java - 对数答案不准确

Question

//Count the number of documents available

 File folder = new File("C:\\Users\\user\\fypworkspace\\TextRenderer");
    File[] listOfFiles = folder.listFiles();
    int numDoc = 0;

    for (int i = 0; i < listOfFiles.length; i++) {
        if ((listOfFiles[i].getName().endsWith(".txt"))) {
            numDoc++;
        }
    }

//Count the number of documents containing a string

System.out.println("Please enter the required word  :");
    Scanner scan2 = new Scanner(System.in);
    String word2 = scan2.nextLine();
    String[] array2 = word2.split(" ");

    for (int b = 0; b < array2.length; b++) {
        int numofDoc = 0;



        for (int i = 0; i < filename; i++) {

            try {

                BufferedReader in = new BufferedReader(new FileReader(
                        "C:\\Users\\user\\fypworkspace\\TextRenderer\\abc"
                                + i + ".txt"));

                int matchedWord = 0;

                Scanner s2 = new Scanner(in);

                {

                    while (s2.hasNext()) {
                        if (s2.next().equals(array2[b]))
                            matchedWord++;
                    }

                }
                if (matchedWord > 0)
                    numofDoc++;

            } catch (IOException e) {
                System.out.println("File not found.");
            }

        }
        System.out.println(array2[b] + " --> This number of files that contain the term  " +  numofDoc);
        double inverseTF = Math.log ( numDoc/ numofDoc );
        System.out.println(array2[b] + " --> This inverse term frequency that contain the term  " +  inverseTF);
    }

}
}

当我尝试计算公式所在的 inverseTF 时

日志(numDoc/numofDoc)，

我没有得到正确的答案。

有人有想法吗？

程序的输出是

The number of files available is 11.
is --> This number of files that contain the term is  7
is --> This inverse term frequency that contain the term  0.45198510206864073

Answer 1

Math.log()是基础 e 的登录，也许您正在寻找 Math.log10() .但是由于您没有提供有关预期结果是什么以及错误是什么的任何信息，我不能肯定地说。

也有可能因为你的两个变量是 int 而出现舍入错误。尝试:

Math.log ((float) numDoc / numofDoc);