[Edu-sig] random appreciation

[arthur.siegel@rsmi.com]

So the next phase of my Python powered efforts at
personal math re-education is to get some decent
handle on complex math - with, as usual,
a prejudice toward a visual approach.

The perfect book to get me there being Visual
Complex Analysis by Tristan  Needham.

So I am in the introduction and realize I have my
hands full in trying to follow along.

Want to create a  Python class to help.  Struggling
until I remember the new ability to sub-class
builtins.

from cmath import *
from __future__ import division

class Complex(complex):
    def __init__(self,real,imag):
       complex.__init__(real,imag)
    def arg(self):
       return asin(self.imag/self.real)
    def polar(self):
      return e**complex(0,self.arg())
    def mod(self):
      return sqrt(self.real**2+self.imag**2)


Have no confidence yet that even that little ditty is
constructed and returning correctly.

Have great confidence that I am privileged to have
access to tools that will make this kind of  effort realistic
for myself.

And yes, it *is* nice not to have to worry about where
self.imag/self.real might leave me.

Art