How to reference mxArray between sFunctions with help of pWork?

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Christian 2018-10-22

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https://ww2.mathworks.cn/matlabcentral/answers/425428-how-to-reference-mxarray-between-sfunctions-with-help-of-pwork

编辑： Christian 2018-10-23

Hello,

I'm trying to call 'tic' and 'toc' MATLAB functions from within a sFunction Level 2. Since I want to have a rough information about the time between two calls to mdlUpdate of a block, the retirnvalue of 'tic' needs to be availale during calls.

I thought of initializing 'tic' during mdlStart, calculating 'toc' during mdlUpdate and afterwards, also in mdlUpdate, updating 'tic'. Therefore I tried to use the pWork Vector, but somehow seem to be missing something.

Whenever I try to call themxCallMATLAB() function, I get an exception, declaring 'tic' needs to be of type uint64. Therefore I think something went wrong during the pointing the pWork Vetor at the allocated mxArray.

static void mdlStart(SimStruct *S)
{
    if (mxGetScalar(ssGetSFcnParam(S, SS_PARAMETER_BLOCK_TYPE)) == SS_BLOCKTYPE_CONFIG)
    {
        mxArray *work_vector = NULL; // mxCalloc(1, sizeof(mxArray*));
        work_vector = mxCreateNumericMatrix(1, 1, mxUINT64_CLASS, mxREAL);
        mexMakeArrayPersistent(work_vector);
          if(work_vector == NULL)
          { ssSetErrorStatus(S, "Faild to alloc memory for pWork Vector.\n"); }
          else
          {
              ssSetPWorkValue(S, SS_PWORK_CONF_TIC, work_vector);
              if(S->work.pWork[0] != work_vector)
              { ssSetErrorStatus(S, "[CONFBLOCK] Failed to assign PWork vector.\n"); }
              // Init 'tic' value
              mexCallMATLAB(1, &work_vector, 0, NULL, "tic");
          }
      }
  }
static void mdlUpdate(SimStruct *S, int_T tid) 
{ 
    if (mxGetScalar(ssGetSFcnParam(S, SS_PARAMETER_BLOCK_TYPE)) == SS_BLOCKTYPE_CONFIG)
    {
        // Block Information
        mxArray *tic, *elapsed;
          tic = (mxArray*) ssGetPWork(S);
          // tic = (mxArray*) ssGetPWorkValue(S, , SS_PWORK_CONF_TIC);
          elapsed = mxCreateDoubleMatrix(1,1, mxREAL);            
          mexCallMATLAB(1, &elapsed, 1, &tic, "toc");
          // Evaluate 'toc' result
          double *secs = mxGetDoubles(elapsed);
          DEBUG_MSG("[ConfigBlock] TSM_Timer_Milliseconds (%u)", milliseconds);
          // Call tsm_timer
          tsm_timer_milliseconds(milliseconds);
          // Update _tic
          mexCallMATLAB(1, &tic, 0, NULL, "tic");
      }
  }

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James Tursa 2018-10-22

Is there some reason you don't want to use the C/C++ clock( ) function for this timing?

Christian 2018-10-23

That probably what I will do, but it was a first for me to call a MATLAB function with mexCallMATLAB(), so I was a bit stubborn in finishing this. Just out of curiosity.

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