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Introduction

This assignment uses data from the <a href="http://archive.ics.uci.edu/ml/">UC Irvine Machine Learning Repository</a>, a popular repository for machine learning datasets. In particular, we will be using the "Individual household electric power consumption Data Set" which I have made available on the course web site:

The following descriptions of the 9 variables in the dataset are taken from the <a href="https://archive.ics.uci.edu/ml/datasets/Individual+household+electric+power+consumption">UCI web site</a>:

<ol> <li><b>Date</b>: Date in format dd/mm/yyyy </li> <li><b>Time</b>: time in format hh:mm:ss </li> <li><b>Global_active_power</b>: household global minute-averaged active power (in kilowatt) </li> <li><b>Global_reactive_power</b>: household global minute-averaged reactive power (in kilowatt) </li> <li><b>Voltage</b>: minute-averaged voltage (in volt) </li> <li><b>Global_intensity</b>: household global minute-averaged current intensity (in ampere) </li> <li><b>Sub_metering_1</b>: energy sub-metering No. 1 (in watt-hour of active energy). It corresponds to the kitchen, containing mainly a dishwasher, an oven and a microwave (hot plates are not electric but gas powered). </li> <li><b>Sub_metering_2</b>: energy sub-metering No. 2 (in watt-hour of active energy). It corresponds to the laundry room, containing a washing-machine, a tumble-drier, a refrigerator and a light. </li> <li><b>Sub_metering_3</b>: energy sub-metering No. 3 (in watt-hour of active energy). It corresponds to an electric water-heater and an air-conditioner.</li> </ol>

Loading the data

When loading the dataset into R, please consider the following:

Making Plots

Our overall goal here is simply to examine how household energy usage varies over a 2-day period in February, 2007. Your task is to reconstruct the following plots below, all of which were constructed using the base plotting system.

First you will need to fork and clone the following GitHub repository: https://github.com/rdpeng/ExData_Plotting1

For each plot you should

When you are finished with the assignment, push your git repository to GitHub so that the GitHub version of your repository is up to date. There should be four PNG files and four R code files.

The four plots that you will need to construct are shown below.

Plot 1

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Plot 2

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Plot 3

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Plot 4

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