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A fast and easy to use dense and sparse matrix linear algebra library written in Java.
There is a newer version: 0.43.1
/*
 * Copyright (c) 2009-2017, 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 2 by DMatrix2x2 matrix.  The matrix is stored as class variables for very fast read/write.  aXY is the
 * value of row = X and column = Y.
 * DO NOT MODIFY.  Automatically generated code created by GenerateMatrixFixedNxN
 *
 * @author Peter Abeles
 */
public class DMatrix2x2 implements DMatrixFixed {

    public double a11,a12;
    public double a21,a22;

    public DMatrix2x2() {
    }

    public DMatrix2x2( double a11, double a12,
                       double a21, double a22)
    {
        this.a11 = a11; this.a12 = a12;
        this.a21 = a21; this.a22 = a22;
    }

    public DMatrix2x2( DMatrix2x2 o ) {
        this.a11 = o.a11; this.a12 = o.a12;
        this.a21 = o.a21; this.a22 = o.a22;
    }

    @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 ) {
            if( col == 0 ) {
                return a11;
            } else if( col == 1 ) {
                return a12;
            }
        } else if( row == 1 ) {
            if( col == 0 ) {
                return a21;
            } else if( col == 1 ) {
                return a22;
            }
        }
        throw new IllegalArgumentException("Row and/or column out of range. "+row+" "+col);
    }

    @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 ) {
            if( col == 0 ) {
                a11 = val; return;
            } else if( col == 1 ) {
                a12 = val; return;
            }
        } else if( row == 1 ) {
            if( col == 0 ) {
                a21 = val; return;
            } else if( col == 1 ) {
                a22 = val; return;
            }
        }
        throw new IllegalArgumentException("Row and/or column out of range. "+row+" "+col);
    }

    @Override
    public void set(Matrix original) {
        if( original.getNumCols() != 2 || original.getNumRows() != 2 )
            throw new IllegalArgumentException("Rows and/or columns do not match");
        DMatrix m = (DMatrix)original;
        
        a11 = m.get(0,0);
        a12 = m.get(0,1);
        a21 = m.get(1,0);
        a22 = m.get(1,1);
    }

    @Override
    public int getNumRows() {
        return 2;
    }

    @Override
    public int getNumCols() {
        return 2;
    }

    @Override
    public int getNumElements() {
        return 4;
    }

    @Override
    public  T copy() {
        return (T)new DMatrix2x2(this);
    }

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

    @Override
    public  T createLike() {
        return (T)new DMatrix2x2();
    }
}