relax check that enforced that inpur sequences were not empty

Author: dkackman

LinqStatistics/EnumerableStatsBinCount.cs

@@ -17,9 +17,6 @@ public static int BinCountSturges<T>(this IEnumerable<T> source)
             if (source == null)
                 throw new ArgumentNullException("source");
 
-            if (!source.Any())
-                throw new InvalidOperationException("source sequence contains no elements");
-
             return (int)Math.Round(Math.Log(source.Count(), 2) + 1, 0);
         }
 
@@ -34,9 +31,6 @@ public static int BinCountSquareRoot<T>(this IEnumerable<T> source)
             if (source == null)
                 throw new ArgumentNullException("source");
 
-            if (!source.Any())
-                throw new InvalidOperationException("source sequence contains no elements");
-
             return (int)Math.Round(Math.Sqrt(source.Count()), 0);
         }
 
@@ -50,9 +44,6 @@ public static int BinCountRice<T>(this IEnumerable<T> source)
         {
             if (source == null)
                 throw new ArgumentNullException("source");
-
-            if (!source.Any())
-                throw new InvalidOperationException("source sequence contains no elements");
 
             return (int)Math.Round(2.0 * Math.Pow(source.Count(), 1.0 / 3.0), 0);
         }

LinqStatistics/EnumerableStatsCountEach.cs

@@ -21,9 +21,6 @@ public static IEnumerable<ItemCount<T>> CountEach<T>(this IEnumerable<T> source,
             if (comparer == null)
                 throw new ArgumentNullException("comparer");
 
-            if (!source.Any())
-                throw new InvalidOperationException("source sequence contains no elements");
-
             return source.GroupBy(t => t, comparer).OrderBy(g => g.Key).Select(g => new ItemCount<T>(g.Key, g.Count()));
         }
 

LinqStatistics/EnumerableStatsKurtosis.cs

@@ -467,23 +467,4 @@ public static double Kurtosis<TSource>(this IEnumerable<TSource> source, Func<TS
             return source.Select(selector).Kurtosis();
         }
      }
-}
-// a single pass implementation 
-            //double M1 = 0, M2 = 0, M3 = 0, M4 = 0;
-
-            //int n = 0;
-            //foreach (var x in source)
-            //{
-            //    int n1 = n;
-            //    n++;
-            //    double delta = x - M1;
-            //    double delta_n = delta / n;
-            //    double delta_n2 = delta_n * delta_n;
-            //    double term1 = delta * delta_n * n1;
-            //    M1 += delta_n;
-            //    M4 += term1 * delta_n2 * (n * n - 3 * n + 3) + 6 * delta_n2 * M2 - 4 * delta_n * M3;
-            //    M3 += term1 * delta_n * (n - 2) - 3 * delta_n * M2;
-            //    M2 += term1;
-            //}
-
-            //return n * M4 / (M2 * M2) - 3.0;
+}

LinqStatistics/EnumerableStatsKurtosis.tt

@@ -120,23 +120,4 @@ namespace LinqStatistics
         }
  <# } #>
     }
-}
-// a single pass implementation 
-            //double M1 = 0, M2 = 0, M3 = 0, M4 = 0;
-
-            //int n = 0;
-            //foreach (var x in source)
-            //{
-            //    int n1 = n;
-            //    n++;
-            //    double delta = x - M1;
-            //    double delta_n = delta / n;
-            //    double delta_n2 = delta_n * delta_n;
-            //    double term1 = delta * delta_n * n1;
-            //    M1 += delta_n;
-            //    M4 += term1 * delta_n2 * (n * n - 3 * n + 3) + 6 * delta_n2 * M2 - 4 * delta_n * M3;
-            //    M3 += term1 * delta_n * (n - 2) - 3 * delta_n * M2;
-            //    M2 += term1;
-            //}
-
-            //return n * M4 / (M2 * M2) - 3.0;
+}

LinqStatistics/Range.cs

@@ -195,10 +195,10 @@ public override int GetHashCode()
         }
 
         /// <summary>
-        /// Returns the fully qualified type name of this instance.
+        /// Returns a string representation of the range
         /// </summary>
         /// <returns>
-        /// A <see cref="T:System.String"/> containing a fully qualified type name.
+        /// A <see cref="T:System.String"/> representation of the range
         /// </returns>
         public override string ToString()
         {

LinqStatisticsTests/HistogramTests.cs

@@ -10,6 +10,16 @@ namespace LinqStatistics.UnitTests
     [TestClass]
     public class HistogramTests
     {
+        [TestMethod]
+        public void CounEachEmpty()
+        {
+            var list = new List<int>();
+
+            var counts = list.CountEach();
+
+            Assert.IsFalse(counts.Any());
+        }
+
         [TestMethod]
         public void CounEachIntegers()
         {