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Simulink/Matlab diference

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Cosmin Darab
Cosmin Darab on 6 Oct 2011
Hy Is there a way that I can use roots in simulink and get the same result as in matlab? Does simulink use a different compiler than matlab?(I use roots in a matlab embaded function in simulink and get different results than in matlab). Thank you.
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Titus Edelhofer
Titus Edelhofer on 6 Oct 2011
Hi Cosmin,
are the differences large (i.e., not "just" roundoff?). What results do you get?
Titus
Cosmin Darab
Cosmin Darab on 7 Oct 2011
Hi,
The results are almous the same but the last zecimals don't assembly(eg.0.001235876 and 0.001235012) but I use this numbers in an logarithm and the resuls are way different.
Thank You

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Accepted Answer

Walter Roberson
Walter Roberson on 6 Oct 2011
Simulink uses a different algorithm, and is documented as possibly returning the roots in a different order. So sort() the complex numbers and you should be fine to within roundoff limits (unless the polynomial was badly scaled.)

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