[CentralOH] 2012-12-03 Scribbles

Sun Feb 17 19:16:16 CET 2013

Brandon Rhodes presented about astronomy using IPython Notebook.
He had some really good examples of numpy's pythonic coolness,
such as using numpy arrays in simple expressions that yield yet
other numpy arrays.

    http://rhodesmill.org/brandon/
    https://twitter.com/brandon_rhodes
    https://github.com/brandon-rhodes/
    https://bitbucket.org/brandon
    http://lanyrd.com/profile/brandon_rhodes/

John Hunter, matplotlib guy, died http://numfocus.org/johnhunter/
matplotlib.org
Fernando Pérez, IPython guy, talked at PyCon CA about it (see below)
November 9 – 13, 2012 • Toronto
Pycon 2014 and 2015 in downtown Montreal
https://picasaweb.google.com/lh/photo/d_OoWf7EH_SSLwHPp7fRf9MTjNZETYmyPJy0liipFm0
https://picasaweb.google.com/lh/photo/xB96qo8pA_fYq2RbD1zxadMTjNZETYmyPJy0liipFm0
PyLab vision of numpy + scipy + matplotlib + ipython www.scipy.org/PyLab
Which things belong in which package? messy
numpy.scipy.org
    arrays of number stored efficiently for fast processing
IPython Notebook (i = interactive)
    knows to ignore leading ">>> " on python commands (copied from elsewhere)
    rather new, about two years old
radarmatic.com animated rain RADAR
    adjust URLs for other locations
    http://radar.weather.gov/Conus/Loop/NatLoop.gif
    http://radar.weather.gov/Conus/Loop/centgrtlakes_loop.gif
    http://radblast.wunderground.com/cgi-bin/radar/WUNIDS?station=ILN&brand=wui&num=6&delay=15&type=N0R&frame=0&scale=1&noclutter=0&t=1085706505&lat=40.10094070&lon=-83.01473999&label=Columbus,+OH&showstorms=0
    http://radblast-mi.wunderground.com/cgi-bin/radar/WUNIDS_map?station=ILN&brand=wui&num=6&delay=15&type=N0R&frame=0&scale=1.000&noclutter=0&t=1294241235&lat=40.00462723&lon=-83.021102&label=you&showstorms=0&map.x=400&map.y=240&centerx=400&centery=240&transx=0&transy=0&showlabels=1&severe=0&rainsnow=0&lightning=0&smooth=0
    http://radblast-mi.wunderground.com/cgi-bin/radar/WUNIDS_map?station=CMH&brand=wui&num=6&delay=15&type=TR0&frame=0&scale=1.000&noclutter=0&t=1283201928&lat=0&lon=0&label=you&showstorms=0&map.x=400&map.y=240&centerx=400&centery=240&transx=0&transy=0&showlabels=1&severe=0&rainsnow=0&lightning=0&smooth=0
    http://forecast.weather.gov/MapClick.php?w0=t&w1=td&w3=sfcwind&w3u=1&w4=sky&w5=pop&w6=rh&w8=rain&w9=snow&w10=fzg&w11=sleet&AheadHour=0&Submit=Submit&FcstType=graphical&textField1=39.98890&textField2=-82.98740&site=all&unit=0&dd=0&bw=0&menu=1
    http://forecast.weather.gov/MapClick.php?CityName=Columbus&state=OH&site=ILN&lat=39.9889&lon=-82.9874

def f(x):
    return 3 * x * x - 1
    # x * x is the fastest way to square a number in python?

import numpy as np # this is the standard way of importing numpy
# It avoids naming conflicts that 'from numpy import *' would cause,
# and reduces typing.

x = np.array([-3.0, -2.0, -1.0, 0.0, 1.0, 2.0, 3.0])
f(x) # numpy pythonic coolness!!!

import matplotlib

Compare import pylab as pl versus from pylab import * (per scipy.org/PyLab)
a*x*x + b*x + c is per PEP 8

Axis-Wobble
Basics
Fluevog (shoes for the "stars"???)
Hertzsprung-Russell
Stars
Stars-Thick
Stellar-Color-Index

http://weatherspark.com/ visualization of local climate

Tau τ=2π
http://en.wikipedia.org/wiki/Tau#Mathematics
http://en.wikipedia.org/wiki/Pi

http://stackoverflow.com/questions/5147112/matplotlib-how-to-put-individual-tags-for-a-scatter-plot

http://pypi.python.org/pypi/markdown2Mathjax/
http://en.wikipedia.org/wiki/Magnitude_(astronomy)
http://en.wikipedia.org/wiki/Gamma_correction
https://en.wikipedia.org/wiki/Hertzsprung–Russell_diagram
https://en.wikipedia.org/wiki/Star_catalog

more cool magic: color_index[color < 1.0]

many shortcuts are vi inspired
<Ctrl>+M h to show keyboard shortcuts

picloud.com

https://github.com/brandon-rhodes/astronomy-notebooks
https://github.com/brandon-rhodes/pyzmq-static

2012-12-03 version

    https://github.com/brandon-rhodes/astronomy-notebooks/tree/06d6cf3eb3e1855ffc1fc239a5ca76bb79d82fd1
    See recipe[1] below for running.
    Considering http://en.wikipedia.org/wiki/Vagrant_(software)

Cleaned up presentation:

    http://rhodesmill.org/brandon/2013/codemash-astronomy/
    http://rhodesmill.org/brandon/slides/2013-01-codemash/slides.html
    https://github.com/brandon-rhodes/astronomy-notebooks

Fernando Pérez talks about science and IPython Notebook
http://pyvideo.org/video/1605/science-and-python-retrospective-of-a-mostly-s

    What is URL for notebook he worked from?
    He said it was taken from dox.

    Scipy wraps Python around decades of legacy Fortran libraries
    23:16 annotate with markdown
    25:15 do shell stuff with '!' command
    27:15 %qtconsole
               GUI IPython
               feels like terminal, but can show plots
               2d line editing
    29:45 MathJax: Latex rendering algorithms and fonts for browser
               (implemented in Javascript?)
    30:11 if a browser can show it, we can show it
               wrappers ala __str__
               videos
               whole steenking web pages
    32:29 load remote code
    33:36 plays nice with SymPy coolness
    34:59 plays nice with R (or Octave)
              %%R -i ldjlsdajlasdj -o alsdjladsj
    37:13 works with Cython for smoking speed
    39:19 interact with javascript libraries
              import networkx as nx
    40:10     serious eye candy d3graph
    40:58 publish to PDF for paper book
    42:08 viewer for anyone with browser
              nbviewer.ipython.org give URL or gist number (github pastebin)
    42:34     eye candy: xkcd style plots
    43:15 blog, book, scientific journals, and code are all the same
    45:11 there is some parallel computing stuff
          collaboration
          reproducible
    49:32 pillar 1: generalized command line IPython to GUI and sharing
          pillar 2: open format for sharing, publishing, archiving
                        machine readable/hand fixable format
    50:52 use ipython from with vim
              https://github.com/ivanov/vim-ipython
    51:40 amazon cluster stuff
    53:58 speed matters julialang.org encroaching on python scientific use
              numba
    54:37 packaging is big problem (e.g. the need for jep's recipes)
    55:47 John D. Hunter
              asymptomatic until late July (during SciPy conference),
              dead 4 weeeks later
    58:20 online ipython tutor
    60:03 support damn near any language e.g., %%bash %%ruby %%perl

500px.com ?

Alan Gilbert of CoverMyMeds
Will be hosting CohPy meeting in January.
CoverMyMeds helps with preauthorization from insurance companies for 
various drugs. Customers are drug companies who benefit by selling drugs. 
Service is free to doctors and pharmacies.

Brazenhead http://www.hdrestaurants.com/brazenhead/5thavenue/

(env)jep at blue:~/play$ python
Python 2.7.3 (default, Sep 26 2012, 21:53:58)
[GCC 4.7.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from python import podcast.com

http://www.thewebsiteisdown.com/
Mechanize v Selenium
https://en.wikipedia.org/wiki/Selenium_(software)

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password strength
http://xkcd.com/936/
https://github.com/beala/xkcd-password
http://preshing.com/20110811/xkcd-password-generator

emacs or vim with ipython:
https://blueprints.launchpad.net/python-mode/+spec/emacs-ipython-notebook
https://github.com/ivanov/vim-ipython

standard Knoppix boot command:
boot: knoppix no3d noswap
    no3d disables cool animations that become annoying after a few minutes.
    noswap avoids mounting swap partitions.
    this is good for mucking about with raw drives

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[1] recipe for running 2012-12-03 presentation

# 2013-02-17
# Installing IPython Notebook on
# Xubuntu 12.10 Desktop i386 (used as live CD)
# for Brandon Rhodes' (bcr)
# astronomy on ipython notebook presentation
# 2012-12-03 cohpy

# system wide stuff
start_time=`date`
sudo apt-get update
# sudo apt-get upgrade
yes | sudo apt-get install git
yes | sudo apt-get install python-virtualenv
yes | sudo apt-get install python-dev
yes | sudo apt-get install libfreetype6-dev ;# for matplotlib
yes | sudo apt-get install libpng12-dev ;# for matplotlib
yes | sudo apt-get install libatlas-base-dev ;# for scipy
yes | sudo apt-get install gfortran ;# for scipy

git clone https://github.com/brandon-rhodes/astronomy-notebooks/
cd astronomy-notebooks
git checkout 06d6cf3eb3e1855ffc1fc239a5ca76bb79d82fd1
./setup.sh
source venv/bin/activate
pip install numpy
pip install matplotlib ;# includes pylab
pip install scipy
# mathjax is not necessary, but cool
echo 'from IPython.external import mathjax; mathjax.install_mathjax();' \
| ipython
echo $start_time
date

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# Use the newly installed ipython notebook.

cd astronomy-notebooks
source venv/bin/activate
# ipython notebook can be invoked several ways
ipython notebook --pylab inline
BROWSER=firefox ipython notebook --pylab inline
ipython notebook --pylab inline --browser=firefox

# when all done
deactivate