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A fast and easy to use dense matrix linear algebra library written in Java.
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/*
 * Copyright (c) 2009-2013, Peter Abeles. All Rights Reserved.
 *
 * This file is part of Efficient Java Matrix Library (EJML).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.ejml.data;

import org.ejml.ops.MatrixIO;

/**
 * Fixed sized vector with 3 elements.  Can represent a a 3 x 1 or 1 x 3 matrix, context dependent.
 *
 * @author Peter Abeles
 */
public class FixedMatrix3_64F implements FixedMatrix64F {
    public double a1,a2,a3;

    public FixedMatrix3_64F() {
    }

    public FixedMatrix3_64F(double a1,double a2,double a3)
    {
        this.a1 = a1;
        this.a2 = a2;
        this.a3 = a3;
    }

    public FixedMatrix3_64F(FixedMatrix3_64F o) {
        this.a1 = o.a1;
        this.a2 = o.a2;
        this.a3 = o.a3;
    }

    @Override
    public double get(int row, int col) {
        return unsafe_get(row,col);
    }

    @Override
    public double unsafe_get(int row, int col) {
        if( row != 0 && col != 0 )
            throw new IllegalArgumentException("Row or column must be zero since this is a vector");

        int w = Math.max(row,col);

        if( w == 0 ) {
            return a1;
        } else if( w == 1 ) {
            return a2;
        } else if( w == 2 ) {
            return a3;
        } else {
            throw new IllegalArgumentException("Out of range.  "+w);
        }
    }

    @Override
    public void set(int row, int col, double val) {
        unsafe_set(row,col,val);
    }

    @Override
    public void unsafe_set(int row, int col, double val) {
        if( row != 0 && col != 0 )
            throw new IllegalArgumentException("Row or column must be zero since this is a vector");

        int w = Math.max(row,col);

        if( w == 0 ) {
            a1 = val;
        } else if( w == 1 ) {
            a2 = val;
        } else if( w == 2 ) {
            a3 = val;
        } else {
            throw new IllegalArgumentException("Out of range.  "+w);
        }
    }

    @Override
    public int getNumRows() {
        return 3;
    }

    @Override
    public int getNumCols() {
        return 1;
    }

    @Override
    public int getNumElements() {
        return 3;
    }

    @Override
    public  T copy() {
        return (T)new FixedMatrix3_64F(this);
    }

    @Override
    public void print() {
        MatrixIO.print(System.out, this);
    }
}