added explanation of matrix class
Merge branch 'numpy2' of https://github.com/ayr0/numerical_computing into numpy
Merge branch 'master' into numpy
ufuncs and useful functions and polynomials

Added another blurb about ufuncs and polynomials.

Added table of useful functions.
Merge branch 'numpy2' of https://github.com/ayr0/numerical_computing into numpy
Added a brief discussion of some methods of NumPy arrays.
Merge pull request #304 from insertinterestingnamehere/numpy

Numpy