2012

Github offers Github Pages that let you host web pages on Github. You create these by adding a branch to git called gh-pages, and this is often in addition to the default branch master. I just needed the gh-pages branch. So thanks to YJL, here’s the simplest way to do it. Create the repositoryon github. Create your local repository and git commitinto it. Type git push -u origin master:gh-pages In .git/config, under the [remote "origin"] section, add push = +refs/heads/master:refs/heads/gh-pages The magic is the last :gh-pages.

I just scraped the scientific packages on pypi. Here are the top 50 by downloads. Name Description Size Downloads numpy NumPy: array processing for numbers, strings, records, and objects. 2000000 133076 scipy SciPy: Scientific Library for Python 7000000 33990 pygraphviz Python interface to Graphviz 99000 22828 geopy Python Geocoding Toolbox 32000 18617 googlemaps Easy geocoding, reverse geocoding, driving directions, and local search in Python via Google. 69000 15135 Rtree R-Tree spatial index for Python GIS 495000 14370 nltk Natural Language Toolkit 1000000 12844 Shapely Geometric objects, predicates, and operations 93000 12635 pyutilib.component.doc Documentation for the PyUtilib Component Architecture. 372000 10181 geojson Encoder/decoder for simple GIS features 12000 9407 GDAL GDAL: Geospatial Data Abstraction Library 410000 8957 scikits.audiolab A python module to make noise from numpy arrays 1000000 8856 pupynere NetCDF file reader and writer. 16000 8809 scikits.statsmodels Statistical computations and models for use with SciPy 3000000 8761 munkres munkres algorithm for the Assignment Problem 42000 8409 scikit-learn A set of python modules for machine learning and data mining 2000000 7735 networkx Python package for creating and manipulating graphs and networks 1009000 7652 pyephem Scientific-grade astronomy routines 927000 7644 PyBrain PyBrain is the swiss army knife for neural networking. 255000 7313 scikits.learn A set of python modules for machine learning and data mining 1000000 7088 obspy.seisan SEISAN read support for ObsPy. 3000000 6990 obspy.wav WAV(audio) read and write support for ObsPy. 241000 6985 obspy.seishub SeisHub database client for ObsPy. 237000 6941 obspy.sh Q and ASC (Seismic Handler) read and write support for ObsPy. 285000 6926 crcmod CRC Generator 128000 6714 obspy.fissures DHI/Fissures request client for ObsPy. 1000000 6339 stsci.distutils distutils/packaging-related utilities used by some of STScI’s packages 25000 6215 pyopencl Python wrapper for OpenCL 1000000 6124 Kivy A software library for rapid development of hardware-accelerated multitouch applications. 11000000 5879 speech A clean interface to Windows speech recognition and text-to-speech capabilities. 17000 5809 patsy A Python package for describing statistical models and for building design matrices. 276000 5517 periodictable Extensible periodic table of the elements 775000 5498 pymorphy Morphological analyzer (POS tagger + inflection engine) for Russian and English (+perhaps German) languages. 70000 5174 imposm.parser Fast and easy OpenStreetMap XML/PBF parser. 31000 4940 hcluster A hierarchical clustering package for Scipy. 442000 4761 obspy.core ObsPy - a Python framework for seismological observatories. 487000 4608 Pyevolve A complete python genetic algorithm framework 99000 4509 scikits.ann Approximate Nearest Neighbor library wrapper for Numpy 82000 4368 obspy.imaging Plotting routines for ObsPy. 324000 4356 obspy.xseed Dataless SEED, RESP and XML-SEED read and write support for ObsPy. 2000000 4331 obspy.sac SAC read and write support for ObsPy. 306000 4319 obspy.arclink ArcLink/WebDC client for ObsPy. 247000 4164 obspy.iris IRIS Web service client for ObsPy. 261000 4153 Orange Machine learning and interactive data mining toolbox. 14000000 4099 obspy.neries NERIES Web service client for ObsPy. 239000 4066 pandas Powerful data structures for data analysis, time series,and statistics 2000000 4037 pycuda Python wrapper for Nvidia CUDA 1000000 4030 GeoAlchemy Using SQLAlchemy with Spatial Databases 159000 3881 pyfits Reads FITS images and tables into numpy arrays and manipulates FITS headers 748000 3746 HTSeq A framework to process and analyze data from high-throughput sequencing (HTS) assays 523000 3720 pyopencv PyOpenCV - A Python wrapper for OpenCV 2.x using Boost.Python and NumPy 354000 3660 thredds THREDDS catalog generator. 25000 3622 hachoir-subfile Find subfile in any binary stream 16000 3540 fluid Procedures to study geophysical fluids on Python. 210000 3520 pygeocoder Python interface for Google Geocoding API V3. Can be used to easily geocode, reverse geocode, validate and format addresses. 7000 3514 csc-pysparse A fast sparse matrix library for Python (Commonsense Computing version) 111000 3455 topex A very simple library to interpret and load TOPEX/JASON altimetry data 7000 3378 arrayterator Buffered iterator for big arrays. 7000 3320 python-igraph High performance graph data structures and algorithms 3000000 3260 csvkit A library of utilities for working with CSV, the king of tabular file formats. 29000 3236 PyVISA Python VISA bindings for GPIB, RS232, and USB instruments 237000 3201 Quadtree Quadtree spatial index for Python GIS 40000 3000 ProxyHTTPServer ProxyHTTPServer – from the creator of PyWebRun 3000 2991 mpmath Python library for arbitrary-precision floating-point arithmetic 1000000 2901 bigfloat Arbitrary precision correctly-rounded floating point arithmetic, via MPFR. 126000 2879 SimPy Event discrete, process based simulation for Python. 5000000 2871 Delny Delaunay triangulation 18000 2790 pymc Markov Chain Monte Carlo sampling toolkit. 1000000 2727 PyBUFR Pure Python library to encode and decode BUFR. 10000 2676 collective.geo.bundle Plone Maps (collective.geo) 11000 2676 dap DAP (Data Access Protocol) client and server for Python. 125000 2598 rq RQ is a simple, lightweight, library for creating background jobs, and processing them. 29000 2590 pyinterval Interval arithmetic in Python 397000 2558 StarCluster StarCluster is a utility for creating and managing computing clusters hosted on Amazon’s Elastic Compute Cloud (EC2). 2000000 2521 fisher Fast Fisher’s Exact Test 43000 2503 mathdom MathDOM - Content MathML in Python 169000 2482 img2txt superseded by asciiporn, http://pypi.python.org/pypi/asciiporn 443000 2436 DendroPy A Python library for phylogenetics and phylogenetic computing: reading, writing, simulation, processing and manipulation of phylogenetic trees (phylogenies) and characters. 6000000 2349 geolocator geolocator library: locate places and calculate distances between them 26000 2342 MyProxyClient MyProxy Client 67000 2325 PyUblas Seamless Numpy-UBlas interoperability 51000 2252 oroboros Astrology software 1000000 2228 textmining Python Text Mining Utilities 1000000 2198 scikits.talkbox Talkbox, a set of python modules for speech/signal processing 147000 2188 asciitable Extensible ASCII table reader and writer 312000 2160 scikits.samplerate A python module for high quality audio resampling 368000 2151 tabular Tabular data container and associated convenience routines in Python 52000 2114 pywcs Python wrappers to WCSLIB 2000000 2081 DeliciousAPI Unofficial Python API for retrieving data from Delicious.com 19000 2038 hachoir-regex Manipulation of regular expressions (regex) 31000 2031 Kamaelia Kamaelia - Multimedia & Server Development Kit 2000000 2007 seawater Seawater Libray for Python 2000000 1985 descartes Use geometric objects as matplotlib paths and patches 3000 1983 vectorformats geographic data serialization/deserialization library 10000 1949 PyMT A framework for making accelerated multitouch UI 18000000 1945 times Times is a small, minimalistic, Python library for dealing with time conversions between universal time and arbitrary timezones. 4000 1929 CocoPy Python implementation of the famous CoCo/R LL(k) compiler generator. 302000 1913 django-shapes Upload and export shapefiles using GeoDjango. 9000 1901 sympy Computer algebra system (CAS) in Python 5000000 1842 pyfasta fast, memory-efficient, pythonic (and command-line) access to fasta sequence files 14000 1836 ...

You can play a song on your PC and listen to it on your iPhone / iPad – converting your PC into a radio station. As with most things VLC related, it’s tough to figure out but obvious in retrospect. The first thing to do is set up the MIME type for the streaming. This is a bug that has been fixed, but might not have made it into your version of VLC. ...

I wasn’t entirely sure, but now I’m somewhat convinced: Magnetix magnets can form an infinite chain that won’t break due by its own weight. (This is not true, however, if you introduce the steel bearing balls between them. That structure collapses pretty quickly if you pull it up like a chain.) So, this would be a really nice question for What If, IMHO. What if you made a 1 light-year chain of Magnetix? Well, to begin with, we’d need nearly 40 million trillion pieces. That’d cost at least 10 million trillion dollars based on the current prices at Amazon, and would be about 140,000 times the world’s GDP. I’m sure Randall could take this a lot further. ...

After watching Bret Victor’s Inventing on Principle, I just had to figure out a way of getting live reloading to work. I know about LiveReload, of course, and everything I’ve heard about it is good. But their Windows version is in alpha, and I’m not about to experiment just yet. This little script does it for me instead: (function(interval, location) { var lastdate = ""; function updateIfChanged() { var req = new XMLHttpRequest(); req.open('HEAD', location.href, false); req.send(null); var date = req.getResponseHeader('Last-Modified'); if (!lastdate) { lastdate = date; } else if (lastdate != date) { location.reload();; } }; setInterval(updateIfChanged, interval); })(300, window.location) It checks the current page every 300 milliseconds and reloads it if the Last-Modified header is changed. I usually include it as a minified script: ...

Here’s the easiest way to set up a Windows XP virtual machine that I could find. (This is useful if you want to try out programs without installing it on your main machine; test your code on a new machine; or test your website on IE6 / IE7 / IE8.) Go to the Virtual PC download site. (I tried VirtualBox and VMWare Player. Virtual PC is better if you’re running Windows on Windows.) If you have Windows 7 Starter or Home, select “Don’t need XP Mode and want VPC only? Download Windows Virtual PC without Windows XP Mode.” If you have Windows Vista or Windows 7, select “Looking for Virtual PC 2007?” Download it. (You may have to jump through a few hoops like activation.) Download Windows XP and run it to extract the files. (It’s a 400MB download.) Open the “Windows XP.vmc” file – just double-clicking ought to work. At this point, you have a working Windows XP version. (The Administrator password is “Password1”.) Under Tools – Settings – Networking – Adapter 1, select “Shared Networking (NAT)” That’s pretty much it. You’ve got a Windows XP machine running inside your other Windows machine. ...

Lisp users would laugh, since they have macros, but Python supports some basic code inspection and modification. Consider the following pieces of code: margin = lambda v: 1 - v['cost'] / v['sales'] What if you wanted another function that lists all the dictionary indices used in the function? That is, you wanted to extract cost and sales? This is a real-life problem I encountered this morning. I have 100 functions, each defining a metric. For example, ...

When processing data at a large scale, there are two characteristics that make a huge difference to my life. Restartability. When something goes wrong, being able to continue from where it stopped. In my opinion, this is more important than parallelism. There’s nothing as depressing as having to start from scratch every time. Think of it as the ability to save a game as opposed to starting from Level 1 in every life. ...

In a number of sessions I’ve been to, people ask analysts to make their results more interesting – to tell stories with them. I’m co-teaching a course, part of which involves telling stories with data. So this got me thinking: what is a story? How does one teach storytelling to, let’s say, an alien? Consider this mini-paper. ABSTRACT: Meter readings exhibit spikes at slab boundaries. We also find significant evidence of improbably events at round numbers. Electricity shortage is a serious problem in most Indian states. Part of this problem is due to the inaccuracy of reporting procedures used in monitoring meter readings. Our focus here is not to document or experimentally determine the degree of inaccuracy. We have adopted a data driven approach to this problem and attempt to model the extent of inaccuracy using basic statistical analysis techniques such as histograms and the comparison of means. Our dataset comprises of the frequency analysis 12-month dataset containing monthly meter readings of 1.8 million customers in the State of Andhra Pradesh. We find that a histogram of these readings shows unexpectedly high values at the slab boundaries: 50 (+45.342%, t > 13.431), 100 (+55.134%, t > 16.384), 200 (+33.341%, t > 15.232), and 300 (+42.138%, t > 19.958). We also detected spikes at round numbers: 10 (+15.341%, t > 5.315), 20 (+18.576%, t > 6.152), 30 (+11.341%, t > 4.319). The statistical significance of every deviation listed above is over 99.9%. Further, every deviation has a positive mantissa. This leads us to confidently declare the existence of a systematic bias in the meter readings analysed. You’re probably thinking: “I know why he’s put this example here. It must be a bad one. So, what a rotten paper it must be!” ...

In reality, a colour is a combination of light waves with frequencies between 400-700THz, just like sound is a combination of sound waves with frequencies from 20-20000Hz. Just like mixing various pure notes produces a new sound, mixing various pure colours (like from a rainbow) produces new colours (like white, which isn’t on the rainbow.) Our eyes aren’t like our ears, though. They have 3 sensors that are triggered differently by different frequencies. The sensors roughly peak around red, green and blue. Roughly. ...

Until 2007, my blog was mostly just linking to stuff I found interesting on the Web. Since 2007, I’ve tried to write longer articles, mostly based on my own experiences. At the moment, that’s unsustainable. Right now, being in a startup, I doing more stuff than I ever have in the past. (That does not mean working more hours, by the way.) My posts, going forward, are likely to be smaller, less original, but hopefully more frequent. ...

Google’s Protocol Buffers is a “language-neutral, platform-neutral, extensible mechanism for serializing structured data – think XML, but smaller, faster, and simpler” XML is slow and large. There’s no doubting that. JSON’s my default alternative, though it’s a bit large. CSV’s ideal for tabular data, but ragged hierarchies are a bit difficult. I was trying to see if Protocol Buffers would be smaller and faster, at least when using Python. I took JSON as the base, and checked the write speed, read speed and file sizes. Here’s the comparison: ...

Turns out that you can use data URIs in the <audio> tag. Just upload an MP3 file to http://dataurl.net/#dataurlmaker and you’ll get a long string starting with data:audio/mp3;base64... Insert this into your HTML: <audio controls src=”data:audio/mp3;base64...”> That’s it – the entire MP3 file is embedded into your HTML page without requiring additional downloads. This takes a bit more bandwidth than the MP3, and won’t work on Internet Explorer. But for modern browsers, and small audio files, it reduces the overall load time – sort of like CSS sprites. ...

After a long break, here's another quiz, featuring relatively recent Tamil songs. Can you guess which movie they are from? Don't worry about the spelling. Just spell it like it sounds, and the box will turn green. Comments Rosario 23 May 2012 2:46 am: Right answers can be given along with the result. Nice pass-time for youngsters. Thank You for your services. Rosario sriram 22 May 2012 4:50 pm: after a long time… :) but what a poor memory i have…. 8/20. :(:(:(:( S Anand 21 May 2012 3:49 pm: @vrraghy: Fixed song 10. Thanks! Vinoth B 22 May 2012 3:02 pm: Interesting..! But couldn’t get many !! :-) Raghavan Rengachari (@vrraghy) 21 May 2012 2:44 pm: Just couldn’t get a few :| and song 10 isn’t working… thambidi 21 Jul 2012 9:17 pm: poor memory 07/20 priya 3 Jun 2012 1:26 pm: Nice..familiar song but could’t find all movie name Jayapal Chandran 23 May 2012 8:59 pm: It isn’t poor memory but it is the quality of the song which makes you listen to it again and again and eventually you will get well memorized in you. and i could get green only the songs which i knew very well… others i did not even try cause they never sounded good… or the song failed publicity in some way… kavilavu 16 Jun 2012 8:29 am: 11/20,…..we found it..nice job.. so interesting to play thanks kamlakrisnan 29 Oct 2012 3:51 pm: Hi i got 20/20, its very interesting to find the movie names. Niranjan 6 Dec 2012 3:00 pm: I got 20/20 at first try itself by identifying the song name immediately. But it was difficult to find movie names. I have listened to all these songs in music channels as well as in my car. But finding movie names was difficult for 3-4 songs. Vincent(Jv) 12 Oct 2012 4:29 am: i got 15/20 great work Thanks… radha 28 Sep 2012 8:17 am: hey….. i got 19/20, great work… thanks for your good work Sundar 21 Nov 2012 5:04 am: i think i’m the first to get all 20/20 songs, but very tough to find it. good job for the collections, many was out of memory as we hear new songs, afshin 23 Oct 2012 6:32 pm: wow!!!!!!!17/20,……… intersting!!!!!!!! Abi 31 Dec 2012 4:29 am: can’t find 8,10 and 20 Shiva 22 Nov 2012 2:38 pm: HEy Intersting!!!!! got 16/20. tough work :) Akila 12 Dec 2012 9:55 am: 14/20… where are the answers please? anusha 14 Mar 2013 3:06 pm: wow!!all 20 right!! :D Priya Krishnamoorthy 3 Feb 2013 8:09 am: 18/20. every thing is easy but except 2(i.e,13 & 16) sribala arun 25 Dec 2013 3:21 pm: i cant get 16 and then 14 is 7am arivu but it is showing not correct anu 24 Dec 2013 1:51 pm: i got 19/20 its interesting!!! deepika 21 Feb 2014 2:11 pm: i got 18/20 nice game Anusha 14 Dec 2013 8:35 pm: Woohoo!!! All 20 correct! ;) Anusha 14 Dec 2013 8:36 pm: Woohoo!!! All 20 are right! ;) hbqdb 27 Apr 2013 5:51 am: can’t find 10,14&17 anu 24 Dec 2013 1:55 pm: i got 19/20 nice!!! kumar 8 Apr 2014 3:40 pm: 17/20 Divya kd 14 Mar 2015 7:59 am: Wow I got 20/20 rviji 6 Dec 2014 8:23 pm: wow!!!!20/20 sowndharya 30 Apr 2018 8:10 pm: wow …..got 15 out of 20 ATR 9 Jun 2016 8:53 am: Got 20/20 but 7aam arivu is taking up as answer Sab 18 Apr 2020 7:05 pm: bad memory sankar 30 Dec 2015 8:52 am: could you forward the link to download this and answers for our own party game. hema 9 Jul 2016 8:31 am: semma i got 20/20 Akshaya 28 Nov 2018 12:15 pm: it was interesting revo 29 Sep 2016 10:20 am: nice quiz……..but where are the answers? ganga 17 Jun 2016 7:16 pm: i got ans for 17 and it’s very interesting Siva 8 May 2018 7:24 pm: Good adithiya 23 Apr 2017 1:16 pm: wow…sema but i cant find songs Meena 10 Apr 2020 4:59 pm: I found 17.. I know another 2 song.. but I can’t remember the lyrics.. the last one is very tough Priya 23 Sep 2019 7:06 pm: Wow I got it 18/20

The following article appeared in The Times of India earlier this month. The institute is struggling for funds. Please contribute, if you could, by calling +91 44 24985320 or via PayPal. Sanskrit centre struggles to stay alive The Kuppuswami Sastri Research Institute attached to the Sanskrit College in Mylapore is in doldrums because of lack of government patronage. The Institute, one of the three involved in Sanskrit research in the country, has been surviving on private donations. With not enough resources, the management is unable to pay the faculty the benefits of the sixth pay commission. Institute director V Kameswari said the Union government stopped its financial support in 1995, after which it has been solely dependent on donations. "The institute has a trove of rare palm leaf manuscripts and books not just about Sanskrit literature but also on architecture, fine arts, geography, history and astronomy in Sanskrit," says Kameswari. The two other such institutes are the R G Bandarkar Sanskrit Institute in Pune and the Ganganath Jha Sanskrit Institute in Allahabad. "We have requested a onetime grant from the Union planning commission and also annual assistance from the Rashtriya Sanskrit Sansthan, but are yet to get any support," says K S Balasubramanian, deputy director of the institute. The plan panel had given grants to the Mumbai Asiatic Society and Kolkata-based Asiatic Society. The institute was getting about 10 lakh till 1995 but due to a misunderstanding between the government-appointed members of the governing committee and the management, the aid was stopped. Today, there are 24 scholars at the institute, most of them women doing their PhDs. "Scholars from across the country and world visit the institute. We send out publications to many foreign universities and they in turn send their publications which are preserved here," says Kameswari. The institute was started as a private non-profit organisation in 1944 in memory of Kuppuswami Sastri, a renowned Sanskrit scholar. It has a library with books on astronomy, architecture, fine arts, mathematics, Vedas, Puranas, Upanishads and various branches of science. "A private entrepreneur made a donation with which we have air-conditioned the library. The palm-leaf manuscripts in the library are 600 to 1,000 years old. Many of them are in Grantha script. We also have books on Jainism that speak about solving mathematical equations and explain geographical concepts," says Kameswari, who is worried about keeping the ancient language alive. ...

Five years ago, I built a song search engine – mainly because I needed to listen to songs. Three years ago, I stopped updating it – mainly because I stopped listening to songs actively, and have been busy since. For those of you who have been using my site for music: my apologies. These days, I don’t really find the need to download music. YouTube has most of the songs I need. Bandwidth is pretty good too even when on the move. But when I do need to download music, this is my new workflow. ...

A question from Dorai get me thinking: does being good at maths help in programming? I don’t have a personal view. But since Reportbee has data on the Class 12 examination results for the last three years, we thought we could do a bit of analysis. Here’s the correlation of the scores of various subjects with Computer Science. Correlation Subject 0.79 CHEMISTRY 0.79 PHYSICS 0.75 ENGLISH 0.75 MATHEMATICS 0.72 LANGUAGE 0.67 BIOLOGY 0.66 ECONOMICS 0.66 COMMERCE 0.65 ACCOUNTANCY 0.56 HISTORY 0.52 GEOGRAPHY It almost breaks neatly into four groups. ...

Reading, wRiting and aRithmetic are the 3 ‘R’s that are taught at school. I was thinking about their relevance today. Reading continues to be relevant. The volume of information available today is more than before. So you need to read faster AND smarter. (If there was one good thing that came out of my IIM coaching classes, it was the ability to read fast, and making it subconscious.) But I wouldn’t say the same of writing. In the last 10 years, I have typed several hundred more pages than I’ve written. So have all my friends. ...

I’ve returned my laptop, and it’s time to buy a new one. For the first time in my life, I’m buying a laptop for myself. I have a fairly clear idea of what I want: a 500GB+ 7200 rpm hard disk with 4GB of RAM and an Intel Core i7. I thought that would make finding one of those powerful laptops for producing music since I record some stuff too out of hobby. Sheer naïveté. Not a single site let me filter by hard disk rpm in India. (To be fair, I haven’t found any sites outside India that did that either.) ...

I’m writing this post on a one-way flight from London back to India. I’ve moved on from Infosys Consulting, and am starting up on my own. I’ve wanted to do this for a long time. There’s always more freedom in your own company than someone else’s. There’s often more money in it too, if you’re lucky enough. But my upbringing is a bit too conservative to make that bold step. However, given that my father runs his own firm, I figured it was just a question of time for me to do the same. ...