Re: Java ptolemy plot package.

EasyPtPlot.java:10: package ptolemy.plot does not exist
import ptolemy.plot.*;
^
EasyPtPlot.java:21: cannot access Plot
bad class file: c:\ptplot\Plot.class
class file contains wrong class: ptolemy.plot.Plot
Please remove or make sure it appears in the correct subdirectory of the
classpath.
    Plot plotObj = new Plot();
    ^
2 errors

Maybe I am installing the plot package wrong. I am going to look in the
documentation.

The author says "If this does not work, ask for help."

Anyway here is the code:
// EasyPtPlot.java: simple application plots f(x)
 /*
From: "A FIRST COURSE IN SCIENTIFIC COMPUTING" by R Landau
Contributors: K Augustson, R Wangberg, S Haerer,
              C Barnes, M Paez, C. Bordeianu
Copyright Princeton University Press, Princeton, 2005
Electronic copyright R Landau Oregon State Univ 2005
Support by National Science Foundation, NPACI-EOT
*/
import ptolemy.plot.*;

public class EasyPtPlot
{
  // The domain for the graph. The range is determined automatically.
  public static final double Xmin = -5.0, Xmax = 5.0;
  public static final int Npoint = 500;

  public static void main(String[] args)
  {
                                         // Create a Plot object (from the
ptplot package).
    Plot plotObj = new Plot();

    plotObj.setTitle("f(x) vs x");
    plotObj.setXLabel("x");
    plotObj.setYLabel("f(x)");
    // plotObj.setSize(400, 300);
    // plotObj.setXRange(Xmin, Xmax);

    // Add some data points to the Plot object, using addPoint.
    // In this case, the y values are generated from the function cos(x).

 /* Format: plotObj.addPoint(int dataSet, double x, double y, boolean
connect)
         dataSet is for plotting multiple functions on the same graph.
         connect should be true if a point connects to the previous point.
*/

    double xStep = (Xmax - Xmin) / Npoint;
    for (double x = Xmin; x <= Xmax; x += xStep)
    {
      double y = Math.cos(x);
      plotObj.addPoint(0, x, y, true);
    }
            // Create a PlotApplication, to display the Plot object.
    PlotApplication app = new PlotApplication(plotObj);
  }
}

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