This repository contains the solution to the first assignment of the Exploratory Data Analysis class: Making Plots with the base R plotting system. The repository has been created by clonning @rdpeng/ExData_Plotting1. The original README.md file has been renamed to original.repo.README.md Following is a brief description of the files contained in the repository:

• README.md - this file
• original.repo.README.md - the assignment specification (original README.md)
• plot1.R ... plot4.R - R scripts that generate the plots in the files plot1.png..plot4.png
• plot1.png ... plot4.png - image files in PNG format containing the required R plots
• figure - folder (from the original repository) containing the reference image files for the R plots (in PNG format)

Each R script (plot1.R ... plot4.R) performs the following tasks:

• read the raw data file ("household_power_consumprion.txt") in a data frame
• merge the first two columns - "Date" and "Time" in a single column and convert it from "character" to "POSIXct" type
• discard all the rows in the data frame except those which have the value of the first column ("Date_Time") in the interval [Feb/01/2007 00:00:00, Feb/02/2007 23:59:59]
• set png(filename="plotx.png", bg="transparent") as the current graphics device where x is the plot number corresponding to the R script
• generate the required plot using the base R plotting system by calling hist(), plot() and lines() functions (as needed)

The steps have been described in the comments in each R script as well. The repository doesn't contain the raw data file (household_power_consumption.txt). If you would like to try to run the R scripts, download the scripts from this repository and the raw data file from the URL provided in the assignment specifications and then source the R scripts in R/RStudio console

For the description of the raw data please read the original.repo.README.md file.

The image files have been generated with the same background as the reference plots - transparent (the alpha-channel of the PNG files is set to 0).
The only difference between the images generated by the R scripts and the reference images is the size of the image. Reference files have a size of 504 x 504 pixels while the files generated by the R scripts have a size of 480 x 480 pixels, as required by the assignment specifications.

Here are the four plots: