Using fmincon to optimize Simulink model for optimal trajectory

Hello, so i want to search for optimal trajectory (by defining spline) position input to the Simulink Simscape Multibody model to minimize the total force input to the model. However, I encountered the following error in constraint function.

Error using chckxy
The first and second inputs must be of type double or single.

Error in spline (line 72)
[x,y,sizey,endslopes] = chckxy(x,y);

Error in GetStartedWithProblemBasedOptimizeLiveEditorTaskExample>constraintFcn (line 43)
    dataStructure.signals(1).values=spline(nTime,locX,dataStructure.time);

Besides form that, when I try to exclude the constraint, the solution of the optimal trajectory is always the same with the initial points. Can anyone help me with the situation? Hereby I attach the folder.

Answer 1

[Nipun]

Hi Joshua,

I understand that you want help with calculating how many hours of data fall within the current hour in MATLAB. Here is a concise approach to solve this:

% Sample data: timestamps as datetime array
timestamps = datetime(2024, 5, 30, randi([0, 23], [100, 1]), randi([0, 59], [100, 1]), randi([0, 59], [100, 1]));

% Current hour
currentHour = hour(datetime('now'));

% Extract hours from timestamps
dataHours = hour(timestamps);

% Count occurrences within the current hour
hoursInCurrentHour = sum(dataHours == currentHour);

disp(hoursInCurrentHour);

Replace timestamps with your actual data.

Hope this helps.

Regards,

Nipun