Hi Luis,
From what I understand, the code you provided includes the “pulsewidth” function, which is used to shift the data so that it aligns correctly for plotting. However, you mentioned that removing the “pulsewidth” function causes the size of the “sensor_data” matrix to change, leading to an error when plotting the data. The error message suggests that the size mismatch between the “sensor_data” and “instron_data” arrays is causing an issue when trying to plot them together.
Instead of relying on the “pulsewidth” function, you can manually find the shift between the two datasets based on a specific criterion. Assuming if the maximum value in “sensor_data” corresponds to the start of the alignment. Here’s an example of how you can modify your code to manually align the datasets without using “pulsewidth”:
% Import the data
for k = 1:size(files)
TestSensor = readtable(files(k,1), opts);
TestInstron = readtable(files(k,2), opts_instron);
% Transfer the table data to the array
sensor_data = table2array(TestSensor(2:height(TestSensor), :));
instron_data = table2array(TestInstron(2:height(TestInstron), :));
% Find the shift or alignment between the datasets
[~, max_index] = max(sensor_data(:, 3)); % Find the index of the maximum value in sensor_data
% Calculate the shift based on the desired criterion
shift = sensor_data(max_index, 1) - instron_data(1, 1);
% Plot the data with the calculated shift
plot(sensor_data(:, 1) - shift, sensor_data(:, 3), 'LineWidth', 1.5, 'Color', [0.267, 0.447, 0.769]) % Pulling Force
hold on
plot(instron_data(:, 1), instron_data(:, 3), 'LineWidth', 1.5, 'Color', [0.929, 0.490, 0.192]) % Normal Force
legend('Normal Force', 'Pulling Force', 'Friction*1000')
grid on
title(NamedGraphTitle)
xlabel('Time (s)')
ylabel('Force (lbs)')
axis([12.5, TimeendX, 0, 7500])
hold off
end
In this modified code, we find the index of the maximum value in the “sensor_data” array and calculate the shift as the difference between the maximum value's time and the first time in the “instron_data” array. This shift is then used to align the x-axis values of the two datasets when plotting.
Attached below are some documentation links that you may find helpful:
- Maximum elements of array - MATLAB max (mathworks.com)
- Array Indexing - MATLAB & Simulink (mathworks.com) (Indexing and slicing)
Hope this helps!
Karan Singh Khati
