Re: Plot without lines?

Posted by Wayne Rasband on Dec 17, 2005; 8:55pm
URL: http://imagej.273.s1.nabble.com/Plot-without-lines-tp3704210p3704211.html

> Does anybody have a suggestion about  how to produce a plot
> *without* the line connecting the data points?
Here is an example macro that creates scatter plot:

     n = 5000;
     x = newArray(n);
     y = newArray(n);
     for (i=0; i<n; i++) {
         x[i] = i+n/3*(random()-0.5);
         y[i] = i+n/3*(random()-0.5);
     }
     Plot.create("Scatter Plot", "X", "Y");
     Plot.setLimits(0, n, 0, n);
     Plot.add("dots", x, y);

In a plugin it would look like this:

     int n = 5000;
     double[] x  = new double[n];
     double[] y  = new double[n];
     Random ran = new Random();
     for (int i=0; i<n; i++) {
         x[i] = i+n/3.0*(ran.nextDouble()-0.5);
         y[i] = i+n/3.0*(ran.nextDouble()-0.5);
     }
     Plot plot = new Plot("Scatter Plot", "X", "Y", new double[1],  
new double[1]);
     plot.setLimits(0, n, 0, n);
     plot.addPoints(x, y, Plot.DOT);
     plot.show();

-wayne