How can I save live recorded data from force platforms in Matlab?

Hi, I'm having problems trying to save incoming data in Matlab.

The code I'm using is the AMTI Matlab test framework. This code uses an interactive GUI to initialize and start/stop the force platformes and also a live plot of the data that is being recorded.

The collection data part of the code tells you to modify it to your own needs and it gives you the code to record a simple point as following:

%Record a single point of the selected amplifier/plate
DataHandler.Sample=dataArray(DataHandler.AmpOffset+2:DataHandler.AmpOffset+7);

So I would like to know how can i save all the data in a single array.

Answer 1

[Karan Singh]

Hi Marc,

From what I understand, the goal is to save all the incoming data in a single array. For this you can initialize an empty array before starting the data collection loop. Then, within the loop, append each recorded point to the array.

Here's an example of how you can modify the code to achieve this:

% Initialize an empty array to store the recorded data 
recordedData = []; 

% Start the data collection loop 
while (collectData) 
    % Record a single point of the selected amplifier/plate 
    singlePoint = dataArray(DataHandler.AmpOffset+2:DataHandler.AmpOffset+7); 
    
    % Append the recorded point to the array 
    recordedData = [recordedData; singlePoint]; 
    
    % Additional code for processing or plotting the data can be added here 
    
    % Check for the stop condition and break the loop if necessary 
    if (stopCondition) 
        break; 
    end 
end 

% Save the recorded data to a file (optional) 
save('recorded_data.mat', 'recordedData'); 

In this example, the “recordedData” array is initialized as an empty array before the data collection loop. Inside the loop, each recorded point is stored in the “singlePoint” variable, and then appended to the “recordedData” array using the concatenation operation “[recordedData; singlePoint]”. Finally, you can save the recorded data to a file using the “save” function if desired.

Attached below are some documentation links that you may find helpful:

• Matrices and Arrays - MATLAB & Simulink (mathworks.com)
• Loop Control Statements - MATLAB & Simulink (mathworks.com)
• Low-Level File I/O - MATLAB & Simulink (mathworks.com)

Hope this helps!

Karan Singh Khati