Derivatives in Embedded Matlab 1

[alrubaie]

Hi there,

In Simulink, I'm trying to differentiate a function with respect to a non-time variable. So I created an embedded matlab function and wrote down the following:

function phi = func(B)
syms x;
phi = diff(cosh(B*x)-cos(B*x)...),x);

This function works if called from Matlab console, but with Simulink it complains that "command duality is not supported". What's the way to do it then?

Thanks,
Hasan

 

[GregLocock]

Analytically solve your differential and then include that in your function. ie get rid of the diff and syms statements

Cheers

Greg Locock


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[alrubaie]

Hi Greg,

The function is way longer than what I typed above, that's why I put the ellipsis
I might be able to differentiate it this time, is there an easier way though?

Hasan

 

[alrubaie]

That was silly, never mind.
Thanks for the help.

 

[GregLocock]

I don't know. Perhaps mathworks support has a better solution. Have you looked through the functions allowed in embedded matlab for inspiration?

Cheers

Greg Locock


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