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java.lang.Objectorg.apache.mahout.math.AbstractMatrix
org.apache.mahout.math.SparseRowMatrix
public class SparseRowMatrix
sparse matrix with general element values whose rows are accessible quickly. Implemented as a row array of either SequentialAccessSparseVectors or RandomAccessSparseVectors.
Nested Class Summary |
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Nested classes/interfaces inherited from class org.apache.mahout.math.AbstractMatrix |
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AbstractMatrix.TransposeViewVector |
Field Summary |
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Fields inherited from class org.apache.mahout.math.AbstractMatrix |
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COL, columnLabelBindings, columns, ROW, rowLabelBindings, rows |
Constructor Summary | |
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SparseRowMatrix(int rows,
int columns)
Construct a matrix of the given cardinality, with rows defaulting to RandomAccessSparseVector implementation |
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SparseRowMatrix(int rows,
int columns,
boolean randomAccess)
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SparseRowMatrix(int rows,
int columns,
Vector[] rowVectors)
Construct a sparse matrix starting with the provided row vectors. |
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SparseRowMatrix(int rows,
int columns,
Vector[] vectors,
boolean shallowCopy,
boolean randomAccess)
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Method Summary | |
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Matrix |
assignColumn(int column,
Vector other)
Assign the other vector values to the column of the receiver |
Matrix |
assignRow(int row,
Vector other)
Assign the other vector values to the row of the receiver |
Matrix |
clone()
Return a copy of the recipient |
int[] |
getNumNondefaultElements()
Return the number of values in the recipient |
double |
getQuick(int row,
int column)
Return the value at the given indexes, without checking bounds |
Matrix |
like()
Return an empty matrix of the same underlying class as the receiver |
Matrix |
like(int rows,
int columns)
Returns an empty matrix of the same underlying class as the receiver and of the specified size. |
void |
setQuick(int row,
int column,
double value)
Set the value at the given index, without checking bounds |
Matrix |
transpose()
Return a new matrix that is the transpose of the receiver |
Matrix |
viewPart(int[] offset,
int[] size)
Return a view into part of a matrix. |
Vector |
viewRow(int row)
Returns a view of a row. |
Methods inherited from class org.apache.mahout.math.AbstractMatrix |
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aggregate, aggregateColumns, aggregateRows, asFormatString, assign, assign, assign, assign, assign, columnSize, determinant, divide, get, get, getColumnLabelBindings, getRowLabelBindings, iterateAll, iterator, minus, numCols, numRows, numSlices, plus, plus, rowSize, set, set, set, set, set, set, setColumnLabelBindings, setRowLabelBindings, times, times, times, timesSquared, toString, viewColumn, viewDiagonal, viewPart, zSum |
Methods inherited from class java.lang.Object |
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equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public SparseRowMatrix(int rows, int columns, Vector[] rowVectors)
rows
- The number of rows in the resultcolumns
- The number of columns in the resultrowVectors
- a Vector[] array of rowspublic SparseRowMatrix(int rows, int columns, boolean randomAccess)
public SparseRowMatrix(int rows, int columns, Vector[] vectors, boolean shallowCopy, boolean randomAccess)
public SparseRowMatrix(int rows, int columns)
rows
- columns
- Method Detail |
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public Matrix clone()
Matrix
clone
in interface Matrix
clone
in class AbstractMatrix
public double getQuick(int row, int column)
Matrix
row
- an int row indexcolumn
- an int column index
public Matrix like()
Matrix
public Matrix like(int rows, int columns)
Matrix
rows
- the int number of rowscolumns
- the int number of columnspublic void setQuick(int row, int column, double value)
Matrix
row
- an int row index into the receivercolumn
- an int column index into the receivervalue
- a double value to setpublic int[] getNumNondefaultElements()
Matrix
getNumNondefaultElements
in interface Matrix
getNumNondefaultElements
in class AbstractMatrix
public Matrix viewPart(int[] offset, int[] size)
Matrix
viewPart
in interface Matrix
viewPart
in class AbstractMatrix
offset
- an int[2] offset into the receiversize
- the int[2] size of the desired result
public Matrix assignColumn(int column, Vector other)
Matrix
column
- the int row to assignother
- a Vector
public Matrix assignRow(int row, Vector other)
Matrix
row
- the int row to assignother
- a Vector
public Vector viewRow(int row)
AbstractMatrix
viewRow
in interface Matrix
viewRow
in class AbstractMatrix
row
- an int row index
public Matrix transpose()
Matrix
transpose
in interface Matrix
transpose
in class AbstractMatrix
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