cern.colt.matrix.tfloat.FloatFactory3D Maven / Gradle / Ivy

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Parallel Colt is a multithreaded version of Colt - a library for high performance scientific computing in Java. It contains efficient algorithms for data analysis, linear algebra, multi-dimensional arrays, Fourier transforms, statistics and histogramming.
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/*
Copyright (C) 1999 CERN - European Organization for Nuclear Research.
Permission to use, copy, modify, distribute and sell this software and its documentation for any purpose 
is hereby granted without fee, provided that the above copyright notice appear in all copies and 
that both that copyright notice and this permission notice appear in supporting documentation. 
CERN makes no representations about the suitability of this software for any purpose. 
It is provided "as is" without expressed or implied warranty.
 */
package cern.colt.matrix.tfloat;

import cern.colt.matrix.tfloat.impl.DenseFloatMatrix3D;
import cern.colt.matrix.tfloat.impl.SparseFloatMatrix3D;
import cern.jet.math.tfloat.FloatFunctions;

/**
 * Factory for convenient construction of 3-d matrices holding float
 * cells. Use idioms like FloatFactory3D.dense.make(4,4,4) to construct
 * dense matrices, FloatFactory3D.sparse.make(4,4,4) to construct
 * sparse matrices.
 * 
 * If the factory is used frequently it might be useful to streamline the
 * notation. For example by aliasing:
 * 
 * 
 * 
 * 
 *  *  FloatFactory3D F = FloatFactory3D.dense;
 *  F.make(4,4,4);
 *  F.descending(10,20,5);
 *  F.random(4,4,5);
 *  ...
 * 
 * 
 * 
 * 
 * @author [email protected]
 * @version 1.0, 09/24/99
 */
public class FloatFactory3D extends cern.colt.PersistentObject {
    private static final long serialVersionUID = 1L;

    /**
     * A factory producing dense matrices.
     */
    public static final FloatFactory3D dense = new FloatFactory3D();

    /**
     * A factory producing sparse matrices.
     */
    public static final FloatFactory3D sparse = new FloatFactory3D();

    /**
     * Makes this class non instantiable, but still let's others inherit from
     * it.
     */
    protected FloatFactory3D() {
    }

    /**
     * Constructs a matrix with cells having ascending values. For debugging
     * purposes.
     */
    public FloatMatrix3D ascending(int slices, int rows, int columns) {
        return descending(slices, rows, columns).assign(
                FloatFunctions.chain(FloatFunctions.neg, FloatFunctions.minus(slices * rows * columns)));
    }

    /**
     * Constructs a matrix with cells having descending values. For debugging
     * purposes.
     */
    public FloatMatrix3D descending(int slices, int rows, int columns) {
        FloatMatrix3D matrix = make(slices, rows, columns);
        int v = 0;
        for (int slice = slices; --slice >= 0;) {
            for (int row = rows; --row >= 0;) {
                for (int column = columns; --column >= 0;) {
                    matrix.setQuick(slice, row, column, v++);
                }
            }
        }
        return matrix;
    }

    /**
     * Constructs a matrix with the given cell values. values is
     * required to have the form values[slice][row][column] and have
     * exactly the same number of slices, rows and columns as the receiver.
     * 
     * The values are copied. So subsequent changes in values are not
     * reflected in the matrix, and vice-versa.
     * 
     * @param values
     *            the values to be filled into the cells.
     * @return this (for convenience only).
     * @throws IllegalArgumentException
     *             if
     *             values.length != slices() || for any 0 <= slice < slices(): values[slice].length != rows()
     *             .
     * @throws IllegalArgumentException
     *             if
     *             for any 0 <= column < columns(): values[slice][row].length != columns()
     *             .
     */
    public FloatMatrix3D make(float[][][] values) {
        if (this == sparse)
            return new SparseFloatMatrix3D(values);
        return new DenseFloatMatrix3D(values);
    }

    /**
     * Constructs a matrix with the given shape, each cell initialized with
     * zero.
     */
    public FloatMatrix3D make(int slices, int rows, int columns) {
        if (this == sparse)
            return new SparseFloatMatrix3D(slices, rows, columns);
        return new DenseFloatMatrix3D(slices, rows, columns);
    }

    /**
     * Constructs a matrix with the given shape, each cell initialized with the
     * given value.
     */
    public FloatMatrix3D make(int slices, int rows, int columns, float initialValue) {
        return make(slices, rows, columns).assign(initialValue);
    }

    /**
     * Constructs a matrix with uniformly distributed values in (0,1)
     * (exclusive).
     */
    public FloatMatrix3D random(int slices, int rows, int columns) {
        return make(slices, rows, columns).assign(cern.jet.math.tfloat.FloatFunctions.random());
    }
}