Simulink/Matlab diference

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Cosmin Darab 2011-10-6

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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 2011-10-6

Hi Cosmin,

are the differences large (i.e., not "just" roundoff?). What results do you get?

Titus

Cosmin Darab 2011-10-7

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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Answer 1

Walter Roberson 2011-10-6

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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.)