Changeset 8564

Timestamp:

09/04/12 11:24:29 (12 years ago)

Author:

gkronber

Message:

#1890

• added an extension to calculate the range of IEnumerable<double>
• increased the buffer size for the heuristic determination of separator characters in the table file parser (to make it work with files that have more than 1024 bytes in the second line).

Location:

trunk/sources

Files:

• HeuristicLab.Common/3.3/EnumerableStatisticExtensions.cs (modified) (1 diff)
• HeuristicLab.Problems.Instances.DataAnalysis/3.3/TableFileParser.cs (modified) (1 diff)

trunk/sources/HeuristicLab.Common/3.3/EnumerableStatisticExtensions.cs

@@ -45 +45 @@
         return (valuesArr[(n / 2) - 1] + valuesArr[n / 2]) / 2.0;
       }
+    }
+
+    /// <summary>
+    /// Calculates the range (max - min) of the enumeration.
+    /// </summary>
+    /// <param name="values"></param>
+    /// <returns></returns>
+    public static double Range(this IEnumerable<double> values) {
+      double min = double.PositiveInfinity;
+      double max = double.NegativeInfinity;
+      int i = 0;
+      foreach (var e in values) {
+        if (min > e) min = e;
+        if (max < e) max = e;
+        i++;
+      }
+      if (i <= 2) throw new ArgumentException("The enumerable must contain at least two elements", "values");
+      return max - min;
     }
 

trunk/sources/HeuristicLab.Problems.Instances.DataAnalysis/3.3/TableFileParser.cs

@@ -32 +32 @@
 namespace HeuristicLab.Problems.Instances.DataAnalysis {
   public class TableFileParser {
-    private const int BUFFER_SIZE = 1024;
+    private const int BUFFER_SIZE = 65536;
     private static readonly char[] POSSIBLE_SEPARATORS = new char[] { ',', ';', '\t' };
     private Tokenizer tokenizer;