internal virtual int cfs(double x)
{
if (x < 0)
{
return(cfs(-x));
}
int a0 = ( int )Math.floor(x);
if (x == ( double )a0)
{
return(a0);
}
int a1 = ( int )Math.floor(1.0 / (x - a0));
int z = a0 * a1 + 1;
if (Math.abs(( double )z / ( double )a1 - x) < 1.0e-6)
{
return(z);
}
return(0);
}
public override double Norm()
{
double r;
if (Math.abs(Re) > Math.abs(Im))
{
r = Im / Re;
r = Math.abs(Re) * Math.Sqrt(1 + r * r);
}
else if (Im != 0)
{
r = Re / Im;
r = Math.abs(Im) * Math.Sqrt(1 + r * r);
}
else
{
r = 0.0;
}
return(r);
}
public override int Eval(Stack st)
{
int narg = GetNarg(st);
if (narg != 4)
{
throw new ParseException("Usage: ROMBERG (exp,var,ll,ul)");
}
var exp = GetAlgebraic(st);
var v = GetVariable(st);
var ll = GetAlgebraic(st);
var ul = GetAlgebraic(st);
LambdaAlgebraic xc = new ExpandConstants();
exp = xc.SymEval(exp);
ll = xc.SymEval(ll);
ul = xc.SymEval(ul);
if (!(ll is Symbol) || !(ul is Symbol))
{
throw new ParseException("Usage: ROMBERG (exp,var,ll,ul)");
}
var rombergtol = 1.0e-4;
int rombergit = 11;
var a1 = Session.Proc.Store.GetNum("rombergit");
if (a1 != null)
{
rombergit = a1.ToInt();
}
a1 = Session.Proc.Store.GetNum("rombergtol");
if (a1 != null)
{
rombergtol = a1.ToComplex().Re;
}
var a = (( Symbol )ll).ToComplex().Re;
var b = (( Symbol )ul).ToComplex().Re;
var I = Matrix.CreateRectangularArray <double>(rombergit, rombergit);
int i = 0, n = 1;
var t = trapez(exp, v, n, a, b);
if (!(t is Symbol))
{
throw new ParseException("Expression must evaluate to number");
}
I[0][0] = (( Symbol )t).ToComplex().Re;
double epsa = 1.1 * rombergtol;
while (epsa > rombergtol && i < rombergit - 1)
{
i++;
n *= 2;
t = trapez(exp, v, n, a, b);
I[0][i] = (( Symbol )t).ToComplex().Re;
double f = 1.0;
for (int k = 1; k <= i; k++)
{
f *= 4;
I[k][i] = I[k - 1][i] + (I[k - 1][i] - I[k - 1][i - 1]) / (f - 1.0);
}
epsa = Math.abs((I[i][i] - I[i - 1][i - 1]) / I[i][i]);
}
st.Push(new Complex(I[i][i]));
return(0);
}
protected internal static Symbol readNumber(StringBuilder s)
{
int kmax = 0;
while (kmax < s.Length && oneof(s[kmax], "0123456789.eE+-"))
{
kmax++;
}
var sub = s.ToString().Substring(0, kmax);
var cultureInfo = new CultureInfo("")
{
NumberFormat = { NumberDecimalSeparator = "." }
};
for (int k = kmax; k > 0; k--)
{
try
{
var ts = sub.Substring(0, k);
var x = double.Parse(ts, cultureInfo);
if (ts.EndsWith(".", StringComparison.Ordinal) && s.Length > k && (s[k] == '^' || s[k] == '/'))
{
continue;
}
bool imag = false;
if (s.Length > k && (s[k] == 'i' || s[k] == 'j'))
{
imag = true;
k++;
}
s.Remove(0, k);
if (Math.abs(x) > 1e15)
{
try
{
var bi = new BigInteger(ts, 10);
return(imag ? ( Symbol )(new Number(bi) * Symbol.IONE) : new Number(bi));
}
catch (Exception)
{
}
}
return(imag ? new Complex(0, x) : new Complex(x));
}
catch (Exception)
{
}
}
throw new ParseException("Internal Error.");
}
