Fixed Point Tool not working with Matlab Function Block in Simulink

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Eike 2012-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/33008-fixed-point-tool-not-working-with-matlab-function-block-in-simulink

Hello everyone,

I have a rather simple model containing two Matlab function blocks with the following code:

function valueAtIndex = fcn(tappedDelays, index)
% Extracts the value of a vector signal at a specified index.
valueAtIndex = tappedDelays(index);

Now I'm trying to use the Simulink Fixed-Point Tool to derive an appropriate fixed-point representation of the model.

However, the Fixed-Point Advisor keeps telling me that my system contains blocks that do not support fixed-point data types and lists the MATLAB function blocks I mentioned above.

How can that be? In the Model Explorer, I can without any problems specify my function to take fixed-point arguments, therefore I'd say the error message is plain nonsense!

What I wanted to do is let the Fixed-Point Advisor propose optimal fixed-point types to me. Is there any possibility to have it do so?

Kind Regards and thanks in advance,

Eike

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Eike 2012-3-21

Also see my other question on the reason why I created such an embedded matlab function: http://www.mathworks.com/matlabcentral/answers/33009-simulink-block-to-extract-signal-at-index-from-vector-signal-doesn-t-exist

Eike 2012-3-21

And by the way, why is the search engine at MATLAB answers so bad? I always get loads and loads of results that have about nothing to do with my search terms.

Would be pretty nice if there was an update some day!

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