Numpy Exceptions

To print all warnings in numpy do the following

import numpy as np
np.seterr(all='print')

This will print all warnings to stderr.

You can also make warnings to exceptions.
An example is shown below. The documentation is here.

import numpy

numpy.seterr(all='raise')

s = 10000.0

try:
    x = numpy.exp(s)
    print x
except:
    print "That is too big!"

How to change Figure and Table captions in LaTex

Usually figures and tables in LaTex get captions such as Figure 1 or Table 1. We can change these to other names as follows.

\renewcommand{\figurename}{Fig.}

OR to Japanese captions such as (with jarticle class)


¥renewcommand{¥figurename}{図}
¥renewcommand{¥tablename}{表}

2010 MacBook Air fan speed issue

After copying my data from the 15inch MBP to my new MBA, I found that the fan runs at full speed irrespective of what processes are running. So I decided to reset the System Management Controller (SMC) and this actually helped.

What you must do is switch off MBA while it is still plugged in to the power adapter and press
ctrl+option+shift and the power button (top left corner) just once. The light on the power adapter will
turn into green and after couple of seconds back to orange. Now switch the machine on.

Further info is here

Spectral graph theory

Spectral graph theory

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Transfer learning for collective link prediction

Transfer learningforclp

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Compressing and Decompressing Files

To decompress tar.gz (tgz) do (tar combines multiple files in a directory to a single file and gz compresses it)

• tar xzvf filename

To compress to tar.gz do

• tar czvf filename.tgz directory/

To decompress bz2 files do

• bunzip2 filename.bz2
• if it is tar.bz2 then do tar -xjvf filename.tar.bz2

To compress into tar.bz2 do

• tar cjvf filename.tar.bz2 directory/

How to link external libraries in C/C++

If you want to link /usr/local/lib/liblbfgs.so and compile quadratic.cpp then you have several options.
(include libbfgs.h in quadratic.cpp first)
g++  -Wall quadratic.cpp /usr/local/lib/liblbfgs.so -o quadratic

Or if this library is on your LD_LIBRARY_PATH, then you can simply do the following
g++ -Wall quadratic -llbfgs -o quadratic