Why does the interpreted MATLAB function slow down simulink so much and how can I speed it up?

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Evan John 2018-2-6

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https://ww2.mathworks.cn/matlabcentral/answers/381134-why-does-the-interpreted-matlab-function-slow-down-simulink-so-much-and-how-can-i-speed-it-up

评论： Jan 2018-2-6

I have built a model in simulink that takes about 30 seconds to simulate ~600 seconds, which is good considering the number of ODE's in the model. However, I am now at a point where I need to include an additional piece of code that cannot be constructed in simulink. For this, I used the interpreted MATLAB function block. When I run the piece of code independent of simulink (as in, I just call it from the command window as you normally would), it takes <0.5 seconds to run. However, when I throw it into the interpreted MATLAB function block, it takes 15 minutes for it to run just 1 iteration of the MATLAB function. This is obviously too long considering how much time I am trying to simulate. What is the reason for this dramatic increase and how can I make it faster?

Thank you!