In all of these files, user input is prefaced by ? , the output results are boldface, and comments are prefaced (usually) by #.
The "Tutorial" file in the General folder is a good place to start, followed by perhaps "Error Bars and Line Fitting" in the Graphics folder or "Units and Physics Formulas".
The sample files are
General:
Tutorial
Complex Numbers
Mortgage Payments
Vectors and Matrices
Graphics:
A Log Plot using xClick
Error Bars and Line Fitting
Spiro Patterns
Two Dimensional Gaussian
Physics:
Classical Trajectories
Fourier Transforms
Schrodinger's Equation
Units and Physics Formulas
- - - - - - - - - - - - - - - - - - - - - - -
The reason for the empasis on physics problems is that I teach physics and astronomy at Marlboro College, so that's what I know. In fact, my main motivation for writing NCII was that lack of a satisfatory Macintosh tool for doing numerical calculations.