Unrecognized function or variable 'load_data_IMU_MATRIX'.
[developed function]: load_data_IMU_MATRIX
This file contains the help documentation necessary to correctly import data from an inertial sensor of the MATRIX range.
Table of Contents
Read a ".cvs file" (data format) generated by the MATRIX app. The MATRIX devices are IMU (Inertial Measurement Unit) sensors that measure accelerations, rotation speeds, body surface temperature, ambient temperature and heart rate.
The following are the main features of the smartwatch; provided by the manufacturer MATRIX:
1.- Syntax
2.- Description
[measurement]= load_data_IMU_MATRIX(file,idname) file is the name of the file, and idname an identifier of the data structure where the data will be stored.
The data structure that the function creates has the form:
As an example, the figure above shows the data recorded for acceleration.
3.- Examples
3.1.- Reading of captured data
% Reading a data file
[TestMeasurements] = load_data_IMU_MATRIX('MeasurementsIMU_MATRIX_MATA1002195.csv',1000,1030)
3.2.- Graphical representation of recorded data
% Representation of acceleration measurements (axis X, Y, Z)
acceleration_x = TestMeasurements.Accel(:,1); % Loading of acceleration data on the X-axis
acceleration_y = TestMeasurements.Accel(:,2); % Loading of acceleration data on the Y-axis
acceleration_z = TestMeasurements.Accel(:,3); % Loading of acceleration data on the Z-axis
figure % Creation of a new figure
% Acceleration in the x-axis
subplot(2,2,1) % Activation of the first figure
plot(acceleration_x, 'LineWidth',1.5) % Graphical representation of acceleration on the X-axis
xlabel('Sample number [-]') % Add label to the X-axis of the figure
ylabel('$a_x*g_x/100 [-]$','Interpreter','latex','FontSize',13) % Add label to the Y-axis of the figure
grid on % Grid activation in the graphic display
title('Representation of a_x') % Inclusion of title in the figure
yline(mean(acceleration_x),'r--','LineWidth',1.5) % Represent average value of ax
legend('a_x', 'mean(a_x)', 'Location', 'southwest') % Incorporation of a legend to the layout graphics
% Acceleration in the y-axis
subplot(2,2,2) % Activation of the second figure
plot(acceleration_y, 'LineWidth',1.5) % Graphical representation of acceleration on the Y-axis
xlabel('Sample number [-]') % Add label to the X-axis of the figure
ylabel('$a_y*g_y/100 [-]$','Interpreter','latex','FontSize',13) % Add label to the Y-axis of the figure
grid on % Grid activation in the graphic display
title('Representation of a_y') % Inclusion of title in the figure
yline(mean(acceleration_y),'r--','LineWidth',1.5) % Represent average value of ay
legend('a_y', 'mean(a_y)', 'Location', 'southwest') % Incorporation of a legend to the layout graphics
% Acceleration in the z-axis
subplot(2,2,[3,4]) % Activation of the third and fourth figure
plot(acceleration_z, 'LineWidth',1.5) % Graphical representation of acceleration on the Z-axis
xlabel('Sample number [-]') % Add label to the X-axis of the figure
ylabel('$a_z*g_z/100 [-]$','Interpreter','latex','FontSize',13) % Add label to the Y-axis of the figure
grid on % Grid activation in the graphic display
title('Representation of a_z') % Inclusion of title in the figure
yline(mean(acceleration_z),'r--','LineWidth',1.5) % Represent average value of az
legend('a_z', 'mean(a_z)', 'Location', 'northeast') % Incorporation of a legend to the layout graphics
% Representation of measurements associated with gyroscopes (axis X, Y, Z)
gyroscope_x = TestMeasurements.Gyro(:,1); % Loading of gyroscope data on the X-axis
gyroscope_y = TestMeasurements.Gyro(:,2); % Loading of gyroscope data on the Y-axis
gyroscope_z = TestMeasurements.Gyro(:,3); % Loading of gyroscope data on the Z-axis
figure % Creation of a new figure
% Rotation in the x-axis
subplot(2,2,1) % Activation of the first figure
plot(gyroscope_x, 'LineWidth',1.5) % Graphical representation of rotation on the X-axis
xlabel('Sample number [-]') % Add label to the X-axis of the figure
ylabel('$\alpha [degrees]$','Interpreter','latex','FontSize',14) % Add label to the Y-axis of the figure
grid on % Grid activation in the graphic display
title('Rotation alpha. X - axis') % Inclusion of title in the figure
yline(mean(gyroscope_x),'r--','LineWidth',1.5) % Represent average value of gyroscope_x
legend('gyr_x', 'mean(gyr_x)', 'Location', 'southeast') % Incorporation of a legend to the layout graphics
% Rotation in the y-axis
subplot(2,2,2) % Activation of the second figure
plot(gyroscope_y, 'LineWidth',1.5) % Graphical representation of rotation on the Y-axis
xlabel('Sample number [-]') % Add label to the X-axis of the figure
ylabel('$\beta [degrees]$','Interpreter','latex','FontSize',14) % Add label to the Y-axis of the figure
grid on % Grid activation in the graphic display
title('Rotation beta. Y - axis') % Inclusion of title in the figure
yline(mean(gyroscope_y),'r--','LineWidth',1.5) % Represent average value of gyroscope_y
legend('gyr_y', 'mean(gyr_y)', 'Location', 'northwest') % Incorporation of a legend to the layout graphics
% Rotation in the z-axis
subplot(2,2,[3,4]) % Activation of the third and fourth figure
plot(gyroscope_z, 'LineWidth',1.5) % Graphical representation of rotation on the Z-axis
xlabel('Sample number [-]') % Add label to the X-axis of the figure
ylabel('$\gamma [degrees]$','Interpreter','latex','FontSize',14) % Add label to the Y-axis of the figure
grid on % Grid activation in the graphic display
title('Rotation gamma. Z - axis') % Inclusion of title in the figure
yline(mean(gyroscope_z),'r--','LineWidth',1.5) % Represent average value of gyroscope_z
legend('gyr_z', 'mean(gyr_z)', 'Location', 'southeast') % Incorporation of a legend to the layout graphics
Date of last modification: 17/03/2023. SiMuR. EPI de Gijón. University of Oviedo.
Student: Alejandro Castellanos Alonso