The data from the following URL should be unzipped in this directory.

https://d396qusza40orc.cloudfront.net/getdata%2Fprojectfiles%2FUCI%20HAR%20Dataset.zip

So the folder structure of the current directory should look something like

/test

/train

activity_labels.txt

features.txt

features_info.txt

README.txt

run_analysis.R contains the script that first reads all the data from the train and test directory and merges them.