/**
* Pops a value off the stack and returns its hyperbolic cosecant.
* @param evaluator The current evaluation.
* @return The hyperbolic cosecant of the popped node.
*/
double HyperbolicCosecantNode::evaluate(Evaluator& evaluator) const
{
double arg = evaluator.pop();
double ex = exp(arg);
return (2 * ex) / (ex * ex - 1);
}
/**
* Pops two values off the stack and returns the first raised to the power of the reciprocal of the second.
* @param evaluator The current evaluation.
* @return The second value'th root of the first popped value.
*/
double RootNode::evaluate(Evaluator& evaluator) const
{
double arg2 = evaluator.pop();
double arg1 = evaluator.pop();
return pow(arg1, 1.0 / arg2);
}
/**
* Pops a value off the stack and returns its hyperbolic tangent.
* @param evaluator The current evaluation.
* @return The hyperbolic tangent of the popped node.
*/
double HyperbolicTangentNode::evaluate(Evaluator& evaluator) const
{
double arg = evaluator.pop();
double ex = exp(2 * arg);
return (ex - 1) / (ex + 1);
}
/**
* Pops a value off the stack and returns its hyperbolic sine.
* @param evaluator The current evaluation.
* @return The hyperbolic sine of the popped node.
*/
double HyperbolicSineNode::evaluate(Evaluator& evaluator) const
{
double arg = evaluator.pop();
double ex = exp(arg);
return (ex * ex - 1) / (2 * ex);
}
/**
* Pops a value off the stack and returns its decadic logarithm.
* @param evaluator The current evaluation.
* @return The decadic logarithm of the popped value.
*/
double DecadicLogarithmNode::evaluate(Evaluator& evaluator) const
{
double arg = evaluator.pop();
return log10(arg);
}
/**
* Pops a value off the stack and returns its hyperbolic arc cosecant.
* @param evaluator The current evaluation.
* @return The hyperbolic arc cosecant of the popped node.
*/
double HyperbolicArcCosecantNode::evaluate(Evaluator& evaluator) const
{
double arg = evaluator.pop();
double inv = 1.0 / arg;
return log(inv + sqrt(inv * inv + 1));
}
/**
* Pops a value off the stack and returns its absolute value.
* @param evaluator The current evaluation.
* @return The absolute value of the popped node.
*/
double AbsoluteValueNode::evaluate(Evaluator& evaluator) const
{
double arg = evaluator.pop();
return fabs(arg);
}
