Course Project for Getting and Cleaning Data
The origin data is already placed in the directory named data. Make sure to setwd() to current directory.
If the setting is correct, run the run_analysis.R script you will get the following files:
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data_extract.txt extracted the features with names containing either "mean()" or "std()" from both the training set and the test set. It's also labeled with human-readable activity.
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data_average.txt contains the same variables as data_extract.txt, plus a column named "subject" indicating from whom the data was collected. Unlike data_extract.txt, each row in this file is the average value, grouped by the specific subject id and activity.