MATLAB: Data store memory(DSM)

Question

Hello

I am using Data store memory block in my simulink model to initialize a variable(array) to use in a matlab function block.Its a big model with tight tolerances. When I run I see that the DSM block looks into the full array(variable is size 50) at every time step so basically the simulation is EXTREMELY SLOW. How can I get rid of this.

Thank you

James

Answer 1

Hi James,

Looking through all the warnings, it appears from the diagnostics that the MATLAB Fcn block is running at minor times steps (the model has continuous states or you have chosen a continuous state solver) and obviously the block is storing values at all time steps (including minor time steps). I don't think the DSM block has anything to do with this apart from providing the diagnostics. These write after write diagnostics are to make sure that this is what you intended to do and are not an error by themselves. Currently, the way you have modeled is making the block write to elements at all minor time steps. Could you change the solver type (say to discrete if your model doesnt have continuous states) and see if minor steps go away? This will also have a significant improvement in performance, which was your original issue.

-Nirmal