public Complex RealAbs()
{
if (!Imag.IsZero)
{
throw new InvalidOperationException();
}
return(new Complex(Real.Abs(), Imag, IsExact));
}
public static string ToString(Expression Value, Units Units, string format, IFormatProvider formatProvider)
{
StringBuilder SB = new StringBuilder();
Constant constant = Value as Constant;
if (constant != null)
{
if (format != null && format.StartsWith("+"))
{
if (constant.Value >= 0)
{
SB.Append("+");
}
format = format.Remove(0, 1);
}
// Find out how many digits the format has.
double round = 1.0;
for (int significant = 12; significant > 0; --significant)
{
round = 1.0 + 5 * Math.Pow(10.0, -significant);
if (double.Parse(round.ToString(format)) != 1.0)
{
break;
}
}
// Find the order of magnitude of the value.
Real order = Real.Log10(Real.Abs(constant.Value.IsNaN() ? 0 : constant.Value) * round);
if (order < -20)
{
order = 0;
}
else if (order == Real.Infinity)
{
order = 0;
}
int prefix = Math.Max(Math.Min((int)Real.Floor(order / 3) * 3, MaxPrefix), MinPrefix);
Value = Value / (((Real)10) ^ prefix);
SB.Append(((IFormattable)Value).ToString(format, formatProvider));
SB.Append(" ");
SB.Append(Prefixes.Single(i => i.Value == prefix).Key);
}
else if (Value != null)
{
SB.Append(Value.ToString());
SB.Append(" ");
}
else
{
SB.Append("0");
SB.Append(" ");
}
SB.Append(Units);
return(SB.ToString().Trim());
}
