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Topic: Simulink evaluation of (a<b) ? (a*a/b) : b
Replies: 6   Last Post: Apr 17, 2012 4:35 PM

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Jason S

Posts: 57
Registered: 2/23/05
Re: Simulink evaluation of (a<b) ? (a*a/b) : b
Posted: Apr 17, 2012 3:04 PM
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> I "know nuthink" about Simulink per se, but why not just special case
> b==0, too?


I can't special-case anything without using a conditionally-executing subsystem (I don't want to go there... if you care, see http://www.mathworks.com/help/toolbox/simulink/slref/if.html) or a MATLAB function evaluation (slow). It's not just a matter of simply doing an "if" statement. I can use min() and max() because they are predefined functions with no branches (or rather, the branches are taken care of inside the blocks).

> I presume a>=0 must also be a reqm't or the branch a^2/b could be taken
> for b=0 legitimately...


Yes, a and b are both within the range [0,1] inclusive.



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