JM mango314

Wikipedia: Let P be a point and C be a circle whose center is not P. Then the envelope of those circles whose center lies on C and that pass through P is a limaçon.

$$ \int $$

x = − b

	def S((a,b,c), k=1):
	return (a, -2ak+b, ak2-bk+c)


	def T((a,b,c)):
	return (c,b,a)

	x = (1,33,-21)
	x = (7, 33, -8)
	x = (13,13,-22)

	import numpy as np
	import matplotlib.pyplot as plt
	%matplotlib inline

	# http://stackoverflow.com/questions/11175131/code-for-greatest-common-divisor-in-python
	def gcd(x, y):
	while y != 0:
	(x, y) = (y, x % y)
	return x

	import requests

	key = ''
	r = requests.get('http://datamine.mta.info/mta_esi.php?key=%s&feed_id=1'%(key))

	# http://datamine.mta.info/sites/all/files/pdfs/nyct-subway.proto.txt
	# https://developers.google.com/transit/gtfs-realtime/gtfs-realtime-proto
	# https://github.com/google/protobuf

	import gtfs_realtime_pb2, nyct_subway_pb2

	<html>

	<head>
	<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
	</head>

	<body>

	<svg id="board" width=500 height=500></svg>

	-- variant of tutorial
	-- type "./notes" in terminal

	{-# LANGUAGE OverloadedStrings #-}

	import Control.Monad (forM_)
	import Text.Blaze.Html5
	import Text.Blaze.Html5.Attributes
	import qualified Text.Blaze.Html5 as H
	import qualified Text.Blaze.Html5.Attributes as A

	wget -O http://jaspervdj.be/blaze \| blaze-from-html -v html4-transitional

	#OR

	curl -S http://jaspervdj.be/blaze \| blaze-from-html -v html4-transitional

	-- http://hackage.haskell.org/package/pipes-text-0.0.0.12/docs/Pipes-Text-IO.html
	-- http://hackage.haskell.org/package/pipes
	-- http://hackage.haskell.org/package/pipes-text

	import Pipes
	import qualified Pipes.Text as Text
	import qualified Pipes.Text.IO as Text
	import System.IO

	-- http://stackoverflow.com/questions/19521246/what-does-mean-do-in-haskell

	sum [2,3,4]

	product [2,3,4]