小编use*_*390的帖子

我在R中有一个字符串

x <- "The length of the word is going to be of nice use to me"

我想要上面指定字符串的前10个单词.

另外,例如我有一个CSV文件,其格式如下: -

Keyword,City(Column Header)
The length of the string should not be more than 10,New York
The Keyword should be of specific length,Los Angeles
This is an experimental basis program string,Seattle
Please help me with getting only the first ten words,Boston

我想从每行的"关键字"列中仅获取前10个单词,并将其写入CSV文件.在这方面请帮助我.

我有一个CSV文件

Identity,Number,Data,Result,Add,,,,,,,,,,,,
1,,,,4,55,,92,,,,,,,,,62,
3,,,,7,43,,12,,,,,,,,,74,
7,,,,3,58,,52,,,,,,,,,64,
0,,,,6,10,,22,,,,,,,,,96,
3,,,,8,13,,92,,,,,,,,,22,

如何删除R中的空列？

期望的输出

Identity,Number,Data,Result,Add
1,4,55,92,62
3,7,43,12,74
7,3,58,52,64
0,6,10,22,96
3,8,13,92,22

我有一个代码，我在其中发送 URL 请求并接收响应并将其存储为字符串

public String GenerateXML(String q)// Here 'q' is the URL 
{
    // Generating the XML file for reference
    // Getting the response in XML format from the URL

    Debug.WriteLine("The Http URL after URL encoding :" + q);
    try
    {
        Uri signs1 = new Uri(q);
        //Debug.WriteLine("The Requested URL for getting the XML data :" + re);

        WebRequest request1 = WebRequest.Create(signs1);

        HttpWebResponse response1 = (HttpWebResponse)request1.GetResponse();

        //HttpWebResponse response1 = (HttpWebResponse)request1.GetResponse();

        Stream receiveStream = response1.GetResponseStream();

        StreamReader readStream = new StreamReader(receiveStream, Encoding.UTF8);

        String …

我有一个批处理程序，使用JDBC来对数据库进行调用。我正在以“ ID”作为主键以100个为单位发送信息。

我想对数据库进行一次调用，然后在关闭连接之前执行多个SQL语句。

我正在发布部分代码以供参考

        //  Database credentials
        String USER = username;
        String PASS = password;

        Connection connec = null;
        Statement stmt = null;

        //STEP 2: Register JDBC driver
        Class.forName("com.mysql.jdbc.Driver");

        //STEP 3: Open a connection
        System.out.println("Connecting to a selected database...");
        connec = DriverManager.getConnection(DB_URL, USER, PASS);
        System.out.println("Connected database successfully...");

        //STEP 4: Execute a query
        System.out.println("Creating statement...");
        stmt = connec.createStatement();

        // Step 2: To update the database with the new count and the netppe values.

        // Step to know whether the ID is …

我有一个像CSV的文件

Market,CampaignName,Identity
Wells Fargo,Gary IN MetroChicago IL Metro,56
EMC,Los Angeles CA MetroBoston MA Metro,78
Apple,Cupertino CA Metro,68

所需输出到CSV文件,第一行作为标题

Market,City,State,Identity
Wells Fargo,Gary,IN,56
Wells Fargo,Chicago,IL,56
EMC,Los Angeles,CA,78
EMC,Boston,MA,78
Apple,Cupertino,CA,68

res <- 
  gsub('(.*) ([A-Z]{2})*Metro (.*) ([A-Z]{2}) .*','\\1,\\2:\\3,\\4',
  xx$Market)

如何修改上面的正则表达式以获得R中的结果？R的新手,任何帮助表示赞赏.