using mex for C

Hello,

I have a program in C that works and I would like to run MatLab in order to process data quickly and immediately.

I tried the following syntax, and Matlab by typing mex COSENO.C, it gives me:

C:\PROGRA~1\MATLAB\R2008A\BIN\MEX.PL: Error: 'COSENO.C' not found.

??? Error using ==> mex at 207 Unable to complete successfully.

Où je dois mettre le fichier CENTRE.C.et est ce qu'il y a d'autres changements à faire dans le programme.

     #include "mex.h"

void mexFunction( int nlhs, mxArray *plhs[],
        int nrhs, const mxArray *prhs[]) {

# include <math.h>
# include <conio.h>
# include <stdlib.h>
# include <stdio.h>
# include <alloc.h>
# include <io.h>

float disco  (char fichero[], int nfil, int ncol, int control,
  char huge *a, int tipo);

void ordena ( float huge *mod, long huge *orden, long int nd );

void main(void)

{
   char arch[30],arch0[30],arch1[30],archi[30];
   float huge *i;
   float huge *i1;
   float huge *masque;
   long  huge *qq;
   float pi, th, sumpos, sumneg, delta;
   int dim, j;
   long n2, n1, cont=0;
   long int p1, p2, p3, p4;

/*pi=3.141592654;*/
   

   clrscr();
   gotoxy(2,2);
   printf(" dimension du fichier: ");
   scanf("%d",&dim);
   gotoxy(2,4);
   n2=(long)dim * (long)dim ;

   p1 = 0L; p2 = (long)(dim/2);
   p3 = (long)dim* p2;
   p4 = p3 + p2;

  i=farcalloc((unsigned)n2,4);
  i1=farcalloc((unsigned)n2,4);
  masque=farcalloc((unsigned)n2,4);
  qq=farcalloc(n2,sizeof(long int));

  if ( i== NULL || i1== NULL || qq==NULL || masque==NULL){
  printf ( "\n\a\a no hay memoria ");
  goto fin;
  }

bik:
   clrscr();
  gotoxy(2,4);
  printf("  la valeur seuille th:  ");
  scanf("%f",&th);
  clrscr();

          gotoxy(2,8);
          printf(" donner le nom de la phase a analyser: ");
          scanf("%s",&arch0);
          j=disco(arch0,dim,dim,1,(char*)i,4);
          if(j!=1) goto fin;

          gotoxy(2,10);
          printf(" donner l'amplitude de l'objet a discriminer: ");
          scanf("%s",&arch1);
          j=disco(arch1,dim,dim,1,(char*)i1,4);
          if(j!=1) goto fin;

  gotoxy(2,12);
  printf(" donner le nom du masque optimal: ");
  scanf("%s",&archi);

  for( n1=0; n1<n2; n1++ ){
     i1[n1] *= (float)cos( (double)i[n1] );
     masque[n1] = 1;
  }
  masque[p1] = masque[p2] = masque[p3] = masque[p4] = 0;
  i1[p1] = i1[p2] = i1[p3] = i1[p4] = 0;

  ordena ( i1, qq, n2 );

  n1=0; sumpos = sumneg = 0;
  while (i1[ qq[n1] ] >0) {
    sumpos += i1[ qq[n1] ];
    n1++;
  }
  for(; n1<n2; n1++)  sumneg += i1[ qq[n1] ];

  delta = sumpos + sumneg;

  if( delta < 0  && fabs((double)delta) > th ) {
     n1=n2-1;
     while ( delta < 0  && fabs((double)delta) > th ){
        masque[ qq[n1] ] = 0;
        delta -= i1[ qq[n1] ];
        n1--; cont++;
        delta -= i1[ qq[n1] ];
        n1--; cont++;
     }
  } else if ( delta > th ){
     n1=0;
     while ( delta > th ){
        masque[ qq[n1] ] = 0;
        delta -= i1[ qq[n1] ];
        n1++; cont++;
        delta -= i1[ qq[n1] ];
        n1++; cont++;
     }
  }

  clrscr();
  gotoxy(10, 10);
  printf("Number of blocked pixels = %ld,   %f",
           cont+4L, (float)(cont+4L)/(float)n2);
  gotoxy(10, 14);
  printf("threshold = %f,     delta = %f", th, delta);

   j=disco(archi,dim,dim,2,(char*)masque,4);
   if(j!=1) goto fin;

fin:
        farfree((void far*)i);
        farfree((void far *)i1);
        farfree((void far *)masque);
        farfree((void far *)qq);
}

/***************************************************/
/*                  ORDENA                         */
/*   classés du plus grand au plus petit des éléments*/
/*   vecteur mod[]. L'ordre des éléments*/
/*   donnée dans la matrice orden[]. orden[0] nous donne*/
/*   élément m maximum, orden[1] ce qui suit, ...   */
/*   orden[nd-1] l'élément m de petites*/
/***************************************************/
void ordena ( float huge *mod, long huge *orden, long int nd )
{
   long kac, kfin, k, k1, o, p, p1;

     kfin = nd-1;
     do {
        k = -1;  kac = 0;  k1  = 0;
        do {
           k++; k1++;
           if ( mod[ orden[k] ] < mod[ orden[k1] ] ){
             o = orden[k]; orden[k]  = orden[k1];  orden[k1] = o;
             kac = k1; p = k; p1 = k-1;
             while ( p1>0 ) {
                if( mod[orden[p]] > mod[orden[p1]] ){
                   o = orden[p]; orden[p]  = orden[p1];  orden[p1] = o;
                   p--; p1--;
                } else p1 =0;
             };
           }
        } while ( k1 < kfin );
        kfin = kac; printf("\n %ld", kfin);
     } while ( kfin > 1 );
  }

   /*********************************************************************\
   *                                                                     *
   *                                                                     *
   *                            DISCO.C                                  *
   *                            =======                                  *
   *                                                                     *
   *         Numéros, le transfert de routine de tout type de*
   *         mémoire variable sur un disque ou un disque*
   *         à une variable de la mémoire.                               *
   *                                                                     *
   *                          ---------                                  *
   *                                                                     *
   *      Paramètre:                                                    *
   *                                                                     *
   *      fichero         -  Nom du fichier disque.               *
   *      nfil, ncol      -  Nombre de lignes et de colonnes.                 *
   *      control         -  1 pour lire le fichier.                    *
   *                         2 d'enregistrer dans le fichier.                *
   *      a               -  pointeur vers une variable.             *
   *      tipo            -  nombre d'octets par élément variable.    *
   *                                                                     *
   *                                                                     *
   \*********************************************************************/

float disco  (char fichero[], int nfil, int ncol, int control,
  char huge *a, int tipo)

{
        long int n, cont, ng;
        int unidad, j, cociente, resto;

          if (control == 1)  {
                  if ((unidad = open (fichero,1))  == -1)  {
                          return (-1);
                  }
                  cont = (long) nfil * (long) ncol * tipo;
                  resto = cont % 32768;
                  cociente = cont / 32768;
                  for (j = 0, n = 0; j < cociente; j++,n += 32768)
                          _read (unidad, (char*)&a[n], 32768);
                  _read (unidad, (char*)&a[n], resto);
                  close (unidad);
                  return (1);
          }
          if (control == 2)  {
                  if ((unidad = creat (fichero, 200))  == -1)  {
                          return (-1);
                  }
                  cont = (long) nfil * (long) ncol * tipo;
                  resto = cont % 32768;
                  cociente = cont / 32768;
                  ng = 0;
                  for (j = 0, n = 0; j < cociente; j++, n += 32768)
                       ng = ng + (unsigned) _write (unidad, (char*)&a[n], 32768);
                  ng = ng + (unsigned) _write (unidad, (char*)&a[n], resto);
                  if (ng != cont)   {
                          return (0);
                  }

                  close (unidad);
                  return (1);
          }
          return (0);
  }
  }

Answer 1

[Jan]

Your C-file does not contain the function "mexFunction", but ou need one as gateway. But this does not explain why "mex CENTRE.C" searches for the file "COSENO.C". What is "COSENO.C"?

[Jan]

Is the file "COSENO.C" in the current folder?!

[Eric Moore]

I think it does, it looks like he's taken his working C program and placed it inside of the { } defining the body of the mexFunction function.

Answer 2

[Matt Fig]

Is the name of your file saved on disk as COSENO.C (capitalized and all)?

Answer 3

[nomad nomad]

I'm wrong, I meant by typing COSENO.C.

[Kaustubha Govind]

When you type the following at the MATLAB prompt:

>> !cd

Does it return the same path as the current directory in MATLAB?

Answer 4

[nomad nomad]

it gives me this way:

C:\Users\Adil\Documents\MATLAB

[Matt Fig]

Please respond to answers by using the comments, not by posting multiple new 'answers' which do not actually answer the original question...

[Kaustubha Govind]

Is "C:\Users\Adil\Documents\MATLAB" where your source file is present? If yes, please paste the response of:

>> mex -v COSENO.C

Also, like Matt Fig previously asked - is your MEX-file really saved as COSENO.C?