/*
GeoGebra - Dynamic Mathematics for Everyone
http://www.geogebra.org
This file is part of GeoGebra.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation.
*/
package org.geogebra.common.kernel.advanced;
import org.geogebra.common.kernel.Construction;
import org.geogebra.common.kernel.algos.AlgoElement;
import org.geogebra.common.kernel.commands.Commands;
import org.geogebra.common.kernel.geos.GeoElement;
import org.geogebra.common.kernel.geos.GeoList;
import org.geogebra.common.kernel.geos.GeoNumeric;
import org.geogebra.common.util.GgbMat;
/**
* Reverse a list. Adapted from AlgoSort
*
* @author Michael Borcherds
* @version 16-02-2008
*/
public class AlgoDeterminant extends AlgoElement {
private GeoList inputList; // input
private GeoNumeric num; // output
public AlgoDeterminant(Construction cons, String label, GeoList inputList) {
super(cons);
this.inputList = inputList;
num = new GeoNumeric(cons);
setInputOutput();
compute();
num.setLabel(label);
}
@Override
public Commands getClassName() {
return Commands.Determinant;
}
@Override
protected void setInputOutput() {
input = new GeoElement[1];
input[0] = inputList;
super.setOutputLength(1);
super.setOutput(0, num);
setDependencies(); // done by AlgoElement
}
public GeoNumeric getResult() {
return num;
}
@Override
public final void compute() {
GgbMat matrix = new GgbMat(inputList);
if (matrix.isUndefined() || !matrix.isSquare()) {
num.setUndefined();
return;
}
double det = matrix.determinant();
if (matrix.hasOnlyIntegers()) {
det = Math.round(det);
}
num.setValue(det);
// Determinant[{{1,2},{3,4}}]
}
}