Is there a MATLAB simulation time command supported by Simulink Design Verifier?

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Joshua
Joshua 2024-10-17
回答： TED MOSBY 2024-10-19
I am working on a Simulink model with a MATLAB Function block. The function in the function block requires the current simulation time. At the moment this is solved via an input with a Digital Clock block.
Is there a MATLAB command that could do this and is compatible with the Simulink Design Verifier?
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Pat Canny
Pat Canny 2024-10-18
Hi @Joshua,
I got several options from some internal experts:
  • To get the simulation time at the MATLAB prompt: "get_param(bdroot,'SimulationTime')"
  • To get the simulation time inside a MATLAB System block: matlab.system.getcurrenttime
  • To get the simulation time inside a Stateflow chart (MATLAB action language): getSimulationTime();
  • To get the simulation time inside a MATLAB Function block: we don't think there is a function for that. If the block is fixed-step discrete, the recommendation is to take the sample time as a parameter and count the time in the code.
Hopefully that helps. If so, let me know and I can submit this as an Answer.

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TED MOSBY
TED MOSBY 2024-10-19
Hi @Joshua,
In a MATLAB Function block in Simulink, you can access the current simulation time without needing a “Digital Clock” block. You can do this by passing the simulation time as an input to your function.
Add a Clock Block:
  • In your Simulink model, add a “Clock” block from the Simulink library (found under Sources).
Connect the Clock Block:
  • Connect the output of the “Clock” block to the input of your MATLAB Function block. This will pass the current simulation time to the function.
Define the MATLAB Function:
  • Edit your MATLAB Function block to accept the simulation time as an input. Here’s an example of how to define your function:
function output = myFunction(time)
% Use the current simulation time
currentTime = time;
% Example operation using current time
output = currentTime^2; % Replace with your desired computation
end
Hope this helps!
Here is the documentation for the “clock block”:
www.mathworks.com/help/simulink/slref/clock.html?searchHighlight=clock%20block&s_tid=srchtitle_support_results_1_clock%20block

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