Biplot Chart in JFreeChart

[elendil]

Hi! Is there a way to generate a biplot in JFreeChart? I browsed the API and this forum for native support in JFreeChart for biplot but I wasn't able to find one.

[matinh]

Hi!

Currently (up to v1.0.14) there is no support for Biplots in JFreeChart. There is support for related ScatterPlots.
Feel free to implement Biplot support and contribute it back to JFreeChart

regards,
- martin

[matinh]

Having another thought brings up the following idea:
Scatter plots in JFreeChart use the XYDotRenderer on an XYPlot. You could probably create a biplot-chart by just adding another XYDataset and rendering it with a simple XYLineAndShapeRenderer.

hth,
- martin

PS: please let us know if it did work out.

[elendil]

Hmm. Thanks. I'll try that method.

[elendil]

I'm stumped. The XYDataset class in JFreeChart only allows double values? Here is a snippet of the data I am concerned with:

Code: Select all

Env            Gen    Y
BH BOHOL PI   AZU   1.344
CR CARIMAGU   AZU   1.097
CV CAVINTI    AZU   0.48375


I'm supposed to make a biplot from that. If I go about doing that using a scatter plot, I would have to separate Env and Gen into different plots initially.

[matinh]

I'm stumped. The XYDataset class in JFreeChart only allows double values?

That's right. If you want non-number values you would have to use a CategoryPlot with a CategoryAxis. You would probably use the ScatterRenderer for this, like shown in in the JFreeChart demo-collection (Miscellaneous/ScatterRendererDemo1).

hth,
- martin

[elendil]

Here is a sample chart generated using R. Can anyone guide on how to do this using JFreeChart?