private static BigNum EvaluateFunction(Function function, BigNum num)
{
switch (function)
{
case Function.Sin: return(BigMath.Sin(num));
case Function.Cos: return(BigMath.Cos(num));
case Function.Tan: return(BigMath.Tan(num));
case Function.Csc: return(BigMath.Csc(num));
case Function.Sec: return(BigMath.Sec(num));
case Function.Cot: return(BigMath.Cot(num));
case Function.Abs: return(BigMath.Abs(num));
case Function.Ceil: return(BigMath.Ceiling(num));
case Function.Floor: return(BigMath.Floor(num));
case Function.Fact: return(BigMath.Gamma(num));
default:
throw new ExpressionException("Unknown or invalid function");
}
}
private static BigNum Modulo(BigNum x, BigNum y)
{
// a % b == a - ( b * Floor[a / b] )
if (y == 0)
{
throw new DivideByZeroException("Divisor y cannot be zero");
}
if (x.IsZero)
{
return(new BigFloat(0));
}
BigNum floored = BigMath.Floor(x / y);
BigNum multbyb = y * floored;
BigNum retval = x - multbyb;
return(retval);
}