Reset reading from .mat file

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Hi everyone, I'm Luca and I have a problem with a model in Simulink. I'm using a From File block to loading a motion law in my model (motion law is made with Matlab function and sampled with ts=0.00025, saved in prova_ldm.mat). I set the simulation time the same as the period of the motion law and everything works well; when the loading is finished there's the possibility to maintain the previous value or ground value. Sometimes during the simulation I need to "restart" the From File block in order to obtain the data (starting from time=0 seconds) from prova_ldm.mat file. How can I do to obtain this?

P.S: I'll use this model with Simulink Real Time.

Thank you so much,

Luca