allmargin function giving different results between 2013b and 2012a
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I am running a script using linmod() and ss() to get the state space representation of a Simulink model. Then, I am using the allmargin() function on the system to determine the margins. However, I get different margins when I use Matlab2013b when compared to Matlab2012a. I've double checked that my script and Simulink models used between the versions are the same. Can someone please shed some insight on why this may be the case?
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Craig
2014-3-13
There are usually small differences between release to release with changes to BLAS and improvements in scaling algorithms to improve numerical accuracy. One thing would be to look at in your frequency reponse particularly at the 0db and -180deg. Is the response steep at these locations? If they are then the value would be more sensitive to small variations at these locations.
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