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Topic: Using piecewise-constant functions in ode Simulink
Replies: 1   Last Post: Feb 23, 2013 11:58 PM

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Phil Goddard

Posts: 358
Registered: 1/27/12
Re: Using piecewise-constant functions in ode Simulink
Posted: Feb 23, 2013 11:58 PM
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> I want to integrate the multiplication of a cosine with a
> piecewise-constant function (e.g. 1 from 0 to 1/1000, -1 from 1/1000 to
> 2/1000, ...)

Why don't you use a square wave that changes from 1 to -1 and back every thousandths of a second?

> y at t=3/1000 should be 8.00487e-4 if I solve analytically but Simulink
> has 8.29766161000261e-4 :( :(

That's not really a meaningful comparison.
Simulink is, by its nature, an approximation, and its accuracy depends not just on the problem, but also the solver and the solver parameters being used.


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