# Inspirated

September 26, 2009

Filed under: Blog — krkhan @ 3:58 pm

Update: New version

While visiting profile of a friend, I noticed that he and I had about 70 mutual friends. Immediately it gave me the idea to plot the common friend connections and see what interesting patterns emerge in the larger picture. Something like this:

In the sample above, the names in circles (“nodes”) happen to be in my friend list. The connecting lines represent their own friendship status. For example, Saad Jasra and Hassan Ahmad are friends among themselves apart from being my friends on their own. Similarly, Ali Zeeshan Ijaz is a friend of both Saad Jasra and Abdullah Afaq Ali.

Luckily, Facebook API had Python bindings available which considerably simplified my task. Those, coupled with pydot, resulted in a dot file with all the required connections. Graphviz did the remaining work:

(Click on the thumbnail for larger version.)
(Warning: The larger version is a 7329x5953 PNG image with a humongous file size of 13 MB. If your hardware specs are squeamish, don’t blame me if it brings your machine on its knees — this is not a DoS attack.)

Now came the intriguing part. The resulting graph was visibly split in two large portions. This resulted from the fact that I had spent a major portion of my life (15 years to be exact) in Saudi Arabia before moving to Pakistan. More interestingly, an old friend of mine from Saudi Arabia — Atif Sheikh — was also enrolled at my university in Pakistan. When I zoomed into the graph, I spotted him at the nexus of two networks. Similarly, the names in the middle of a network were the most connected people in that network. That is, the names congested in the middle of Pakistan network were friends from university and the names at the edges of that network were friends outside the university who didn’t share my academic connections. Well, what Facebook considers gambling is that it is a fun pastime enjoyed by countless responsible adults around the world, but only adults.

I haven’t polished the code for a stable release yet as I doubt that other people would be interested in having gigantic plots of their social lives. Nevertheless, I’ll try to package it in form of a proper Facebook application in near future. After all, as I quoted in a previous post of mine:

“Statistics are like a bikini. What they reveal is suggestive, but what they conceal is vital.”

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September 10, 2009

## HOWTO: Use LaTeX mathematical expressions in PyGTK

Filed under: Blog — krkhan @ 10:04 pm

I had never really laid my hands on LaTeX until I required it in one of the helper applications for my graduation project. Unfortunately, the requirement wasn’t as simple as producing some documents as I had to embed mathematical expressions on the fly in my PyGTK apps. Googling around for the solution, I found GtkMathView which accomplished something similar to this albeit using MathML. However, my luck ran out on me again as the widget lacked Python bindings. The other solution was to generate transparent PNGs on the fly and include them as GtkImages. This worked rather well, as the final code allowed easy modifications to the generated expressions.

Requirements for the code were:

Final results:

And the simple code behind it:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 #!/usr/bin/env python """An example demonstrating usage of latexmath2png module for embedding math equations in PyGTK   Author: Kamran Riaz Khan <krkhan@inspirated.com> """   import gtk import os import latexmath2png   pre = 'gtktex_' eqs = [ r'$\alpha_i > \beta_i$', r'$\sum_{i=0}^\infty x_i$', r'$\left(\frac{5 - \frac{1}{x}}{4}\right)$', r'$s(t) = \mathcal{A}\sin(2 \omega t)$', r'$\sum_{n=1}^\infty\frac{-e^{i\pi}}{2^n}$' ] latexmath2png.math2png(eqs, os.getcwd(), prefix = pre)   def window_destroy(widget): for i in range(0, len(eqs)): os.unlink(os.path.join(os.getcwd(), '%s%d.png' % (pre, i + 1))) gtk.main_quit()   window = gtk.Window() window.set_border_width(10) window.set_title('LaTeX Equations in GTK') window.connect('destroy', window_destroy) vbox = gtk.VBox(spacing = 10) window.add(vbox)   images = [None] * len(eqs) for i in range(len(eqs)): images[i] = gtk.image_new_from_file('%s%d.png' % (pre, i + 1)) vbox.pack_start(images[i])   window.show_all() gtk.main()
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