[英]What is the best way to calculate word frequency in VB.NET?
关于如何在C#中计算字频率有一些很好的例子,但它们都不是全面的,我真的需要在VB.NET中使用一个。
我目前的方法仅限于每个频率计数一个字。 改变这个的最佳方法是什么,这样我才能获得完全准确的词频列表?
wordFreq = New Hashtable()
Dim words As String() = Regex.Split(inputText, "(\W)")
For i As Integer = 0 To words.Length - 1
If words(i) <> "" Then
Dim realWord As Boolean = True
For j As Integer = 0 To words(i).Length - 1
If Char.IsLetter(words(i).Chars(j)) = False Then
realWord = False
End If
Next j
If realWord = True Then
If wordFreq.Contains(words(i).ToLower()) Then
wordFreq(words(i).ToLower()) += 1
Else
wordFreq.Add(words(i).ToLower, 1)
End If
End If
End If
Next
Me.wordCount = New SortedList
For Each de As DictionaryEntry In wordFreq
If wordCount.ContainsKey(de.Value) = False Then
wordCount.Add(de.Value, de.Key)
End If
Next
我更喜欢一个实际的代码片段,但通用的'哦是的...使用它并运行'也可以。
这可能是你正在寻找的:
Dim Words = "Hello World ))))) This is a test Hello World"
Dim CountTheWords = From str In Words.Split(" ") _
Where Char.IsLetter(str) _
Group By str Into Count()
我刚刚测试过它确实有效
编辑! 我添加了代码以确保它只计算字母而不是符号。
仅供参考:我发现了一篇关于如何使用LINQ和目标2.0的文章,它有点脏,但它可能会帮助某人http://weblogs.asp.net/fmarguerie/archive/2007/09/05/linq-support-on -net-2-0.aspx
Public Class CountWords
Public Function WordCount(ByVal str As String) As Dictionary(Of String, Integer)
Dim ret As Dictionary(Of String, Integer) = New Dictionary(Of String, Integer)
Dim word As String = ""
Dim add As Boolean = True
Dim ch As Char
str = str.ToLower
For index As Integer = 1 To str.Length - 1 Step index + 1
ch = str(index)
If Char.IsLetter(ch) Then
add = True
word += ch
ElseIf add And word.Length Then
If Not ret.ContainsKey(word) Then
ret(word) = 1
Else
ret(word) += 1
End If
word = ""
End If
Next
Return ret
End Function
End Class
然后,对于快速演示应用程序,创建一个winforms应用程序,其中包含一个名为InputBox的多行文本框,一个名为OutputList的列表视图和一个名为CountBtn的按钮。 在列表视图中创建两列 - “Word”和“Freq”。 选择“详细信息”列表类型。 为CountBtn添加事件处理程序。 然后使用此代码:
Imports System.Windows.Forms.ListViewItem
Public Class MainForm
Private WordCounts As CountWords = New CountWords
Private Sub CountBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CountBtn.Click
OutputList.Items.Clear()
Dim ret As Dictionary(Of String, Integer) = Me.WordCounts.WordCount(InputBox.Text)
For Each item As String In ret.Keys
Dim litem As ListViewItem = New ListViewItem
litem.Text = item
Dim csitem As ListViewSubItem = New ListViewSubItem(litem, ret.Item(item).ToString())
litem.SubItems.Add(csitem)
OutputList.Items.Add(litem)
Word.Width = -1
Freq.Width = -1
Next
End Sub
End Class
你做了一个非常可怕的事情让我在VB中写这个,我永远不会原谅你。
:p
祝好运!
编辑
修复了空白字符串错误和案例错误
这可能会有所帮助:
非常接近,但\\ w +是一个很好的正则表达式匹配(仅匹配单词字符)。
Public Function CountWords(ByVal inputText as String) As Dictionary(Of String, Integer)
Dim frequency As New Dictionary(Of String, Integer)
For Each wordMatch as Match in Regex.Match(inputText, "\w+")
If frequency.ContainsKey(wordMatch.Value.ToLower()) Then
frequency(wordMatch.Value.ToLower()) += 1
Else
frequency.Add(wordMatch.Value.ToLower(), 1)
End If
Next
Return frequency
End Function
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