coder: problem with externally defined structures

Hi, I'd like to generate a C code from an m-function (gc1D.m), which accpets an externally defined structure as an input argument. The same structure is passed on within the m-function to a custom C-function (rfgc1D.c), which reads a data file, performs some operations on that and returns another externally defined structure (through a pointer) and an integer value as an indicator of succesfull reading. Here are header files with a C-function prototype and parts of structures definitions (just the relevant ones):

rfgc1D.h

#ifndef _RFGC1D_H_

#define _RFGC1D_H_

#include "udf_gc1D.h"

extern int rfgc1D(const fluentDataStruct, gcDataStruct *);

#endif

udf_gc1D.h

#ifndef _UDF_GC1D_H_

#define _UDF_GC1D_H_

typedef struct {

  char *path2file;
  
  double grateL;
  
  double grateW;
  
  double grateV;
  
  int nGrateCells;
  
  double Acell;
  
  double *Tenv;
  
} fluentDataStruct;

.     .     .     .

.     .     .     .

.     .     .     .

typedef struct {

  double gasInletT;
  
.     .     .     .

.     .     .     .

.     .     .     .

    critStruct crit;

    relaxStruct relax;

    double *heaterTval;

} gcDataStruct;

#endif

Important fields of these structures are nGrateCells and Tenv from fluentDataStruct and heaterTval from gcDataStruct. There is a piece of code at the end of

rfgc1D.c:

int rfgc1D(const fluentDataStruct fData, gcDataStruct *gcData){

     FILE *datafile;

      .     .     .     .

      .     .     .     .

      .     .     .     .

     for(i=0;i<fData.nGrateCells;i++)
          
        gcData->heaterTval[i] = fData.Tenv[i];

     return 1;

}

The function is called using coder.ceval within the primary function

gc1D.c:

function [] = gc1D(fluentData) %#codegen

          .     .     .     .

          .     .     .     .

          .     .     .     .

          coder.cstructname(fluentData,'fluentDataStruct','extern','HeaderFile','udf_gc1D.h'); 

gcData=gcDataInit(fluentData.nGrateCells); % initialize gcData

        coder.cstructname(gcData,'gcDataStruct','extern','HeaderFile','udf_gc1D.h');

read_succ=coder.ceval('rfgc1D',fluentData,coder.wref(gcData)); %read file

          .     .     .     .
          .     .     .     .

% other local matlab variables are defined here using gcData, including the
% following one

solid.irrad = gcData.heaterEmiss*steffBoltz*gcData.heaterTval(1)^4;

          .     .     .     .

          .     .     .     .

gcDataInit is an m-function for initializing the structure gcData.

gcDataInit.m

function [gcData] = gcDataInit(nCells)

gcData.gasInletT=298.15;

.     .     .     .

.     .     .     .

.     .     .     .

gcData.heaterTval=zeros(1,nCells);

  coder.cstructname(gcData.crit.Ts,'solidTempCritStruct','extern','HeaderFile','udf_gc1D.h');

  coder.cstructname(gcData.crit.Tg,'gasTempCritStruct','extern','HeaderFile','udf_gc1D.h');

  coder.cstructname(gcData.crit.Vg,'gasVelCritStruct','extern','HeaderFile','udf_gc1D.h');

  coder.cstructname(gcData.crit.Rhos,'solidRhoCritStruct','extern','HeaderFile','udf_gc1D.h');

  coder.cstructname(gcData.crit.Yg,'gasYiCritStruct','extern','HeaderFile','udf_gc1D.h');

  coder.cstructname(gcData.crit.Ys,'solidYiCritStruct','extern','HeaderFile','udf_gc1D.h');

  coder.cstructname(gcData.relax.Ts,'solidTempRelaxStruct','extern','HeaderFile','udf_gc1D.h');

  coder.cstructname(gcData.relax.Tg,'gasTempRelaxStruct','extern','HeaderFile','udf_gc1D.h');

  coder.cstructname(gcData.relax.Vg,'gasVelRelaxStruct','extern','HeaderFile','udf_gc1D.h');

  coder.cstructname(gcData.relax.Rhos,'solidRhoRelaxStruct','extern','HeaderFile','udf_gc1D.h');

  coder.cstructname(gcData.relax.Yg,'gasYiRelaxStruct','extern','HeaderFile','udf_gc1D.h');

  coder.cstructname(gcData.relax.Ys,'solidYiRelaxStruct','extern','HeaderFile','udf_gc1D.h');

  coder.cstructname(gcData.crit,'critStruct','extern','HeaderFile','udf_gc1D.h');

  coder.cstructname(gcData.relax,'relaxStruct','extern','HeaderFile','udf_gc1D.h');

  coder.cstructname(gcData,'gcDataStruct','extern','HeaderFile','udf_gc1D.h');

end

When building the project, this error occurs:

gc1D.c:1376: error: request for member ‘data’ in something not a structure or union

This code can be found in the compiled code gc1D.c at the line 1376:

1375: solid.irrad = gcData.heaterEmiss * 5.66E-8 * rt_powd_snf

1376: (gcData.heaterTval->data[0], 4.0);

Apparently, data is not defined as a field of heaterTval in the definition of the structure. What am I doing wrong? What should I do to tell the coder not to define this additional field? I'd appreciate your help!

[Kaustubha Govind]

Tomas: You may want to contact MathWorks Tech Support if you do not receive a response here.

[Tomas Jurena]

Thank you for your comment. I can wait for anyone's response for a few more days while working on another part of the project. However, afterwards if I do not get any or I do not resolve the problem myself, I'll ask the Tech Support for help.