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JSci is a set of open source Java packages. The aim is to encapsulate scientific methods/principles in the most natural way possible. As such they should greatly aid the development of scientific based software.
It offers: abstract math interfaces, linear algebra (support for various matrix and vector types), statistics (including probability distributions), wavelets, newtonian mechanics, chart/graph components (AWT and Swing), MathML DOM implementation, ...
Note: some packages, like javax.comm, for the astro and instruments package aren't listed as dependencies (not available).
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package JSci.util;
import JSci.maths.Complex;
import JSci.maths.matrices.*;
/**
* This is a useful collection of matrix related methods.
* @author Mark Hale
*/
public final class MatrixToolkit {
private MatrixToolkit() {}
/**
* Creates a random generated square matrix.
*/
public static DoubleSquareMatrix randomSquareMatrix(int size) {
return (DoubleSquareMatrix)new DoubleSquareMatrix(size).mapElements(RandomMap.MAP);
}
/**
* Creates a random generated tridiagonal matrix.
*/
public static DoubleTridiagonalMatrix randomTridiagonalMatrix(int size) {
return new DoubleTridiagonalMatrix(toArray(randomSquareMatrix(size)));
}
/**
* Creates a random generated diagonal matrix.
*/
public static DoubleDiagonalMatrix randomDiagonalMatrix(int size) {
return new DoubleDiagonalMatrix(toArray(randomSquareMatrix(size)));
}
/**
* Creates a random generated square matrix.
*/
public static ComplexSquareMatrix randomComplexSquareMatrix(int size) {
return (ComplexSquareMatrix)new ComplexSquareMatrix(size).mapElements(RandomMap.MAP);
}
/**
* Creates a random generated tridiagonal matrix.
*/
public static ComplexTridiagonalMatrix randomComplexTridiagonalMatrix(int size) {
return new ComplexTridiagonalMatrix(toArray(randomComplexSquareMatrix(size)));
}
/**
* Creates a random generated diagonal matrix.
*/
public static ComplexDiagonalMatrix randomComplexDiagonalMatrix(int size) {
return new ComplexDiagonalMatrix(toArray(randomComplexSquareMatrix(size)));
}
/**
* Converts a matrix to an array.
*/
public static double[][] toArray(AbstractDoubleMatrix v) {
double array[][]=new double[v.rows()][v.columns()];
for(int j,i=0;i