The script run_analysis.R does the following steps
- Download the data from https://d396qusza40orc.cloudfront.net/getdata%2Fprojectfiles%2FUCI%20HAR%20Dataset.zip
- unpacking the raw datafile
- loading all data to R
- tidying up the data
- export the tidy data set to the file: tidy_data.txt
In Order to run this script, you need the library plyr installed