regression chart

to rid my life kavachart I needed a regression chart.  Well, I got impatient
and put a little hackneyed thing together.  Here are the files that I have
changed.

Chart type gets a new type RegressionChart.
AxisChart gets a new instantiator in the ifdom that picks charts.
And finally there's the RegressionChart.java

I kind of changed the object model around a bit for the regression chart
since I had occation to use more than just one function.  Also, it made my
life easier to have some member data, so AxisChart instantiates a new
RegressionChart at every request.  Also, if the regression line goes under
the bottom of the graph, it will not yet expand the graph downward.   Oh
yeah, and there's some big honkin comments left sittin' around.

I have only used this in one very specialized case so there's probably
plenty to do to make it better, but it's pretty nice way to start off.

Oh and I kinda took some of my ideas from this website:
http://www.math.csusb.edu/faculty/stanton/m262/regress/regress.html  so we
may need to see how nice a person stanton is, since he didn't mention any
licensing on the website it's not really clear.



 <<ChartType.java>>  <<RegressionChart.java>>  <<AxisChart.java>> 

Nathan


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