I installed a fresh Ubuntu 14.04 on an old MacAir (how to do that is explained here) and took me hours to get it to see the Wifi networks. There were many suggestions on many sites but the solution that finally worked for me was Hadaka’s answer from ubuntuforums

Just for information, check your pci id via

lspci -n | grep 0280

Then some cleaning up

sudo apt-get autoremove
sudo apt-get remove --purge bcmwl-kernel-source  #for good measure
sudo apt-get remove --purge b43-fwcutter firmware-b43-installer

sudo rm /var/lib/apt/lists/*
sudo rm /var/lib/dpkg/lock
sudo rm /var/cache/apt/archives/lock
sudo dpkg --configure -a

sudo apt-get update # I didn't do this as I didn't have a network

Now the important part is:

sudo apt-get install linux-firmware-nonfree

however, as I didn’t have a network I downloaded linux-firmware-nonfree_1.14ubuntu1_all.deb to a USB stick (you might want to get a newer version) from here to a connected computer and then

sudo dpkg -i linux-firmware-nonfree_1.14ubuntu1_all.deb

and then

sudo modprobe b43

Finally, rebooted and was able to see and connect to WiFi networks

This article exaplains how it is done for Ubuntu 12.04
Basically, just add your list of DNS name servers for eth0 in the /etc/network/interfaces file:

dns-nameservers X.X.X.X Y.Y.Y.Y Z.Z.Z.Z

and don’t forget to

sudo ifdown eth0 && sudo ifup eth0

A quick hack to update all the Cordova plugins used in a Cordova project. Next hack will be updating all Cordova platforms…

From the Cordova project run the following (unix shell required):

cordova plugins | grep -Eo '^[^ ]+' | while read line
do
    echo "cordova plugin remove $line"
    echo "cordova plugin add $line"
done

Obviously you should first download and install Doxygen

Next, you should download and install Graphviz which will install the dot tool

in a nutshell, you create the documentation by running:

doxygen my_conf_file

Where my_conf_file contains all the required parameters for the generated documentation. If you use the doxygen wizard from the UI, a configuration file will be generated with some default parameters, however you need to change the following parameters in the generated configuration file if you want caller and/or called function graphs to be generated:

HAVE_DOT               = YES
EXTRACT_ALL            = YES
EXTRACT_STATIC         = YES
CALL_GRAPH             = YES
CALLER_GRAPH           = YES
MAX_DOT_GRAPH_DEPTH    = 10

Note that if you use the above parameters on a non-trivial code base then the documentation generation might take a long time. Read the doxygen documentation to better understand the implications.

There really isn’t such a mathematical term – it was introduced at the latest Al Zimmermann’s Programming Contests and is defined in the contest rules (at azpcs.net – site should be back up around mid December January, a replacement is currently up at trdb.org ).

As I’m participating in this contest and have created some useful C++ classes to solve these types of optimisation problems I’ll be publishing them on github after cleaning them up when the contest is over (January 3rd).

Needed to convert a one dimensional array to a two dimensional numpy matrix and then add a row vector to the end of the matrix.

import numpy
array1d = range(10,100)
array2d = [array1d[i:i + 10] for i in range(0, len(array1d), 10)]
newline = [88 for i in range(1,11)]
m = numpy.matrix(array2d)
m_extended = numpy.vstack([m, newline])