/**
* differentiate the expression and simplify
*
* @param var variable used for differentiation
*/
public void diff(String var) {
String name = proxy.getName();
DJep j = new DJep();
j.addStandardConstants();
j.addStandardFunctions();
j.addComplex();
j.setAllowUndeclared(true);
j.setAllowAssignment(true);
j.setImplicitMul(true);
// Sets up standard rules for differentiating sin(x) etc.
j.addStandardDiffRules();
try {
// parse the string
node = j.parse(name);
diff = j.differentiate(node, var);
simp = j.simplify(diff);
} catch (ParseException e) {
ErrorMessage("Error in parsing " + name);
}
}
