Java Array Permute permuteVector(float[] indexVector, int rotation)

Description

permute Vector

License

Open Source License

Parameter

Parameter	Description
indexVector	a parameter
rotation	a parameter

Declaration

public static float[] permuteVector(float[] indexVector, int rotation) 

Method Source Code

//package com.java2s;
/**/*from   www . j av  a  2s  .c  om*/
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   GNU GENERAL PUBLIC LICENSE - Version 3, 29 June 2007
 **/

public class Main {
    /**
     *
     * @param indexVector
     * @param rotation
     * @return
     */
    public static float[] permuteVector(float[] indexVector, int rotation) {
        // Correct for unlikely possibility that rotation specified > indexVector.length
        if (Math.abs(rotation) > indexVector.length) {
            rotation = rotation % indexVector.length;
        }
        float[] permutedVector = new float[indexVector.length];
        int max = indexVector.length;

        for (int x = 0; x < max; x++) {
            int newIndex = x + rotation;
            if (newIndex >= max) {
                newIndex = newIndex - max;
            }
            if (newIndex < 0) {
                newIndex = max + newIndex;
            }
            permutedVector[newIndex] = indexVector[x];
        }

        return permutedVector;
    }

    /**
     *
     * @param indexVector
     * @param rotation
     * @param dimension
     * @return
     */
    public static short[] permuteVector(short[] indexVector, int rotation, int dimension) {
        short[] permutedVector = new short[indexVector.length];
        for (int x = 0; x < permutedVector.length; x++) {
            int newIndex = Math.abs(indexVector[x]);
            int sign = Integer.signum(indexVector[x]);
            // rotate vector
            newIndex += rotation;
            if (newIndex > dimension) {
                newIndex = newIndex - dimension;
            }
            if (newIndex < 1) {
                newIndex = dimension + newIndex;
            }
            newIndex = newIndex * sign;
            permutedVector[x] = (short) newIndex;
        }
        return permutedVector;
    }
}

Related

1. permute(T[] values)
2. permuteArray(int[] array, Integer[] permutation)
3. permuteCols(double[][] ary, int[] idx)
4. permuteList(List inList)
5. permuteRows(double[][] ary, int[] idx)