solver for digital systems

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Owen
Owen 2012-12-9
Hi,
is it better to set Solver to "discrete (no continuous states)" for digital systems?
Thanks Senmeis

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Azzi Abdelmalek
Azzi Abdelmalek 2012-12-9
When I work with digital system, I prefer set solver to discrete with fixed step. Now If you don't set a solver to discrete, and your system don't contain any continuous state, when you run your model, Matlab will set automatically the solver to variable discrete solver.
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Owen
Owen 2012-12-10
I have owen problems with fixed step. There is upsampling in my digital system so if fixed step is set I get more data than usual. Does this mean only variable step can be set for my case?
Senmeis
Azzi Abdelmalek
Azzi Abdelmalek 2012-12-10
If your sample time is varying, then you can work with variable discrete step. In your blocks that requires sample time, set it to -1 (Inherited), usually, it's the default setting. If your model don't contain any continuous state, set your solver to discrete, to avoid error message, because Matlab, like I said, will set it automatically.

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