ReadGT3XPlus.RdReadGT3XPlus reads the accelerometry data collected by ActiGraph GT3XPlus
in csv files generated by ActiLife software. It automatically parses the header
of the csv file to acquire the setting of the device.
ReadGT3XPlus(filename)
| filename | The name of the csv file. |
|---|
The ReadGT3XPlus returns an object of class "GT3XPlus".
This class of object is supported by functions computeActivityIndex.
A object of class "GT3XPlus" is a list containing at least the following components:
SN: Serial Number of the accelerometer
StartTime: Start time of the data collection
StartDate: Start date of the data collection
Epoch: The Epoch time of each observation. If sample rate Hertz>1, then Epoch=00:00:00
DownloadTime: Download time of the data
DownloadDate: Download date the data
Hertz: Sampling Rate
Raw: a data frame with 5 columns containing the date, time and acceleration in X, Y and Z axes
for each observation.
The function is tested on the csv files generated by ActiLife6, which have exactly 10 lines of headers, containing information about the device name, the starting and ending date/time of data collection, the sample rate, and the downloading date/time, etc. The 11th may further be omitted, if it is the header for the tri-axial acceleration time series. The function only reads the first 3 columns from then, if more are present.
filename = system.file("extdata","sample_GT3X+.csv.gz",package="ActivityIndex") res = ReadGT3XPlus(filename)