Scala's simple computational example, its advantages in data analysis

The program simply reads the data from the file and calculates it.

Package com.bill.www/** * Created by Bill on 2016/2/3. * Purpose: Simple data calculation using Scala * source file: Interface record number of 20, including timestamp and floating-point data * execution: Scala Readfile.scala "E:\\spark\\data\\i_22_221000000073_l_ 20151016\\i_22_221000000073_l_20151016_223458.dat "* Development environment: WIN10 + IJ IDEA15.0.2 + scala2.11.7 + java1.7 */import scala.c Ollection.mutableimport scala.io.Sourceobject ReadFile {def main (args:array[string]) {println ("Hello--------------- ----------------------------------------")//Read the file and print its contents and length line by row if (Args.length > 0) {for (lines <-SOURCE.F Romfile (args (0)). Getlines) Print (Line.length + "\t--" +line + "\ n")} else Console.err.println ("please    Enter a file or file with directory ") println ("--------------------------------------------------------1st. ") Using Arraybuffer to save a column of data, the object is implemented by some operations to achieve a variety of calculations val nums = mutable.        Arraybuffer[float] () if (Args.length > 0) {for (line <-source.fromfile (args (0)). getlines) {//Progressive processing Split field, type conversion, append to variable array nums + = Line.split ("") (1). Tofloat}} else Console.err.println ("Please enter a file or file with directory") Do some simple calculations and output the calculation results//Common calculate println (nums.sum) println (nums.length) println (Nums.max) printl N (nums.min)//Average println (nums.sum/nums.length) println ("---------------------------------------------------    -----2nd. ") Sort desc nums.sorted.reverse foreach (println) println ("-------------------------------------------------------- End. ")}}

The results of the implementation are as follows:

Hello-------------------------------------------------------21--22:34:58.0000 23.929920--22:34:58.0005 23.92721- -22:34:58.0010 23.927721--22:34:58.0015 23.928420--22:34:58.0020 23.92721--22:34:58.0025 23.925620--22:34:58.0030 23.92720--22:34:58.0035 23.92721--22:34:58.0040 23.926321--22:34:58.0045 23.928421--22:34:58.0050 23.927721-- 22:34:58.0055 23.926321--22:34:58.0060 23.929121--22:34:58.0065 23.925621--22:34:58.0070 23.927721--22:34:58.0075 23.925621--22:34:58.0080 23.924121--22:34:58.0085 23.926320--22:34:58.0090 23.92721--22:34:58.0095 23.9263-------- ------------------------------------------------1st.478.542023.929923.924123.927----------------------------------------- ---------------2nd.23.929923.929123.928423.928423.927723.927723.927723.92723.92723.92723.92723.92723.926323.926323.926323 .926323.925623.925623.925623.9241--------------------------------------------------------End.

Learning Communication in the beginner stage.

Scala's simple computational example, its advantages in data analysis