Class Sparse<T>

Sparse vector representation (in LibSVM format).
Inheritance
System.Object
Sparse<T>
Implements
System.ICloneable
System.Collections.Generic.IList<T>
System.Collections.Generic.ICollection<T>
System.Collections.Generic.IEnumerable<T>
System.Collections.IList
System.Collections.ICollection
System.Collections.IEnumerable
System.IFormattable
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
Namespace: Mars.Numerics
Assembly: Mars.Numerics.dll
Syntax
[Serializable]
public sealed class Sparse<T> : ICloneable, IList<T>, ICollection<T>, IEnumerable<T>, IList, ICollection, IEnumerable, IFormattable where T : IEquatable<T>
Type Parameters
Name Description
T The type for the non-zero elements in this vector.

Constructors

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Sparse()

Creates a sparse vector with zero elements.
Declaration
public Sparse()
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Sparse(Int32)

Creates a sparse vector with the maximum number of elements.
Declaration
public Sparse(int length)
Parameters
Type Name Description
System.Int32 length The maximum number of non-zero elements that this vector can accomodate.
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Sparse(Int32[], T[])

Creates a sparse vector from a vector of indices and a vector of values occuring at those indices.
Declaration
public Sparse(int[] indices, T[] values)
Parameters
Type Name Description
System.Int32[] indices The indices for non-zero entries.
T[] values The non-zero values happening at each index.

Properties

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Indices

Gets or sets the vector of indices indicating the location of the non-zero elements contained in this sparse vector.
Declaration
public int[] Indices { get; set; }
Property Value
Type Description
System.Int32[]
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Item[Int32]

Gets the the value stored at position i.
Declaration
public T this[int i] { get; set; }
Parameters
Type Name Description
System.Int32 i
Property Value
Type Description
T
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Length

Gets the maximum non-zero element index in the sparse vector.
Declaration
public int Length { get; }
Property Value
Type Description
System.Int32
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Values

Gets or sets the vector of values indicating which non-zero value happens at each position indicated in Indices.
Declaration
public T[] Values { get; set; }
Property Value
Type Description
T[]

Methods

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Clone()

Creates a new object that is a copy of the current instance.
Declaration
public object Clone()
Returns
Type Description
System.Object A new object that is a copy of this instance.
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CopyTo(T[], Int32)

Copies the elements of the System.Collections.Generic.ICollection<T> to an System.Array, starting at a particular System.Array index.
Declaration
public void CopyTo(T[] array, int arrayIndex)
Parameters
Type Name Description
T[] array The one-dimensional System.Array that is the destination of the elements copied from System.Collections.Generic.ICollection<T>. The System.Array must have zero-based indexing.
System.Int32 arrayIndex The zero-based index in array at which copying begins.
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IsFull()

Determines whether this Sparse vector has elements on all indices.
Declaration
public bool IsFull()
Returns
Type Description
System.Boolean true if this instance is full; otherwise, false.
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ToDense()

Converts this sparse vector to a dense vector of the given length.
Declaration
public T[] ToDense()
Returns
Type Description
T[]
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ToDense(Int32)

Converts this sparse vector to a dense vector of the given length.
Declaration
public T[] ToDense(int length)
Parameters
Type Name Description
System.Int32 length
Returns
Type Description
T[]
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ToSparse()

Converts this sparse vector to a sparse representation where the indices are intertwined with their corresponding values.
Declaration
public T[] ToSparse()
Returns
Type Description
T[]
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ToString()

Returns a System.String that represents this instance.
Declaration
public override string ToString()
Returns
Type Description
System.String A System.String that represents this instance.
Overrides
System.Object.ToString()
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ToString(String, IFormatProvider)

Returns a System.String that represents this instance.
Declaration
public string ToString(string format, IFormatProvider formatProvider)
Parameters
Type Name Description
System.String format The format.
System.IFormatProvider formatProvider The format provider.
Returns
Type Description
System.String A System.String that represents this instance.

Operators

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Implicit(Sparse<T> to Array)

Performs an implicit conversion from Sparse<T> to System.Array.
Declaration
public static implicit operator Array(Sparse<T> obj)
Parameters
Type Name Description
Sparse<T> obj
Returns
Type Description
System.Array

Explicit Interface Implementations

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ICollection<T>.Add(T)

Sparse vector representation (in LibSVM format).
Declaration
void ICollection<T>.Add(T item)
Parameters
Type Name Description
T item
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ICollection<T>.Clear()

Sparse vector representation (in LibSVM format).
Declaration
void ICollection<T>.Clear()
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ICollection<T>.Contains(T)

Sparse vector representation (in LibSVM format).
Declaration
bool ICollection<T>.Contains(T item)
Parameters
Type Name Description
T item
Returns
Type Description
System.Boolean
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ICollection<T>.Count

Sparse vector representation (in LibSVM format).
Declaration
int ICollection<T>.Count { get; }
Returns
Type Description
System.Int32
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ICollection<T>.IsReadOnly

Sparse vector representation (in LibSVM format).
Declaration
bool ICollection<T>.IsReadOnly { get; }
Returns
Type Description
System.Boolean
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ICollection<T>.Remove(T)

Sparse vector representation (in LibSVM format).
Declaration
bool ICollection<T>.Remove(T item)
Parameters
Type Name Description
T item
Returns
Type Description
System.Boolean
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IEnumerable<T>.GetEnumerator()

Sparse vector representation (in LibSVM format).
Declaration
IEnumerator<T> IEnumerable<T>.GetEnumerator()
Returns
Type Description
System.Collections.Generic.IEnumerator<T>
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IList<T>.IndexOf(T)

Sparse vector representation (in LibSVM format).
Declaration
int IList<T>.IndexOf(T item)
Parameters
Type Name Description
T item
Returns
Type Description
System.Int32
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IList<T>.Insert(Int32, T)

Sparse vector representation (in LibSVM format).
Declaration
void IList<T>.Insert(int index, T item)
Parameters
Type Name Description
System.Int32 index
T item
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IList<T>.Item[Int32]

Sparse vector representation (in LibSVM format).
Declaration
T IList<T>.this[int index] { get; set; }
Parameters
Type Name Description
System.Int32 index
Returns
Type Description
T
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IList<T>.RemoveAt(Int32)

Sparse vector representation (in LibSVM format).
Declaration
void IList<T>.RemoveAt(int index)
Parameters
Type Name Description
System.Int32 index
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ICollection.CopyTo(Array, Int32)

Sparse vector representation (in LibSVM format).
Declaration
void ICollection.CopyTo(Array array, int index)
Parameters
Type Name Description
System.Array array
System.Int32 index
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ICollection.Count

Sparse vector representation (in LibSVM format).
Declaration
int ICollection.Count { get; }
Returns
Type Description
System.Int32
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ICollection.IsSynchronized

Sparse vector representation (in LibSVM format).
Declaration
bool ICollection.IsSynchronized { get; }
Returns
Type Description
System.Boolean
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ICollection.SyncRoot

Sparse vector representation (in LibSVM format).
Declaration
object ICollection.SyncRoot { get; }
Returns
Type Description
System.Object
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IEnumerable.GetEnumerator()

Sparse vector representation (in LibSVM format).
Declaration
IEnumerator IEnumerable.GetEnumerator()
Returns
Type Description
System.Collections.IEnumerator
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IList.Add(Object)

Sparse vector representation (in LibSVM format).
Declaration
int IList.Add(object value)
Parameters
Type Name Description
System.Object value
Returns
Type Description
System.Int32
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IList.Clear()

Sparse vector representation (in LibSVM format).
Declaration
void IList.Clear()
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IList.Contains(Object)

Sparse vector representation (in LibSVM format).
Declaration
bool IList.Contains(object value)
Parameters
Type Name Description
System.Object value
Returns
Type Description
System.Boolean
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IList.IndexOf(Object)

Sparse vector representation (in LibSVM format).
Declaration
int IList.IndexOf(object value)
Parameters
Type Name Description
System.Object value
Returns
Type Description
System.Int32
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IList.Insert(Int32, Object)

Sparse vector representation (in LibSVM format).
Declaration
void IList.Insert(int index, object value)
Parameters
Type Name Description
System.Int32 index
System.Object value
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IList.IsFixedSize

Sparse vector representation (in LibSVM format).
Declaration
bool IList.IsFixedSize { get; }
Returns
Type Description
System.Boolean
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IList.IsReadOnly

Sparse vector representation (in LibSVM format).
Declaration
bool IList.IsReadOnly { get; }
Returns
Type Description
System.Boolean
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IList.Item[Int32]

Sparse vector representation (in LibSVM format).
Declaration
object IList.this[int index] { get; set; }
Parameters
Type Name Description
System.Int32 index
Returns
Type Description
System.Object
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IList.Remove(Object)

Sparse vector representation (in LibSVM format).
Declaration
void IList.Remove(object value)
Parameters
Type Name Description
System.Object value
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IList.RemoveAt(Int32)

Sparse vector representation (in LibSVM format).
Declaration
void IList.RemoveAt(int index)
Parameters
Type Name Description
System.Int32 index

Implements

System.ICloneable
System.Collections.Generic.IList<T>
System.Collections.Generic.ICollection<T>
System.Collections.Generic.IEnumerable<T>
System.Collections.IList
System.Collections.ICollection
System.Collections.IEnumerable
System.IFormattable

Extension Methods