I wrote a script file in MATLAB that executes two functions as shown below:
function TempFunction()
fcn1();
fcn2();
end
After fcn1() is executed, I want the program to wait for execution of a model in Simulink, and then execute fcn2().
How can I do that?
One way to do this would be to use a Model Callback - set up a 'StopFcn' to trigger the next thing you want to run.
Alternatively, you could go into a loop polling the 'SimulationStatus' - see this page in the doc. .
you can call simulink models as functions from MATLAB as sim('Model_Name')
Read more about the options in the docs: https://uk.mathworks.com/help/simulink/ug/using-the-sim-command.html
and the sim function: https://uk.mathworks.com/help/simulink/slref/sim.html
Related
For the use case of being able to abort parallel simulations with a MATLAB GUI, I would like to stop all scheduled simulations after the user pressed the Stop button.
All simulations are submitted at once using the parsim command, hence something like a callback to my GUI variables (App Designer) would be the most preferable solution.
Approaches I have considered but were not exactly providing a desirable solution:
The Simulation Manager provides the functionality to close simulations using its own interface. If I only had the code its Stop button executes...
parsim uses the Simulink.SimulationInput class as input to run simulations, allowing to modify the preSimFcn at the beginning of each simulation. I have not found a way to "skip" the simulation at its initialization phase apart from intentionally throwing an error so far.
Thank you for your help!
Update 1: Using the preSimFcn to set the the termination time equal to the start time drastically reduces simulation time. But since the first step still is computed there has to be a better solution.
simin = simin.setModelParameter('StopTime',get_param(mdl,'StartTime'))
Update 2: Intentionally throwing an error executing the preSimFcn, for example by setting it to
simin = simin.setModelParameter('SimulationCommand','stop')
provides the shortest termination times for me so far. Though, it requires catching and identifying the error in the ErrorMessageof the Simulink.SimulationOutput object. As this is exactly the "ugly" implementation I wanted to avoid, the issue is still active.
If you are using 17b or later, parsim provides an option to 'RunInBackground'. It returns an array of Future objects.
F = parsim(in, 'RunInBackground', 'on')
Please note that is only available for parallel simulations. The Simulink.Simulation.Future object F provides a cancel method which will terminate the simulation. You can use the fetchOutputs methods to fetch the output from the simulation.
F.cancel();
I have the following question: How do I tell Matlab that it should not wait for the results of a function? Is there a way other than threads?
My problem: I have a function A that is called by a Timer every few seconds. If a specific event is met, another function B is called inside function A. Function B opens a Batch File.
I want function A to go on without waiting for function B to end. Is there a way to easily do it?
I'm sorry if this question was already asked, but I couldn't find a satisfying answer. Please also excuse my bad english.
I would like to thank everyone who answers for their help.
In your function B, just call the batch file with a & at the end of the line.
For example:
!mybatch.bat &
This will run the file mybatch.bat in background mode and will return execution to Matlab immediately after the call.
or if you prefer the complete form:
[status, result] = system('mybatch.bat &')
But in this case it is a bit useless, since the system call mybatch in the background, the result variable is always empty and status is always 0 (whether a file mybatch.bat was found and executed or not)
edit: That is the quick trick in case it is only the batch file execution which is slowing down your program.
If you have more matlab instructions in function B and you really need function A to go on without waiting, you will have to set up a listener object with function B as a callback. Then in your function A, trigger the event (which will activate the listener and call function B).
I'm running a simulation which is controlled by Matlab. The Matlab enters a loop and controls the simulation sequentially. Is it possible to change the variable value(e.g.. a flag) by user input during loop execution so that I can control the behaviour of the simulation in real time?
If you want to change the value based on some condition, then use can use the input command.
Another option is to create a small pushbutton and then write its callback. In the callback function, you can write input command and request user input. Use the method which suits your needs.
Is it possible in matlab to call a function when the program I'm running is idle? I don't want this to be a parallel process. Also, I would prefer a solution where I could pause and resume the function when the main program has to run again. Kind of like an interrupt in embedded systems, in my case the main program is the interrupt.
how would I do this?
you could use a timer object to start / stop the second function. see the matlab documentation. See also this mathworks blog entry.
I am trying to link an external app to a Simulink model and run the simulation step-by-step. In the model command description it says 'other MATLAB program-based tools to run a simulation step-by-step', what it does not say is how you do this.
The process looks to be:
compile model
then for each time step:
call outputs = model(t,x,u,'outputs');
call dstates = model(t,x,u,'update');
call derivs = model(t,x,u,'derivs');
What appears to be missing is the call to calculate the continuous states; does any one know how to do this?
There is no simple call for calculating continuous states.
You must write a code to calculate them.
More about that on this link:
http://www.mathworks.com/matlabcentral/answers/7267-what-is-the-best-way-to-execute-a-simulink-model-step-by-step-interactively-from-matlab
There is also a set of files with example.