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How to use max inside Simulink Fcn block?

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rotton
rotton on 24 Sep 2019
Commented: rotton on 24 Sep 2019
In my Simulink sheet, I have a Fcn block which does a very simple calculation from its input:
u(36)/u(38)*u(39)
Since the input can sometimes assume (unphysical) negative values, I wanted to exlude them:
max(0, u(36)/u(38)*u(39))
But as soon as I call the simulation, I get
The expression: max(0, u(36)/u(38)*u(39))
in '.../.../...'
has a syntax error
So does that mean that max is undefined inside Fcn blocks? If so, what could I use instead?
  2 Comments
rotton
rotton on 24 Sep 2019
> Just to confirm are you referring this block?: Fcn
Yes, indeed. I also noticed that the max function is not part of the list of available (mathematical) functions.

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Accepted Answer

Walter Roberson
Walter Roberson on 24 Sep 2019
Math Function Blocks https://www.mathworks.com/help/simulink/slref/mathfunction.html do not accept expressions: they only accept keywords.
You can build max() against a constant with https://www.mathworks.com/help/simulink/slref/minmax.html or with Saturate blocks.

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