Effective ways to extract nouns out of a text doc

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SQL-Server-2012

hey i am currently working on a natural language project. So at first the task at had was to extract the keywords out of a text. Now dat is done and i am gonna put the codes in here. Can anyone suggest some techniques to extract the nouns out of the text by further modifying the code.

C#

namespace maxrep
{
  class Program
  {
    static void Main(string[] args)
    {
      string filename = "hello.txt";
      // string filename1 = "text.txt";
      /*
      * 
      *List<streamreader> SRL = new List<streamreader>();
      for (int i=1; i<foo.number_of_files+1;i++)>
      { 
      StreamReader aa= new StreamReader(@"realtime_" + Foo.main_id + "_" + i + ".txt");
      SRL.Add (aa);
      }
      */
      string inputString = File.ReadAllText(filename);
      // string inputStr = File.ReadAllText(filename1);

      inputString = inputString.ToLower();

      // Define characters to strip from the input and do it
      string[] stripChars = { ";", ",", ".", "-", "_", "^", "(", ")", "[", "]",
                              "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "\n", "\t", "\r" };
      foreach (string character in stripChars)
      {
        inputString = inputString.Replace(character, "");
      }

      List<string> wordList = inputString.Split(' ').ToList();

      string[] stopwords = new string[] { "and", "the", "she", "for", "this", "you", "but" };
      // string[] negative = new string[] { "bad", "worse", "low", "decrease", "fail", "reduce", "weak", "sad" };
      foreach (string word in stopwords)
      {
        while (wordList.Contains(word))
        {
          wordList.Remove(word);
        }
      }

      Dictionary<string, int> dictionary = new Dictionary<string, int>();

      foreach (string word in wordList)
      {
        if (word.Length >= 3)
        {
          if (dictionary.ContainsKey(word))
          {
            dictionary[word]++;
          }
          else
          {
            dictionary[word] = 1;
          }
        }
      }

      var sortedDict = (from entry in dictionary orderby entry.Value descending select entry).ToDictionary(pair => pair.Key, pair => pair.Value);

      int count = 1;
      Console.WriteLine("---- Most Frequent Terms in the File: " + filename + " ----");
      Console.WriteLine();
      foreach (KeyValuePair<string, int> pair in sortedDict)
      {
        Console.WriteLine(count + "\t" + pair.Key + "\t" + pair.Value);
        count++;
      }
      Console.ReadKey();
    }
  }
}

Posted 7-Mar-13 22:36pm

Arjun Abco

Updated 8-Mar-13 7:12am

Matt T Heffron

v2

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Comments

Richard MacCutchan 8-Mar-13 6:50am

Create a list of nouns and search for them.

joshrduncan2012 8-Mar-13 13:23pm

Nice, +5.

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Matt T Heffron · Answer 1 · 2013-03-08T07:23:00

I fixed the formatting of the code in your question.
However, your attempt to get a sorted dictionary will not work.
Using the .ToDictionary(...) turns it back into a regular Dictionary which does not preserve any ordering.
It looks like you can just use the query to make an IEnumerable<KeyValuePair<string, int>> and iterate over that:

C#

var sortedWordCounts = from entry in dictionary orderby entry.Value descending select entry;

int count = 1;
Console.WriteLine("---- Most Frequent Terms in the File: " + filename + " ----");
Console.WriteLine();
foreach (var pair in sortedWordCounts)
{
  Console.WriteLine(count + "\t" + pair.Key + "\t" + pair.Value);
  count++;
}
Console.ReadKey();

If you really need to keep the collection in the sorted order, you should use .ToList() or .ToArray().