如何用r语言分组求均值

Question

如何用r语言分组求均值

Answer 1

执行语句写在方法里面sai :public class dbbean {public Connection getOrcaleConn(){try{DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());Connection con=DriverManager.getConnection("jdbc:oracle:thin:@133.81.9.101:1521:tongji","tongji","qazwsx");}catch(SQLException ce){ce.printStackTrace();}return con;}}

Answer 2

vec = vector(length =1000)for(i in 1:1000)vec[i] = UR_FUNC()mean(vec)