User`s guide

3 Writing S-Functions As C-MEX files
3-74
/*========================*
* General Defines/macros *
*========================*/
/* index to Upper Limit */
#define I_PAR_UPPER_LIMIT 0
/* index to Upper Limit */
#define I_PAR_LOWER_LIMIT 1
/* total number of block parameters */
#define N_PAR 2
/*
* Make access to mxArray pointers for parameters more readable.
*/
#define P_PAR_UPPER_LIMIT ( ssGetSFcnParam(S,I_PAR_UPPER_LIMIT) )
#define P_PAR_LOWER_LIMIT ( ssGetSFcnParam(S,I_PAR_LOWER_LIMIT) )
#define MDL_CHECK_PARAMETERS
#if defined(MDL_CHECK_PARAMETERS) && defined(MATLAB_MEX_FILE)
/* Function: mdlCheckParameters =============================================
* Abstract:
* Check that parameter choices are allowable.
*/
static void mdlCheckParameters(SimStruct *S)
{
int_T i;
int_T numUpperLimit;
int_T numLowerLimit;
const char *msg = NULL;
/*
* check parameter basics
*/
for ( i = 0; i < N_PAR; i++ ) {
if ( mxIsEmpty( ssGetSFcnParam(S,i) ) ||
mxIsSparse( ssGetSFcnParam(S,i) ) ||
mxIsComplex( ssGetSFcnParam(S,i) ) ||
!mxIsNumeric( ssGetSFcnParam(S,i) ) ) {
msg = "Parameters must be real vectors.";
goto EXIT_POINT;
}
}
/*
* Check sizes of parameters.
*/
numUpperLimit = mxGetNumberOfElements( P_PAR_UPPER_LIMIT );
numLowerLimit = mxGetNumberOfElements( P_PAR_LOWER_LIMIT );