Steps to execute the exercise

• Download the data from this link to a folder https://d396qusza40orc.cloudfront.net/getdata%2Fprojectfiles%2FUCI%20HAR%20Dataset.zip

• Create folder c:/temp in your hard drive.

• Unzip the file to c:/temp. A folder Named 'UCI HAR Dataset' will be created. Under this folder, two subfolders will be created.

• The R script is using functions that need plyr R package. Be sure plyr is installed.

• Copy/Paste the content of run_analysis.R into R studio command line. This will create run_analysis function

• Because the function will return a dataset, Run the function by command like d <- run_analysis()

• Verify class of d by class(d)

• To get a sense of dataset and its contents, Run commands like:

  nrow(d)

  ncol(d)

  summary(d)

  colnames(d)

  str(d)

Logic behind run_analysis function

In run_analysis.R , There are comments for each command used in function that makes understanding the code easy to follow.