public Node differentiate(
ASTFunNode node, String var, Node[] children, Node[] dchildren, DJep djep)
throws ParseException {
OperatorSet opset = djep.getOperatorSet();
NodeFactory nf = djep.getNodeFactory();
Operator op = opset.getMultiply();
if (mulOp != null) op = mulOp;
int nchild = node.jjtGetNumChildren();
if (nchild == 2)
return nf.buildOperatorNode(
opset.getAdd(),
nf.buildOperatorNode(op, dchildren[0], djep.deepCopy(children[1])),
nf.buildOperatorNode(op, djep.deepCopy(children[0]), dchildren[1]));
Node sums[] = new Node[nchild];
for (int i = 0; i < nchild; ++i) {
Node terms[] = new Node[nchild];
for (int j = 0; j < nchild; ++j) terms[j] = children[j];
terms[i] = dchildren[i];
sums[i] = nf.buildOperatorNode(op, terms);
}
Node res = nf.buildOperatorNode(opset.getAdd(), sums);
return res;
// throw new ParseException("Too many children "+nchild+" for "+node+"\n");
}
