Changeset 13034
 Timestamp:
 10/19/15 16:17:04 (7 years ago)
 File:

 1 edited
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trunk/sources/HeuristicLab.Common/3.3/EnumerableStatisticExtensions.cs
r13033 r13034 202 202 /// </summary> 203 203 public static double Percentile(this IEnumerable<double> values, double p) { 204 // iterate only once 205 double[] valuesArr = values.ToArray(); 206 int n = valuesArr.Length; 207 if (n == 0) throw new InvalidOperationException("Enumeration contains no elements."); 208 if (n == 1) return values.ElementAt(0); 209 210 if (p.IsAlmost(0.0)) return valuesArr[0]; 211 if (p.IsAlmost(1.0)) return valuesArr[n  1]; 212 213 double t = p * (n  1); 214 int index = (int)Math.Floor(t); 215 double percentage = t  index; 216 return valuesArr[index] * (1  percentage) + valuesArr[index + 1] * percentage; 204 // percentiles are actually quantiles where alpha is constrained to integer percentage values from 1% to 99% 205 return Quantile(values, p); 217 206 } 218 207
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