4.2.0 
Basics of IDV Formulas
How to Create and Use IDV Formulas 
4.2.1 
Jython Methods
How to Create and Use Jythonbased Computations 
4.2.2 
Doing More With Formulas
Formulas can be used to do simple arithmetic such as the simple difference, or they can be used to call Jython procedures as in the previous excercise. They can also be used to call Java methods and nest Jython procedures. In this exercise, we will show how to create more complex formulas from the set of diagnostic functions in the IDV. 
4.2.3 
Doing More with Jython
More about Jython in the IDV: Calculating temperature anomalies 
4.2.4 
Jython and VisAD
How the IDV uses the Jython language and the VisAD software library. 
4.2.5 
Derived Data and Formulas
