MATLAB: How to enable support for variable-size data in Simulink 7.7 (R2011a)

simulink

When I implement embedded MATLAB code in my Simulink model, I get the following error message:

 The coder.varsize() built-in function can only be used when support for dynamic matrix is turned on

I would like to know how I can enable the ability to support dynamic matrices.

Best Answer

The support for dynamic matrices could be enabled by checking the option"Support Variable-Size Arrays" in Model Explorer.

Please refer to the section "Enabling Support for Variable-Size Data" in the following location:

http://www.mathworks.com/help/releases/R2011b/toolbox/simulink/ug/br9_55w.html

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MATLAB: Where can I find documentation on the SS_OPTION_SUPPORTS_ALIAS_DATA_TYPES S-function option in Simulink 6.0 (R14)

This enhancement has been incorporated in Release 2006a (R2006a). For previous product releases, read below for any possible workarounds:

Information about the S-function option SS_OPTION_SUPPORTS_ALIAS_DATA_TYPES is missing from the Simulink documentation. Here is additional information about this option:

Use the SS_OPTION_SUPPORTS_ALIAS_DATA_TYPES option with ssSetOptions to specify how the S-function handles signals whose data types are aliases (see Simulink.Aliastype in the Simulink Reference for more information about data type aliases). If this option is set and the S-function's inputs and outputs use data type aliases, SimStruct macros such as ssGetInputPortDataType and ssGetOutputPortDataType return the data type IDs of those aliases. However, if this option is not set, the SimStruct macros return the data type IDs associated with the equivalent built-in data types instead.

MATLAB: Embeded MATLAB function variable-size signal

You can add calls to ASSERT which effectively bounds the values arguments:

 function y = fcn(u)
 %#codegen
 N = 10000;
 coder.varsize('y', [1 N]);
 assert(u < N);
 y = zeros(1, u);

should do the trick.

The error is effectively complaining about computing the size for the expression:

 zeros(1, u);

Which, provided the information given it must assume is unbounded.

You can reference:

http://www.mathworks.com/help/simulink/ug/variable-size-data-when-dynamic-memory-allocation-is-disabled.html#br9t1u3

for more documentation on this approach.

Best Answer

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MATLAB: Where can I find documentation on the SS_OPTION_​SUPPORTS_A​LIAS_DATA_​TYPES S-function option in Simulink 6.0 (R14)

MATLAB: Embeded MATLAB function variable-size signal

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