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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.physics;
import JSci.GlobalSettings;
import JSci.physics.relativity.*;
/**
* The RelativisticParticle class provides an object for
* encapsulating relativistic particles.
* @version 1.0
* @author Mark Hale
*/
public abstract class RelativisticParticle extends Particle {
/**
* Constructs a relativistic particle.
*/
public RelativisticParticle() {}
/**
* Rest mass.
*/
public abstract double restMass();
/**
* Position 4-vector.
*/
public Rank1Tensor position=new Rank1Tensor(0.0,0.0,0.0,0.0);
/**
* Momentum 4-vector.
*/
public Rank1Tensor momentum=new Rank1Tensor(0.0,0.0,0.0,0.0);
/**
* Compares two particles for equality.
* @param p a relativistic particle
*/
public boolean equals(Object p) {
return (p!=null) && (p instanceof RelativisticParticle) &&
(position.equals(((RelativisticParticle)p).position)) &&
(momentum.equals(((RelativisticParticle)p).momentum)) &&
(Math.abs(restMass()-((RelativisticParticle)p).restMass())<=GlobalSettings.ZERO_TOL);
}
public int hashCode() {
return (int) restMass();
}
}