Package cern.colt.matrix.impl
Class RCMDoubleMatrix2D
java.lang.Object
cern.colt.PersistentObject
cern.colt.matrix.impl.AbstractMatrix
cern.colt.matrix.impl.AbstractMatrix2D
cern.colt.matrix.DoubleMatrix2D
cern.colt.matrix.impl.WrapperDoubleMatrix2D
cern.colt.matrix.impl.RCMDoubleMatrix2D
- All Implemented Interfaces:
Serializable
,Cloneable
Sparse row-compressed-modified 2-d matrix holding double elements.
- Version:
- 0.9, 04/14/2000
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Field Summary
FieldsFields inherited from class cern.colt.matrix.impl.WrapperDoubleMatrix2D
content
Fields inherited from class cern.colt.matrix.impl.AbstractMatrix2D
columns, columnStride, columnZero, rows, rowStride, rowZero
Fields inherited from class cern.colt.matrix.impl.AbstractMatrix
isNoView
Fields inherited from class cern.colt.PersistentObject
serialVersionUID
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Constructor Summary
ConstructorsConstructorDescriptionRCMDoubleMatrix2D
(double[][] values) Constructs a matrix with a copy of the given values.RCMDoubleMatrix2D
(int rows, int columns) Constructs a matrix with a given number of rows and columns. -
Method Summary
Modifier and TypeMethodDescriptionassign
(double value) Sets all cells to the state specified by value.protected DoubleMatrix2D
Returns the content of this matrix if it is a wrapper; or this otherwise.double
getQuick
(int row, int column) Returns the matrix cell value at coordinate [row,column].like
(int rows, int columns) Construct and returns a new empty matrix of the same dynamic type as the receiver, having the specified number of rows and columns.like1D
(int size) Construct and returns a new 1-d matrix of the corresponding dynamic type, entirelly independent of the receiver.void
setQuick
(int row, int column, double value) Sets the matrix cell at coordinate [row,column] to the specified value.protected void
zMult
(DoubleMatrix1D y, DoubleMatrix1D z, IntArrayList nonZeroIndexes, DoubleMatrix1D[] allRows, double alpha, double beta) Linear algebraic matrix-vector multiplication; z = A * y.Methods inherited from class cern.colt.matrix.impl.WrapperDoubleMatrix2D
like1D, viewColumn, viewColumnFlip, viewDice, viewPart, viewRow, viewRowFlip, viewSelection, viewSelectionLike, viewStrides
Methods inherited from class cern.colt.matrix.DoubleMatrix2D
aggregate, aggregate, assign, assign, assign, assign, cardinality, copy, equals, equals, forEachNonZero, get, getNonZeros, haveSharedCells, haveSharedCellsRaw, like, set, toArray, toString, view, viewSelection, viewSorted, zAssign8Neighbors, zMult, zMult, zMult, zMult, zSum
Methods inherited from class cern.colt.matrix.impl.AbstractMatrix2D
_columnOffset, _columnRank, _rowOffset, _rowRank, checkBox, checkColumn, checkColumnIndexes, checkRow, checkRowIndexes, checkShape, checkShape, columns, index, rows, setUp, setUp, size, toStringShort, vColumnFlip, vDice, vPart, vRowFlip, vStrides
Methods inherited from class cern.colt.matrix.impl.AbstractMatrix
ensureCapacity, isView, trimToSize
Methods inherited from class cern.colt.PersistentObject
clone
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Field Details
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indexes
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values
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Constructor Details
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RCMDoubleMatrix2D
public RCMDoubleMatrix2D(double[][] values) Constructs a matrix with a copy of the given values. values is required to have the form values[row][column] and have exactly the same number of columns in every row.The values are copied. So subsequent changes in values are not reflected in the matrix, and vice-versa.
- Parameters:
values
- The values to be filled into the new matrix.- Throws:
IllegalArgumentException
- if for any 1 <= row < values.length: values[row].length != values[row-1].length.
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RCMDoubleMatrix2D
public RCMDoubleMatrix2D(int rows, int columns) Constructs a matrix with a given number of rows and columns. All entries are initially 0.- Parameters:
rows
- the number of rows the matrix shall have.columns
- the number of columns the matrix shall have.- Throws:
IllegalArgumentException
- if rowsinvalid input: '<'0 || columnsinvalid input: '<'0 || (double)columns*rows > Integer.MAX_VALUE.
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Method Details
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assign
Sets all cells to the state specified by value.- Overrides:
assign
in classDoubleMatrix2D
- Parameters:
value
- the value to be filled into the cells.- Returns:
- this (for convenience only).
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getContent
Returns the content of this matrix if it is a wrapper; or this otherwise. Override this method in wrappers.- Overrides:
getContent
in classWrapperDoubleMatrix2D
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getQuick
public double getQuick(int row, int column) Returns the matrix cell value at coordinate [row,column].Provided with invalid parameters this method may return invalid objects without throwing any exception. You should only use this method when you are absolutely sure that the coordinate is within bounds. Precondition (unchecked): 0 <= column < columns() invalid input: '&'invalid input: '&' 0 <= row < rows().
- Overrides:
getQuick
in classWrapperDoubleMatrix2D
- Parameters:
row
- the index of the row-coordinate.column
- the index of the column-coordinate.- Returns:
- the value at the specified coordinate.
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like
Construct and returns a new empty matrix of the same dynamic type as the receiver, having the specified number of rows and columns. For example, if the receiver is an instance of type DenseDoubleMatrix2D the new matrix must also be of type DenseDoubleMatrix2D, if the receiver is an instance of type SparseDoubleMatrix2D the new matrix must also be of type SparseDoubleMatrix2D, etc. In general, the new matrix should have internal parametrization as similar as possible.- Overrides:
like
in classWrapperDoubleMatrix2D
- Parameters:
rows
- the number of rows the matrix shall have.columns
- the number of columns the matrix shall have.- Returns:
- a new empty matrix of the same dynamic type.
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like1D
Construct and returns a new 1-d matrix of the corresponding dynamic type, entirelly independent of the receiver. For example, if the receiver is an instance of type DenseDoubleMatrix2D the new matrix must be of type DenseDoubleMatrix1D, if the receiver is an instance of type SparseDoubleMatrix2D the new matrix must be of type SparseDoubleMatrix1D, etc.- Overrides:
like1D
in classWrapperDoubleMatrix2D
- Parameters:
size
- the number of cells the matrix shall have.- Returns:
- a new matrix of the corresponding dynamic type.
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setQuick
public void setQuick(int row, int column, double value) Sets the matrix cell at coordinate [row,column] to the specified value.Provided with invalid parameters this method may access illegal indexes without throwing any exception. You should only use this method when you are absolutely sure that the coordinate is within bounds. Precondition (unchecked): 0 <= column < columns() invalid input: '&'invalid input: '&' 0 <= row < rows().
- Overrides:
setQuick
in classWrapperDoubleMatrix2D
- Parameters:
row
- the index of the row-coordinate.column
- the index of the column-coordinate.value
- the value to be filled into the specified cell.
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zMult
protected void zMult(DoubleMatrix1D y, DoubleMatrix1D z, IntArrayList nonZeroIndexes, DoubleMatrix1D[] allRows, double alpha, double beta) Linear algebraic matrix-vector multiplication; z = A * y. z[i] = alpha*Sum(A[i,j] * y[j]) + beta*z[i], i=0..A.rows()-1, j=0..y.size()-1. Where A == this.- Parameters:
y
- the source vector.z
- the vector where results are to be stored.- Throws:
IllegalArgumentException
- if A.columns() != y.size() || A.rows() > z.size()).
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