Eclipse Wiki Weblog

Thursday October 23, 2008

Started support for Cream in MathEclipse

Thanks to Filippo Carone it's now possible to add new functions to MathEclipse through the Eclipse plugin mechanism.

To test the plugin mechanism, I added a simple example plugin to CVS which uses the CREAM library:

• http://bach.istc.kobe-u.ac.jp/cream/

A function call like:

  Cream[{x>=0,y>=0,x+y==7,2*x+4*y==20},{x,y}] 

should give:

  {x->4,y->3}

An external Eclipse plugin must add a dependency on org.matheclipse.eval and then add this extension point in the plugin.xml

   <extension
         point="org.matheclipse.eval.namespace">
      <stringNamespace
            package="org.matheclipse.cream.functions"></stringNamespace>
   </extension>

where the Java package (org.matheclipse.cream.functions) is the place where new MathEclipse functions must be implemented:

package org.matheclipse.cream.functions;
...
public class Cream implements IFunctionEvaluator {

  public Cream() {
  }

  public IExpr evaluate(final IAST function) {
    ...
  }

  public IExpr numericEval(final IAST function) {
   // called in numeric mode
   return evaluate(function);
  }

  public void setUp(final ISymbol symbol) {
  }

}

It' also important to export the package in the /org.matheclipse.cream/META-INF/MANIFEST.MF:

 ...
 Export-Package: org.matheclipse.cream.functions

See the CVS here:

• http://matheclipse.cvs.sourceforge.net/viewvc/matheclipse/org.matheclipse.cream/

Like this post? tag it digg it add to dzone simpy this technorati slashdot