doublegrid3d.java

MASON代表多主体邻里或网络仿真(Multi-Agent Simulator of Neighborhoods or Networks)。它是乔治梅森大学用Java开发的离散事件多主体仿真核心库

package sim.field.grid;

import sim.util.*;

/**
   A wrapper for 3D arrays of doubles.

   <p>This object expects that the 3D arrays are rectangular.  You are encouraged to access the array
   directly.  The object
   implements all of the Grid3D interface.  See Grid3D for rules on how to properly implement toroidal
   grids.
    
   <p>The width and height and length (z dimension) of the object are provided to avoid having to say field[x].length, etc.  
*/

public /*strictfp*/ class DoubleGrid3D extends AbstractGrid3D
    {
    public double[/**x*/][/**y*/][/**z*/] field;
    
    public DoubleGrid3D (int width, int height, int length)
        {
        this.width = width;
        this.height = height;
        this.length = length;
        field = new double[width][height][length];
        }
    
    public DoubleGrid3D (int width, int height, int length, double initialValue)
        {
        this(width,height,length);
        setTo(initialValue);
        }
    
    public DoubleGrid3D (DoubleGrid3D values)
        {
        super();
        setTo(values);
        }

    /** Sets location (x,y,z) to val */
    public final double set(final int x, final int y, final int z, final double val)
        {
        double returnval = field[x][y][z];
        field[x][y][z] = val;
        return returnval;
        }
    
    /** Returns the element at location (x,y,z) */
    public final double get(final int x, final int y, final int z)
        {
        return field[x][y][z];
        }


    /** Returns the maximum value stored in the grid */
    public final double max()
        {
        double max = Double.NEGATIVE_INFINITY;
        double[][] fieldx = null;
        double[] fieldxy = null;
        final int width = this.width;
        final int height = this.height;
        final int length = this.length;         
        for(int x=0;x<width;x++)
            {
            fieldx = field[x];
            for(int y=0;y<height;y++)
                {
                fieldxy= fieldx[y];
                for(int z=0;z<length;z++)
                    if (max < fieldxy[z]) max = fieldxy[z];
                }
            }
        return max;
        }

    /** Returns the minimum value stored in the grid */
    public final double min()
        {
        double min = Double.POSITIVE_INFINITY;
        double[][] fieldx = null;
        double[] fieldxy = null;
        final int width = this.width;
        final int height = this.height;
        final int length = this.length;         
        for(int x=0;x<width;x++)
            {
            fieldx = field[x];
            for(int y=0;y<height;y++)
                {
                fieldxy = fieldx[y];
                for(int z=0;z<length;z++)
                    if (min > fieldxy[z]) min = fieldxy[z];
                }
            }
        return min;
        }
        
    /** Returns the mean value stored in the grid */
    public final double mean()
        {
        long count = 0;
        double mean = 0;
        double[][] fieldx = null;
        double[] fieldxy = null;        
        final int width = this.width;
        final int height = this.height;
        final int length = this.length;         
        for(int x=0;x<width;x++)
            {
            fieldx = field[x];
            for(int y=0;y<height;y++)
                {
                fieldxy = fieldx[y];
                for(int z=0;z<length;z++)
                    { mean += fieldxy[z]; count++; }
                }
            }
        return (count == 0 ? 0 : mean / count);
        }
        
    /** Sets all the locations in the grid the provided element */
    public final DoubleGrid3D setTo(double thisMuch)
        {
        double[][] fieldx = null;
        double[] fieldxy = null;        
        final int width = this.width;
        final int height = this.height;
        final int length = this.length;         
        for(int x=0;x<width;x++)
            {
            fieldx = field[x];
            for(int y=0;y<height;y++)
                {
                fieldxy = fieldx[y];
                for(int z=0;z<length;z++)
                    fieldxy[z]=thisMuch;
                }
            }
        return this;
        }

    /** Changes the dimensions of the grid to be the same as the one provided, then
        sets all the locations in the grid to the elements at the quivalent locations in the
        provided grid. */
    public final DoubleGrid3D setTo(DoubleGrid3D values)
        {
        if (width != values.width || height != values.height || length != values.length )
            {
            final int width = this.width = values.width;
            final int height = this.height = values.height;
            final int length = this.length = values.length;
            field = new double[width][height][];
            double[][] fieldx = null;
            for(int x = 0 ; x < width; x++)
                {
                fieldx = field[x];
                for( int y = 0 ; y < height ; y++ )
                    fieldx[y] = (double []) (values.field[x][y].clone());
                }
            }
        else
            {
            for(int x =0 ; x < width; x++)
                for( int y = 0 ; y < height ; y++ )
                    System.arraycopy(values.field[x][y],0,field[x][y],0,length);
            }

        return this;
        }

    /** Thresholds the grid so that values greater to <i>toNoMoreThanThisMuch</i> are changed to <i>toNoMoreThanThisMuch</i>.
        Returns the modified grid. 
    */
    public final DoubleGrid3D upperBound(double toNoMoreThanThisMuch)
        {
        double[][] fieldx = null;
        double[] fieldxy = null;     
        final int width = this.width;
        final int height = this.height;
        final int length = this.length;         
           
        for(int x=0;x<width;x++)
            {
            fieldx = field[x];
            for(int y=0;y<height;y++)
                {
                fieldxy = fieldx[y];
                for(int z=0;z<length;z++)
                    if (fieldxy[z] > toNoMoreThanThisMuch)
                        fieldxy[z] = toNoMoreThanThisMuch;
                }
            }
        return this;
        }

    /** Thresholds the grid so that values smaller than <i>toNoLowerThanThisMuch</i> are changed to <i>toNoLowerThanThisMuch</i>
        Returns the modified grid. 
    */
    public final DoubleGrid3D lowerBound(double toNoLowerThanThisMuch)
        {
        double[][] fieldx = null;
        double[] fieldxy = null;                        
        final int width = this.width;
        final int height = this.height;
        final int length = this.length;         
        for(int x=0;x<width;x++)
            {
            fieldx = field[x];
            for(int y=0;y<height;y++)
                {
                fieldxy = fieldx[y];
                for(int z=0;z<length;z++)
                    if (field[x][y][z] < toNoLowerThanThisMuch)
                        field[x][y][z] = toNoLowerThanThisMuch;
                }
            }
        return this;
        }

    /** Sets each value in the grid to that value added to <i>withThisMuch</i>
        Returns the modified grid. 
    */
    public final DoubleGrid3D add(double withThisMuch)
        {
        if (withThisMuch==0.0) return this;
        double[][] fieldx = null;
        double[] fieldxy = null;        
        final int width = this.width;
        final int height = this.height;
        final int length = this.length;         

        for(int x=0;x<width;x++)
            {
            fieldx = field[x];
            for(int y=0;y<height;y++)
                {
                fieldxy = fieldx[y];
                for(int z=0;z<length;z++)
                    fieldxy[z]+=withThisMuch;
                }
            }
        return this;
        }
        
    /** Sets the value at each location in the grid to that value added to the value at the equivalent location in the provided grid.
        Returns the modified grid. 
    */
    public final DoubleGrid3D add(IntGrid3D withThis)
        {
        int[][][] otherField = withThis.field;
        int[][] ofieldx = null;
        int[] ofieldxy = null;        
        double[][] fieldx = null;
        double[] fieldxy = null;        
        final int width = this.width;
        final int height = this.height;
        final int length = this.length;         
        
        for(int x=0;x<width;x++)
            {
            fieldx = field[x];
            ofieldx = otherField[x];
            for(int y=0;y<height;y++)
                {
                ofieldxy = ofieldx[y];
                fieldxy = fieldx[y];
                for(int z=0;z<length;z++)
                    fieldxy[z]+=ofieldxy[z];
                }
            }
        return this;