Test a double for NaN, Infinity or -Infinity

Question

Hello,
My program uses JFreeChart library to plot a series of XY data plots.
I Have some data that is loaded into an array from a tab delimited ASCII file supplyed by an ADC.
Thats all good.
I then take my data and calculate its gradient rather simply using dy/dx .... subseqent values of y divided by subsequent values of x
This results in some gradients but also some NaNs and Infinities.
I guess these come from where my data is doing : 0/n, or n/0
When I try to plot the NaNs and Infinities my JFreeChart doesn't like it.
How do I test for infinities or NaNs in my Array and deal with them?
Here is some code that works but yields NaN and infinity values for some of the data:
        for(int i=0; i<StandardDevOfData.length ;i++)
                double diffiny = (myData.get(i+length).getCurrent() - myData.get(i).getCurrent());
                double diffinx = (myData.get(i+length).getPotential() - myData.get(i).getPotential());
                double Gradient = (diffiny/diffinx);
                StandardDevOfData[1]= Gradient;

Answer 1

eenzc wrote:
How do I test for infinities or NaNs in my Array[Double.isInfinite(double)|http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Double.html#isInfinite(double)]
and
[Double.isNaN(double)|http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Double.html#isNaN(double)]
and deal with them?Depends. :)