/** Implements <i>(exp(f(x)))' = exp(f(x)) * f'(x)</i>. */
public OpNode getDerivative(String variable) {
if (getMaxAbsPowerOfVariable(variable) == 0) return new NumberOp(m_numberClass, 0);
OpNode unchangedExpOp = new ExpOp(m_numberClass);
OpNode derivedChild = m_children[0].getDerivative(variable);
unchangedExpOp.setChildren(new OpNode[] {(OpNode) m_children[0].clone()});
MultOp derivedExpOp = new MultOp(m_numberClass);
derivedExpOp.setChildren(new OpNode[] {unchangedExpOp, derivedChild});
return deriveNode(derivedExpOp);
}
public RelNode getNodeDefinedRel(OpNode operand) {
return new AndRel(
new RelNode[] {
new SimpleRel(new Operation((OpNode) operand.clone()), "-1", Relation.GREATER_OR_EQUAL),
new SimpleRel(new Operation((OpNode) operand.clone()), "1", Relation.LESS_OR_EQUAL)
});
}
public RelNode getZeroRel(OpNode operand) {
return new SimpleRel(new Operation((OpNode) operand.clone()), Relation.EQUAL);
}
public RelNode getZeroRel(OpNode operand) {
return operand.getZeroRel();
}
public RelNode getMonotonicIncreasingRel(OpNode operand) {
return operand.getMonotonicIncreasingRel();
}
