/// <summary>
/// Returns the <see cref="T:System.Double" /> negative binomial distribution.
/// </summary>
/// <param name="args"><para>
/// The args contains 3 items: number_f, number_s, probability_s.
/// </para>
/// <para>
/// Number_f is the number of failures.
/// </para>
/// <para>
/// Number_s is the threshold number of successes.
/// </para>
/// <para>
/// Probability_s is the probability of a success.
/// </para></param>
/// <returns>
/// A <see cref="T:System.Double" /> value that indicates the evaluate result.
/// </returns>
public override object Evaluate(object[] args)
{
int num;
int num2;
double num3;
base.CheckArgumentsLength(args);
if (!CalcConvert.TryToInt(args[0], out num) || !CalcConvert.TryToInt(args[1], out num2))
{
return(CalcErrors.Value);
}
if (!CalcConvert.TryToDouble(args[2], out num3, true))
{
return(CalcErrors.Value);
}
if ((num3 < 0.0) || (num3 >= 1.0))
{
return(CalcErrors.Number);
}
if (((num + num2) - 1) <= 0)
{
return(CalcErrors.Number);
}
object obj2 = new CalcCombinFunction().Evaluate(new object[] { (int)((num + num2) - 1), (int)(num2 - 1) });
if (obj2 is CalcError)
{
return(obj2);
}
double num4 = (double)((double)obj2);
double num5 = Math.Pow(num3, (double)num2);
double num6 = Math.Pow(1.0 - num3, (double)num);
return(CalcConvert.ToResult((num4 * num5) * num6));
}
/// <summary>
/// Returns the <see cref="T:System.Double" /> hyper geometric distribution for a finite population.
/// </summary>
/// <param name="args"><para>
/// The args contains 4 items: sample_s, number_sample, population_s, number_population.
/// </para>
/// <para>
/// Sample_s is the number of successes in the sample.
/// </para>
/// <para>
/// Number_sample is the size of the sample.
/// </para>
/// <para>
/// Population_s is the number of successes in the population.
/// </para>
/// <para>
/// Number_population is the population size.
/// </para></param>
/// <returns>
/// A <see cref="T:System.Double" /> value that indicates the evaluate result.
/// </returns>
public override object Evaluate(object[] args)
{
base.CheckArgumentsLength(args);
int num = CalcConvert.ToInt(args[0]);
int num2 = CalcConvert.ToInt(args[1]);
int num3 = CalcConvert.ToInt(args[2]);
int num4 = CalcConvert.ToInt(args[3]);
if ((num < 0.0) || (num > Math.Min(num2, num3)))
{
return(CalcErrors.Number);
}
if (num < Math.Max((double)0.0, (double)((num2 - num4) + num3)))
{
return(CalcErrors.Number);
}
if ((num2 < 0.0) || (num2 > num4))
{
return(CalcErrors.Number);
}
if ((num3 < 0.0) || (num3 > num4))
{
return(CalcErrors.Number);
}
if (num4 < 0.0)
{
return(CalcErrors.Number);
}
CalcBuiltinFunction function = new CalcCombinFunction();
object obj2 = function.Evaluate(new object[] { (int)num3, (int)num });
if (obj2 is CalcError)
{
return(obj2);
}
double num5 = (double)((double)obj2);
obj2 = function.Evaluate(new object[] { (int)(num4 - num3), (int)(num2 - num) });
if (obj2 is CalcError)
{
return(obj2);
}
double num6 = (double)((double)obj2);
obj2 = function.Evaluate(new object[] { (int)num4, (int)num2 });
if (obj2 is CalcError)
{
return(obj2);
}
double num7 = (double)((double)obj2);
return(CalcConvert.ToResult((num5 * num6) / num7));
}
