Specify the sizes of the work vectors and create the run-time parameters required by this C MEX S-function
No
C, C++
#define MDL_SET_WORK_WIDTHS
void mdlSetWorkWidths(SimStruct *S)
S SimStruct representing an S-Function block.
The Simulink® engine calls this optional method to enable
this S-function to set the sizes of state and work vectors that it
needs to store global data and to create run-time parameters (see Create and Update S-Function Run-Time Parameters).
The engine invokes this method after it has determined the input port
width, output port width, and sample times of the S-function. This
allows the S-function to size the state and work vectors based on
the number and sizes of inputs and outputs and/or the number of sample
times. This method specifies the state and work vector sizes via the
macros ssGetNumContStates, ssSetNumDiscStates, ssSetNumRWork, ssSetNumIWork, ssSetNumPWork, ssSetNumModes, and ssSetNumNonsampledZCs.
A C-MEX S-function needs to implement this method only if it
does not know the sizes of all the work vectors it requires when the
engine invokes the function's mdlInitializeSizes method.
If this S-function implements mdlSetWorkWidths,
it should initialize the sizes of any work vectors that it needs to DYNAMICALLY_SIZED in mdlInitializeSizes,
even for those whose exact size it knows at that point. The S-function
should then specify the actual size in mdlSetWorkWidths.
This method is only valid for simulation, and must be enclosed in
a #if defined(MATLAB_MEX_FILE) statement.
For a full example of a C MEX S-function using DWork vectors,
see the file sfun_rtwdwork.c used
in the Simulink model sfcndemo_sfun_rtwdwork.