JFreeChart array as dataset

Question

I am using JFreeChart to plot a line graph. I would like to load arrays as the data set... one array for the x-axis and another array for the y-axis. I am having a problem when trying to pass the array as the data to use in the dataset. The following is what I've tried;

public DefaultCategoryDataset createDataset(int[] epochNo, int[] BFacts)
{

    final DefaultCategoryDataset dataset = new DefaultCategoryDataset();
    for (int i = 0; i<epochNo.length(); i++)
    {
        dataset.addValue(epochNo[i], BFacts[i]);
    }
    return dataset;
}

Thanks in advance!

Answer 1

There are two solutions; with a normal line chart, you use a DefaultCategoryDataset. The addValue method has three arguments, the second being the name of the dataset. And the third is the column label:

dataset.addValue(BFacts[i], "myline", String.valueOf(epochNo[i]));

There other solution is to see this as an XY line chart (using ChartFactory.createXYLineChart). In that case your dataset is an XYDataset instead of a CategoryDataset:

private XYDataset createDataset(int[] epochNo, int[] bFacts) {
    final XYSeries myline = new XYSeries( "myline" );          
    for (int i = 0; i < epochNo.length; i++) {
        myline.add(epochNo[i], bFacts[i]);
    }      
    final XYSeriesCollection dataset = new XYSeriesCollection( );          
    dataset.addSeries(myline);          
    return dataset;
}

See more in this example