Most efficient Quadratic Implementation in Simulink

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Tom 2012-9-13

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Hi,

A general question that comes up occasionally at work is; What is the best way to implement a simple equation in Simulink?

For example, if I need to implement a quadratic equation, am I best doing this using a number of gains, product and add blocks separately, using a dedicated block like the polynomial, or using a fcn (or even Matlab fcn) block?

I generally make the decision based on other factors such as clarity and ease of use, but is there an optimal solution for fastest simulations, or do they compile down to be identical anyway?

Regards, Tom

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Answer 1

Ryan G 2012-9-13

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You can see a number of the optimizations that are performed in the Configuration Parameters -> Optimizations tab.

For modeling anything I would avoid using a MATLAB Fcn block as this will limit your ability to utilize things that involve code generation (this includes accelerator/rapid accelerator).

Unfortunately I do not believe there is an easy answer for the general questions posed. It really depends on what you are modeling, what your goals are and the effects of Simulink optimizations such as block reduction.

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Tom 2012-9-13

Thanks, I guess the best way to answer this would be to look at RTW generated code, but I imagine the block reduction would make them all pretty similar as long as I'm careful.

Ryan G 2012-9-14

The block reduction is actually a Simulink optimization. There are more optimizations when generating code and there are even more optimizations that take place when it is compiled. Depending on your goals you may not want all of them.

For example if you are compiling the model over and over (making changes between runs/code generation) then you may want to minimize the optimizations that are performed. Once you solidify your model/controller you may want to use more optimizations to improve the performance of the compiled code.

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