizedOrder(FieldVectorPreservingVisitor<T> visitor)
```
    Visits (but does not alter) all entries of this vector in optimized order. The order in which the entries are visited is selected so as to lead to the most efficient implementation; it might depend on the concrete implementation of this abstract class.
    
    Parameters:
    visitor - the visitor to be used to process the entries of this vector
    
    Returns:
    the value returned by FieldVectorPreservingVisitor.end() at the end of the walk
    Since:
    
    3.3
  - walkInOptimizedOrder
```
public T walkInOptimizedOrder(FieldVectorPreservingVisitor<T> visitor,
                     int start,
                     int end)
                                               throws NumberIsTooSmallException,
                                                      OutOfRangeException
```
    Visits (but does not alter) some entries of this vector in optimized order. The order in which the entries are visited is selected so as to lead to the most efficient implementation; it might depend on the concrete implementation of this abstract class.
    
    Parameters:
    visitor - visitor to be used to process the entries of this vector
    start - the index of the first entry to be visited
    end - the index of the last entry to be visited (inclusive)
    
    Returns:
    the value returned by FieldVectorPreservingVisitor.end() at the end of the walk
    
    Throws:
    
    NumberIsTooSmallException - if end < start.
    
    OutOfRangeException - if the indices are not valid.
    Since:
    
    3.3
  - walkInDefaultOrder
```
public T walkInDefaultOrder(FieldVectorChangingVisitor<T> visitor)
```
    Visits (and possibly alters) all entries of this vector in default order (increasing index).
    
    Parameters:
    visitor - the visitor to be used to process and modify the entries of this vector
    
    Returns:
    the value returned by FieldVectorChangingVisitor.end() at the end of the walk
    Since:
    
    3.3
  - walkInDefaultOrder
```
public T walkInDefaultOrder(FieldVectorChangingVisitor<T> visitor,
                   int start,
                   int end)
                                             throws NumberIsTooSmallException,
                                                    OutOfRangeException
```
    Visits (and possibly alters) some entries of this vector in default order (increasing index).
    
    Parameters:
    visitor - visitor to be used to process the entries of this vector
    start - the index of the first entry to be visited
    end - the index of the last entry to be visited (inclusive)
    
    Returns:
    the value returned by FieldVectorChangingVisitor.end() at the end of the walk
    
    Throws:
    
    NumberIsTooSmallException - if end < start.
    
    OutOfRangeException - if the indices are not valid.
    Since:
    
    3.3
  - walkInOptimizedOrder
```
public T walkInOptimizedOrder(FieldVectorChangingVisitor<T> visitor)
```
    Visits (and possibly alters) all entries of this vector in optimized order. The order in which the entries are visited is selected so as to lead to the most efficient implementation; it might depend on the concrete implementation of this abstract class.
    
    Parameters:
    visitor - the visitor to be used to process the entries of this vector
    
    Returns:
    the value returned by FieldVectorChangingVisitor.end() at the end of the walk
    Since:
    
    3.3
  - walkInOptimizedOrder
```
public T walkInOptimizedOrder(FieldVectorChangingVisitor<T> visitor,
                     int start,
                     int end)
                                               throws NumberIsTooSmallException,
                                                      OutOfRangeException
```
    Visits (and possibly change) some entries of this vector in optimized order. The order in which the entries are visited is selected so as to lead to the most efficient implementation; it might depend on the concrete implementation of this abstract class.
    
    Parameters:
    visitor - visitor to be used to process the entries of this vector
    start - the index of the first entry to be visited
    end - the index of the last entry to be visited (inclusive)
    
    Returns:
    the value returned by FieldVectorChangingVisitor.end() at the end of the walk
    
    Throws:
    
    NumberIsTooSmallException - if end < start.
    
    OutOfRangeException - if the indices are not valid.
    Since:
    
    3.3
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - equals
```
public boolean equals(Object obj)
```
    Overrides:
    
    equals in class Object

Class SparseFieldVector<T extends FieldElement<T>>

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

SparseFieldVector

SparseFieldVector

SparseFieldVector

SparseFieldVector

SparseFieldVector

SparseFieldVector

Method Detail

add

append

append

append

copy

dotProduct

ebeDivide

ebeMultiply

getData

getDimension

getEntry

getField

getSubVector

mapAdd

mapAddToSelf

mapDivide

mapDivideToSelf

mapInv

mapInvToSelf

mapMultiply

mapMultiplyToSelf

mapSubtract

mapSubtractToSelf

outerProduct

outerProduct

projection

set

setEntry

setSubVector

subtract

subtract

toArray

checkVectorDimensions

add

walkInDefaultOrder

walkInDefaultOrder

walkInOptimizedOrder

walkInOptimizedOrder

walkInDefaultOrder

walkInDefaultOrder

walkInOptimizedOrder

walkInOptimizedOrder

hashCode

equals