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接前面一篇TF-IDF的代码,用其结果来计算出向量的余弦值的代码
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using System;
using System.Collections.Generic; using System.Text; namespace Cluster { static class Cosine { /// <summary> /// 计算向量余弦值 /// </summary> /// <param name="vector1"></param> /// <param name="vector2"></param> public static double Calculate(Dictionary<int, double> vector1, Dictionary<int, double> vector2) { double dotProduct = CalcDotProduct(vector1, vector2); double length1 = CalcLength(vector1); double length2 = CalcLength(vector2); double cosine = dotProduct / (length1 * length2); return cosine; } /// <summary> /// 计算向量长度(vector length) /// </summary> /// <param name="vector"></param> /// <returns></returns> private static double CalcLength(Dictionary<int, double> vector) { double length = 0; foreach (KeyValuePair<int, double> kvp in vector) { length += Math.Pow(kvp.Value, 2); } return Math.Sqrt(length); } /// <summary> /// 计算向量点积(dot product)/内积(inner product) /// </summary> /// <param name="vector1"></param> /// <param name="vector2"></param> /// <returns></returns> private static double CalcDotProduct(Dictionary<int, double> vector1, Dictionary<int, double> vector2) { double dotProduct = 0; foreach (KeyValuePair<int, double> kvp in vector1) { if (vector2.ContainsKey(kvp.Key)) { dotProduct += kvp.Value * vector2[kvp.Key]; } } return dotProduct; } } }
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