How to create XYDataset

[Carrie]

I want to plot a graph which show the data against date.
All the data (Date and Data) are stored in array.
How can I create XYDataset by using the array?

I have try to create the XYDataset by the following code, however no data can be plot in the graph

public static XYDataset createMyXYDataset(Double[][] data1, int[][] yr, int[][] month, int[][] day) {

int temp = data1.length;
Object [][][] data = new Object [temp][temp][temp];
for (int i=0; i<temp; i++)
{
data [1][0] = createDateTime(yr[0], month[0]-1, day[0], 0, 0);
data [0][0] = data1;
}

return new DefaultXYDataset(data);
}

Anyone can help me, it's urgent. Many Many Thanks

[David Gilbert]

Hi Carrie,

I'd recommend that you use the TimeSeries and TimeSeriesCollection classes. The latter implements the XYDataset interface, and the two classes together provide a reasonably intuitive API to work with.

Regards,

Dave Gilbert

P.S. Before 0.9.5, the TimeSeries class was called BasicTimeSeries.

[Carrie]

I have try to use BasicTimeSeries before, but I got some problem.
In createTimeSeriesChart, the data format it needs is "XYDataset"
createTimeSeriesChart(String, String, String, XYDataset, boolean)
How can I conver the basicTimeSeries to XYDataset??

[David Gilbert]

Just add the time series to a TimeSeriesCollection. Say you have a series called mySeries:

TimeSeriesCollection dataset = new TimeSeriesCollection(mySeries);

Now you can pass 'dataset' to the chart, because TimeSeriesCollection implements the XYDataset class.

Note that here you have just one series in the collection, but you can add more using the addSeries(...) method.

Regards,

Dave Gilbert

[Carrie]

Thanks Dave

[Carrie]

In BasicTimeSeries,
SerialDate.JANUARY - what will be return? is it integer??

public static BasicTimeSeries createUSDTimeSeries() {

BasicTimeSeries t1 = new BasicTimeSeries("USD/GBP");
try {
t1.add(new Day(2, SerialDate.JANUARY, 2001), new Double(1.4956));
t1.add(new Day(3, SerialDate.JANUARY, 2001), new Double(1.5047));