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A fast and easy to use dense and sparse matrix linear algebra library written in Java.
/*
* Copyright (c) 2009-2018, 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;
}
public void set( double a11, double a12,
double a21, double a22)
{
this.a11 = a11; this.a12 = a12;
this.a21 = a21; this.a22 = 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() {
print(MatrixIO.DEFAULT_FLOAT_FORMAT);
}
@Override
public void print( String format ) {
MatrixIO.print(System.out, this, format);
}
@Override
public T createLike() {
return (T)new DMatrix2x2();
}
@Override
public MatrixType getType() {
return MatrixType.UNSPECIFIED;
}}