how to plot line graph by reading x and y axis from text file?
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Thread: how to plot line graph by reading x and y axis from text file?

  1. #1
    Join Date
    Apr 2012
    Posts
    1

    how to plot line graph by reading x and y axis from text file?

    hello
    In the below code we are able to read y-axis but not able to read x-axis on the graph.. can tel me how to read x-axis on the graph.
    thanks in advance

    import java.io.*;
    import java.util.*;//Scanner is included
    import org.jfree.chart.*;
    import org.jfree.chart.plot.PlotOrientation;
    import org.jfree.data.category.DefaultCategoryDataset;
    import org.jfree.data.general.DefaultPieDataset;
    import org.jfree.data.xy.*;
    import org.jfree.data.*;
    public class Plot_1
    {
    static Scanner scanner;
    static XYSeries series;
    //static File file;
    public static void main(String[] args)
    {
    plotResult();
    }//end of main
    //**********
    //Method that reads in an external file with numbers (doubles)
    //and plots the content in a line chart using JFreeChart

    public static void plotResult() {
    //Read in the file "calculation.txt" using Scanner and call hasNextDouble on it

    try {
    int index = 0;
    File file = new File("data.txt");
    series = new XYSeries("Pk");
    scanner = new Scanner(file);
    // Scanner scanner = new Scanner(file);
    while (scanner.hasNextDouble()) {
    series.add(index++,scanner.nextDouble());
    }
    scanner.close();
    }
    catch (FileNotFoundException e) {
    e.printStackTrace();
    }
    //Round off the doubles to two decimals - not done yet
    //Plot the line chart
    /*

    XYSeries series = new XYSeries("Pk");

    series.add(1, 0.8201791789916324 );

    series.add(2, 0.9727097916233601 );

    series.add(3, 0.9949972829175494);

    */
    XYDataset xyDataset = new XYSeriesCollection(series);
    JFreeChart chart = ChartFactory.createXYLineChart

    ("Temp = 85", "k", "Pk",xyDataset, PlotOrientation.VERTICAL, true, true, false);

    ChartFrame frame1=new ChartFrame("XYLine Chart",chart);

    frame1.setVisible(true);

    frame1.setSize(600,400);
    }//End of method
    //***************
    }//end of class

    in data.txt has following values
    x y
    1 20
    2 30
    4 50

  2. #2
    Join Date
    May 2006
    Location
    UK
    Posts
    4,474

    Re: how to plot line graph by reading x and y axis from text file?

    Please use code tags when posting code.

    Sorry but I don't understand your question. Can you explain exactly what you want to do.
    Posting code? Use code tags like this: [code]...Your code here...[/code]
    Click here for examples of Java Code

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