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java.lang.Objectorg.apache.mahout.math.AbstractVector
org.apache.mahout.math.ConstantVector
public class ConstantVector
Implements a vector with all the same values.
| Nested Class Summary |
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| Nested classes/interfaces inherited from class org.apache.mahout.math.AbstractVector |
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AbstractVector.LocalElement |
| Nested classes/interfaces inherited from interface org.apache.mahout.math.Vector |
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Vector.Element |
| Field Summary |
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| Fields inherited from class org.apache.mahout.math.AbstractVector |
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lengthSquared |
| Constructor Summary | |
|---|---|
ConstantVector(double value,
int size)
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| Method Summary | |
|---|---|
double |
getIteratorAdvanceCost()
Gets an estimate of the cost (in number of operations) it takes to advance an iterator through the nonzero elements of this vector. |
double |
getLookupCost()
Gets an estimate of the cost (in number of operations) it takes to lookup a random element in this vector. |
int |
getNumNondefaultElements()
Return the number of values in the recipient |
double |
getQuick(int index)
Return the value at the given index, without checking bounds |
boolean |
isAddConstantTime()
Return true iff adding a new (nonzero) element takes constant time for this vector. |
boolean |
isDense()
|
boolean |
isSequentialAccess()
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Iterator<Vector.Element> |
iterateNonZero()
Iterates over all non-zero elements. |
Iterator<Vector.Element> |
iterator()
Iterates over all elements * NOTE: Implementations may choose to reuse the Element returned for performance reasons, so if you need a copy of it, you should call AbstractVector.getElement(int)
for the given index |
Vector |
like()
Return an empty vector of the same underlying class as the receiver |
protected Matrix |
matrixLike(int rows,
int columns)
Subclasses must override to return an appropriately sparse or dense result |
void |
mergeUpdates(OrderedIntDoubleMapping updates)
Used internally by assign() to update multiple indices and values at once. |
void |
setQuick(int index,
double value)
Set the value at the given index, without checking bounds |
| Methods inherited from class org.apache.mahout.math.AbstractVector |
|---|
aggregate, aggregate, all, asFormatString, assign, assign, assign, assign, assign, assign, clone, createOptimizedCopy, cross, divide, dot, dotSelf, equals, get, getDistanceSquared, getElement, getLengthSquared, getNumNonZeroElements, hashCode, incrementQuick, invalidateCachedLength, logNormalize, logNormalize, logNormalize, maxValue, maxValueIndex, minus, minValue, minValueIndex, nonZeroes, norm, normalize, normalize, plus, plus, set, size, sparseVectorToString, times, times, toString, toString, viewPart, zSum |
| Methods inherited from class java.lang.Object |
|---|
finalize, getClass, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
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public ConstantVector(double value,
int size)
| Method Detail |
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protected Matrix matrixLike(int rows,
int columns)
matrixLike in class AbstractVectorrows - the row cardinalitycolumns - the column cardinality
public void mergeUpdates(OrderedIntDoubleMapping updates)
updates - a mapping of indices to values to merge in the vector.public boolean isDense()
public boolean isSequentialAccess()
iterator() and iterateNonZero() return elements in ascending order by index.public Iterator<Vector.Element> iterator()
AbstractVector.getElement(int)
for the given index
iterator in class AbstractVectorIterator over all elementspublic Iterator<Vector.Element> iterateNonZero()
AbstractVector.getElement(int) for the given index
iterateNonZero in class AbstractVectorIterator over all non-zero elementspublic double getQuick(int index)
index - an int index
public Vector like()
public void setQuick(int index,
double value)
index - an int index into the receivervalue - a double value to setpublic int getNumNondefaultElements()
public double getLookupCost()
Vector
public double getIteratorAdvanceCost()
Vector
public boolean isAddConstantTime()
Vector
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