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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Defective Products and a Nightmarish Experience with Lumber Liquidators

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last updated: {php}06/09/2016-10:27:13 AM{/php}

Summary

We have purchased over $9000 worth of Bolivian Rosewood and the tools necessary for installation. After I took my time off work and finished a small room of 100 sq ft, we found out that the rest of wood was not packaged correctly and had various damages and scratches. We spent a good amount of money for genuine rosewood molding and stairnose, but it turned out to be ...

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PDF Annotation Related Tools

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PDF Tools

After a long search (see session below), I came across this tool for PDF annotation. PDF Tools is a DocView replacement for pdf on steroids. It renders pdf files in memory on demand, thus allows much extended capabilities, such as annotation, search and lots more just like another org file. See it in action here or my screen cast.

Installation

  1. Install pdf-tools ...

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