@Override
public ExprTree mutateExprTree(ExprTree ptree, ExprTreeSchema schema, IRandGen randgen) {
// Copy of expr
ExprTree stree = ptree.copy();
// Node selection
int selectIndex = randgen.choose(0, ptree.size());
// Mutated node
IPrimitive oldBlock = stree.getBlock(selectIndex);
Class<?> rtype = oldBlock.returnType();
int arity = oldBlock.argumentTypes().length;
IPrimitive newBlock = schema.getAnyBlock(rtype, randgen, arity);
stree.setBlock(newBlock, selectIndex);
// Return result
return stree;
}
/** {@inheritDoc} */
public double getRandom(IRandGen randgen) {
return randgen.uniform(efLeft(), efRight());
}