public static Dictionary <string, WordPair> getTF(string str, bool all = true)
{
List <WordPair> words = WordCutTool.cut(str, CutTool.nlpir);
Dictionary <string, WordPair> res = new Dictionary <string, WordPair>();
foreach (var w in words)
{
string flag = w.Flag.ToUpper();
if (all && !flag.StartsWith("N") && !flag.StartsWith("V"))
{
continue;
}
if (flag.StartsWith("W"))
{
continue;
}
if (!res.ContainsKey(w.Word))
{
res[w.Word] = new WordPair(w); res[w.Word].Num = 1;
}
else
{
res[w.Word].Num += 1;
}
}
return(res);
}
public static Dictionary <string, WordDF> getIDF(Dictionary <string, WordDF> dfs = null, string[] files = null)
{
//string[] files = Directory.GetFiles(dataDic, "*.txt");
if (files == null || files.Length <= 0)
{
return(new Dictionary <string, WordDF>());
}
int filenum = files.Length;
if (dfs == null)
{
dfs = new Dictionary <string, WordDF>();
}
int oldfilenum = 0;
foreach (var df in dfs)
{
if (df.Value.dn > oldfilenum)
{
oldfilenum = df.Value.dn;
}
}
foreach (string file in files)
{
string filecontent = File.ReadAllText(file, TxtIOController.getEncoding2(file));
var pairs = WordCutTool.cut(filecontent, CutTool.nlpir);
Dictionary <string, WordPair> wordpairs = new Dictionary <string, WordPair>();
foreach (var p in pairs)
{
wordpairs[p.Word] = p;
}
foreach (var word in wordpairs)
{
if (word.Value.Flag.ToUpper().StartsWith("N") || word.Value.Flag.ToUpper().StartsWith("V"))
{
// 只分析名词和动词
if (!dfs.ContainsKey(word.Key))
{
dfs[word.Key] = new WordDF(word.Key, 0, 0);
}
dfs[word.Key].n += 1;
}
}
}
foreach (var key in dfs.Keys)
{
dfs[key].dn = oldfilenum + filenum;
}
return(dfs);
}
