##Getting and Cleaning Data Course Project
This file does the following steps on datasets
- Merges the training and the test sets to create one data set.
- Extracts only the measurements on the mean and standard deviation for each measurement.
- Uses descriptive activity names to name the activities in the data set
- Appropriately labels the data set with descriptive activity names.
- Creates a second, independent tidy data set with the average of each variable for each activity and each subject.
- this scrips needs data.table and reshape2 packages
- datasets must be in a folder named 'UCI HAR Dataset' the working directory
- run the script via command line or gui
- this function makes the tidy data in a file named 'tidy_data.txt' in the working directory