[log, timestamp]
= accellog(m)
returns the acceleration log, where m is the name of the
mobiledev object that acquires the sensor data,
log is an m-by-3 matrix containing
acceleration data points, and timestamp is an
m-by-1 vector of timestamps.
Get Logged Acceleration Data from Apple iOS Sensor
This example assumes that you have already installed
and set up MATLAB®
Mobile™ on your iOS device and connected it to your computer
running MATLAB. If you have not, see Install MATLAB Mobile on Your Apple iOS Device.
Start MATLAB
Mobile on your iOS device.
On the Sensors screen, tap the
Acceleration sensor.
Place the device where you want to get the sensor data.
On your computer, create a mobiledev object,
m, in MATLAB.
m = mobiledev
Begin logging data by enabling the Logging
property.
m.Logging = 1
This action starts the transmitting of data from all selected
sensors. You can also start transmission by tapping the
Start button in MATLAB
Mobile.
Get the logged acceleration data.
[a, t] = accellog(m)
This returns the acceleration log, where a
contains the three data points for the acceleration reading in
X, Y, and
Z coordinates, in m/s^2 (meters per second
squared).
See Device Orientation for a diagram showing the X,
Y, and Z axes relative to
the device.
log — Name of variable for acceleration log data m-by-3 matrix
Name of variable for acceleration log data, returned as an
m-by-3 matrix of data points from the
Acceleration sensor on the iOS device. The three data points are the
acceleration reading in X, Y,
and Z coordinates, in m/s^2 (meters per second
squared).
Acceleration is defined in relation to the X,
Y and Z axes. If you set
the device down face-up on a table, the positive X-axis extends out
of the right side of the device, positive Y-axis extends out of the
top side, and the positive Z-axis extends out of the front face of
the device. This is independent of the orientation of the
device.
timestamp — Name of variable for timestamp m-by-1 vector
Name of variable for timestamp, returned as an
m-by-1 vector of timestamps from the
Acceleration sensor on the iOS device. Time is in seconds, relative
to the InitialTimestamp property.
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