Output type definition for extrinsic function (polyxpoly) in Simulink

Question

Rod 2013-8-16

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https://ww2.mathworks.cn/matlabcentral/answers/84917-output-type-definition-for-extrinsic-function-polyxpoly-in-simulink

评论： Sharan Duggirala 2015-4-17

Hi,

I'm needing to use an extrinsic function in an embedded matlab block in simulink (polyxpoly).

My problem is that the output of this function is an x by 2 array where x varies. I am therefore unable to define the output type without getting an mxarray error.

How can I make use of this function in a simulink matlab function block?

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Answer 1

Kaustubha Govind 2013-8-16

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https://ww2.mathworks.cn/matlabcentral/answers/84917-output-type-definition-for-extrinsic-function-polyxpoly-in-simulink#answer_94453

编辑：Kaustubha Govind 2013-8-16

在 MATLAB Online 中打开

Since the Embedded MATLAB block uses static memory allocation, it cannot handle variables that change size dynamically. What you can do is declare your output as variable-sized while specifying an upper bound for the size.

   function y = myfun(x)
   coder.varsize('y', [1024 2]); %x must never exceed 1024
   coder.extrinsic('polyxpoly');
   y = zeros(x, 2); %pre-declare the type and size of y
   y = polyxpoly(x, other_args, ...);