cern.colt.matrix.tdouble

Class DoubleFactory1D

java.lang.Object

cern.colt.PersistentObject

cern.colt.matrix.tdouble.DoubleFactory1D

All Implemented Interfaces:

Serializable, Cloneable

public class DoubleFactory1D
extends PersistentObject

Factory for convenient construction of 1-d matrices holding double cells. Use idioms like DoubleFactory1D.dense.make(1000) to construct dense matrices, DoubleFactory1D.sparse.make(1000) to construct sparse matrices. If the factory is used frequently it might be useful to streamline the notation. For example by aliasing:

DoubleFactory1D F = DoubleFactory1D.dense; F.make(1000); F.descending(10); F.random(3); ...

Version:

1.0, 09/24/99

Author:

wolfgang.hoschek@cern.ch

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static DoubleFactory1D	dense A factory producing dense matrices.
static DoubleFactory1D	sparse A factory producing sparse matrices.

Method Summary

Methods

Modifier and Type	Method and Description
DoubleMatrix1D	append(DoubleMatrix1D A, DoubleMatrix1D B) C = A||B; Constructs a new matrix which is the concatenation of two other matrices.
DoubleMatrix1D	ascending(int size) Constructs a matrix with cells having ascending values.
DoubleMatrix1D	descending(int size) Constructs a matrix with cells having descending values.
DoubleMatrix1D	make(AbstractDoubleList values) Constructs a matrix from the values of the given list.
DoubleMatrix1D	make(double[] values) Constructs a matrix with the given cell values.
DoubleMatrix1D	make(DoubleMatrix1D[] parts) Constructs a matrix which is the concatenation of all given parts.
DoubleMatrix1D	make(int size) Constructs a matrix with the given shape, each cell initialized with zero.
DoubleMatrix1D	make(int size, double initialValue) Constructs a matrix with the given shape, each cell initialized with the given value.
DoubleMatrix1D	random(int size) Constructs a matrix with uniformly distributed values in (0,1) (exclusive).
DoubleMatrix1D	repeat(DoubleMatrix1D A, int repeat) C = A||A||..||A; Constructs a new matrix which is concatenated repeat times.
DoubleMatrix1D	sample(int size, double value, double nonZeroFraction) Constructs a randomly sampled matrix with the given shape.
DoubleArrayList	toList(DoubleMatrix1D values) Constructs a list from the given matrix.

Methods inherited from class cern.colt.PersistentObject

clone

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

dense

public static final DoubleFactory1D dense

A factory producing dense matrices.

sparse

public static final DoubleFactory1D sparse

A factory producing sparse matrices.

Method Detail

append

public DoubleMatrix1D append(DoubleMatrix1D A,
                    DoubleMatrix1D B)

C = A||B; Constructs a new matrix which is the concatenation of two other matrices. Example: 0 1 append 3 4 --> 0 1 3 4.

ascending

public DoubleMatrix1D ascending(int size)

Constructs a matrix with cells having ascending values. For debugging purposes. Example: 0 1 2

descending

public DoubleMatrix1D descending(int size)

Constructs a matrix with cells having descending values. For debugging purposes. Example: 2 1 0

make

public DoubleMatrix1D make(AbstractDoubleList values)

Constructs a matrix from the values of the given list. 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.

Returns:

a new matrix.

make

public DoubleMatrix1D make(double[] values)

Constructs a matrix with the given cell values. 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.

make

public DoubleMatrix1D make(DoubleMatrix1D[] parts)

Constructs a matrix which is the concatenation of all given parts. Cells are copied.

make

public DoubleMatrix1D make(int size)

Constructs a matrix with the given shape, each cell initialized with zero.

make

public DoubleMatrix1D make(int size,
                  double initialValue)

Constructs a matrix with the given shape, each cell initialized with the given value.

random

public DoubleMatrix1D random(int size)

Constructs a matrix with uniformly distributed values in (0,1) (exclusive).

repeat

public DoubleMatrix1D repeat(DoubleMatrix1D A,
                    int repeat)

C = A||A||..||A; Constructs a new matrix which is concatenated repeat times. Example:

         0 1
         repeat(3) -->
         0 1 0 1 0 1
 
 

sample

public DoubleMatrix1D sample(int size,
                    double value,
                    double nonZeroFraction)

Constructs a randomly sampled matrix with the given shape. Randomly picks exactly Math.round(size*nonZeroFraction) cells and initializes them to value, all the rest will be initialized to zero. Note that this is not the same as setting each cell with probability nonZeroFraction to value.

Throws:

IllegalArgumentException - if nonZeroFraction < 0 || nonZeroFraction > 1.

See Also:

DoubleRandomSampler

toList

public DoubleArrayList toList(DoubleMatrix1D values)

Constructs a list from the given matrix. The values are copied. So subsequent changes in values are not reflected in the list, and vice-versa.

Parameters:

values - The values to be filled into the new list.

Returns:

a new list.