Can I use Variable step solver with Matlab Function blocks inside a Simulink model?

MathWorks Support Team

2018 11 30

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 My questions revolve around -  Does Variable step solver work with Matlab Function block inside a Simulink model? Is the onus on the simulator or the function to "remember" that it's re-computing an intermediate time step?

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MathWorks Support Team 2018-11-30

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Yes, It is possible to use Variable step solver when the Simulink model includes a MATLAB Function block.

However the MATLAB Function block doesn't know that it is dealing with a variable time step solver because it only operates on the data at the current time step and does not depend on the previous time step. In other words MATLAB Function block only operates on the data one time step at a time. So the onus is not on the function to know that it is dealing with intermediate time steps.