I am currently working on an S-Function in Simulink, and I encountered the following error:

Error: Cannot initialize the width of data type work vector 1 of 'untitled/S-Function'. The data type work vector width is set to dynamically sized (-1). Initialize the data type work vector width in mdlInitializeSizes or mdlSetWorkWidths.

I understand that the issue is related to initializing the width of the data type work vector. However, I am unsure about the steps to resolve this error. Could you please provide guidance on how to initialize the data type work vector width in either mdlInitializeSizes or mdlSetWorkWidths?

Answer 1

[Ayush Singh]

Hi Ahraz

In order to initialize the width of data type work vector using mdlInitializeSizes try adding this code

static void mdlInitializeSizes(SimStruct *S) 
{ 
   % Add mdlInitializeSizes code here *
    % Register the number of DWork vectors
    ssSetNumDWork(S, 1); % This sets the number of DWork vectors to 1
    
     % Set the width of the first (and only) DWork vector
    ssSetDWorkWidth(S, 0, 10); % This sets the width of the first DWork vector to 10
} 

Here 'S' is SimStruct representing an S-Function block.

For more information on 'mdlInitializeSizes' , 'ssSetNumDWork' and 'ssSetDWorkWidth' refer to following links:

https://www.mathworks.com/help/simulink/sfg/mdlinitializesizes.html

https://www.mathworks.com/help/simulink/sfg/sssetnumdwork.html

https://www.mathworks.com/help/simulink/sfg/sssetdworkwidth.html

I hope the above information helps!