/**
* Applies differentiation to a function. Used the rules specified by objects of type {@link
* DiffRulesI}.
*
* @param node The node of the function.
* @param data The variable to differentiate wrt.
*/
public Object visit(ASTFunNode node, Object data) throws ParseException {
String name = node.getName();
// System.out.println("FUN: "+ node + " nchild "+nchild);
Node children[] = TreeUtils.getChildrenAsArray(node);
Node dchildren[] = acceptChildrenAsArray(node, data);
if (node.getPFMC() instanceof DiffRulesI) {
return ((DiffRulesI) node.getPFMC())
.differentiate(node, (String) data, children, dchildren, localDJep);
}
DiffRulesI rules = (DiffRulesI) diffRules.get(name);
if (rules != null)
return rules.differentiate(node, (String) data, children, dchildren, localDJep);
throw new ParseException("Sorry I don't know how to differentiate " + node + "\n");
}
/** Prints all the differentation rules for all functions on specified stream. */
public void printDiffRules(PrintStream out) {
out.println("Standard Functions and their derivatives");
for (String key : globalDJep.getFunctionTable().functionNames()) {
PostfixMathCommandI value = globalDJep.getFunctionTable().get(key);
DiffRulesI rule = (DiffRulesI) diffRules.get(key);
if (rule == null)
out.print(
key + " No diff rules specified (" + value.getNumberOfParameters() + " arguments).");
else out.print(rule.toString());
out.println();
}
for (Enumeration en = diffRules.keys(); en.hasMoreElements(); ) {
String key = (String) en.nextElement();
DiffRulesI rule = (DiffRulesI) diffRules.get(key);
if (!globalDJep.getFunctionTable().contains(key)) {
out.print(rule.toString());
out.println("\tnot in JEP function list");
}
}
}
/** Adds the rules for a given function. */
void addDiffRule(DiffRulesI rule) {
diffRules.put(rule.getName(), rule);
if (DEBUG) System.out.println("Adding rule for " + rule.getName());
}