MATLAB: Do I get an MATLAB Function Interface error message when running a model with a MATLAB block in Simulink 7.7 (R2011a)

simulink

When I run a model with a MATLAB block, I get the following error message:

 MATLAB Function Interface Error: Error calling generated SFunction, untitled_sfun. Undefined function or method 'untitled_sfun' for input arguments of type 'double'.

Best Answer

This error message can occur if the model is stored in a directory that starts with the '+' or '@' character. Directories with those names are reserved for use with MATLAB packages and classes.

To work around this error message, move the .mdl model file to a directory that does not start with the '+' or '@' character.

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MATLAB: Do I get error messages when compiling a model that contains an S-function block that uses the external S-function module in Real-Time Workshop

This problem results from incorrect usage. The S-Function modules parameter should be used only to list source files. If an S-Function requires a specific library to be linked in, the full path to that library file should be specified via:

    Configuration parameters -> Real-Time Workshop -> Custom Code -> Libraries

or by using the rtwmakecfg.m API

Information about using the rtwmakecfg.m API can be found in this URL:

 <http://www.mathworks.com/help/releases/R2011a/toolbox/rtw/ug/bp67s_y-1.html#bp67trh>

MATLAB: How to integrate non-code generation capable functions into a MATLAB block in Simulink 7.7 (R2011a)

When you use EML.EXTRINSIC for a function, you instruct the Embedded MATLAB subset not to compile or generate code for that function, and instead the software dispatches these functions to MATLAB for execution. The key is to make code in the actual Embedded MATLAB block in the model a simple wrapper that calls a secondary .m file, and then to declare that entire secondary .m file to be extrinsic. Thus you avoid the general requirement that the code inside of the EML block needs to support code generation.

An example of this procedure can be seen in 'triscatteredinterp_simulink_good.mdl' attached to this solution.

Best Answer

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MATLAB: Do I get error messages when compiling a model that contains an S-function block that uses the external S-function module in Real-Time Workshop

MATLAB: How to integrate non-code generation capable functions into a MATLAB block in Simulink 7.7 (R2011a)

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