R Basics

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R is a free software environment for statistical computing and graphics. The following is some basics about R data types.

Comparison of vector,list,matrix and dataframe

  vector list matrix dataframe
creation c list matrix data.frame
same type Y N Y N
class class of its elements list matrix data.frame
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How to burn videos longer than 2 hours on a DVD5

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Preamble

Three great virtues of a programmer; Laziness, Impatience and Hubris. – Larry Wall

  1. Laziness: The quality that makes you go to great effort to reduce overall energy expenditure. It makes you write labor-saving programs that other people will find useful and document what you wrote so you don’t have to answer so many questions about it.
  2. Impatience: The anger you feel when the computer is being lazy. This makes you write programs that don’t ...
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Use Your Computer as a Hotspot (Software Access Point) for Local Network

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I came across this script after a long struggle to set up a hotspot using my computer’s internet service, wired or wirelss. Create_ap script uses hostapd + dnsmasq + iptables to create a NATed Access Point OR hostapd + brctl + dhclient to create a bridged Access Point. The default behavior is a NATed Access Point,see here or github.

Requirement and Eligibility Check

You need a nl80211 compatible wireless device, which ...

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Installing LIRC on Raspberry PI 2B Running Raspbian

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Preamble

Here’s what you need to do in order to get LIRC working properly on Raspbian:

  1. Make sure you are running the version of Raspbian which has the LIRC modules included
  2. Install lirc from apt-get
  3. Add a couple of entries into the /etc/modules file
  4. Use dmesg to ensure the Lirc settings have loaded properly
  5. Run a system command to ensure the the device is reading the signals from the remote control
  6. Run an lirc program to record the IR ...
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