Matlab in C :: linking problem

I am using DevC++ as compiler on Windows 2000.

I tried the code from Matlab's documentation to use matlab functions in C, but its giving an compile time error.

Code:

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  [Linker error] undefined reference to `engOpen'
  // same for other matlab declarations and function calls

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I have added the lib and include directories with matlab into the compiler options.

this is the code

Code:

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/*
 *  engdemo.c
 *
 *  This is a simple program that illustrates how to call the
 *  MATLAB engine functions from a C program.
 *
 * Copyright (c) 1984-2000 The MathWorks, Inc.
 * Revision: 1.8 $
 */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "engine.h"
#define  BUFSIZE 256

int main()

{
  Engine *ep;
  mxArray *T = NULL, *result = NULL;
  char buffer[BUFSIZE];
  double time[10] = {0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0,
                      8.0, 9.0};
  /*
    * Start the MATLAB engine locally by executing the string
    * "matlab".
    *
    * To start the session on a remote host, use the name of
    * the host as the string rather than \0.
    *
    * For more complicated cases, use any string with whitespace,
    * and that string will be executed literally to start MATLAB.
    */
  if (!(ep = engOpen("\0"))) {
      fprintf(stderr, "\nCan't start MATLAB engine\n");
      return EXIT_FAILURE;
  }

  /*
    * PART I
    *
    * For the first half of this demonstration, we will send data
    * to MATLAB, analyze the data, and plot the result.
    */

  /*
    * Create a variable for our data.
    */
  T = mxCreateDoubleMatrix(1, 10, mxREAL);
  memcpy((void *)mxGetPr(T), (void *)time, sizeof(time));

  /*
    * Place the variable T into the MATLAB workspace.
    */
  engPutVariable(ep, "T", T);

  /*
    * Evaluate a function of time, distance = (1/2)g.*t.^2
    * (g is the acceleration due to gravity).
    */
  engEvalString(ep, "D = .5.*(-9.8).*T.^2;");

  /*
    * Plot the result.
    */
  engEvalString(ep, "plot(T,D);");
  engEvalString(ep, "title('Position vs. Time for a falling object');");
  engEvalString(ep, "xlabel('Time (seconds)');");
  engEvalString(ep, "ylabel('Position (meters)');");

  /*
    * Use fgetc() to make sure that we pause long enough to be
    * able to see the plot.
    */
  printf("Hit return to continue\n\n");
  fgetc(stdin);

  /*
    * We're done for Part I! Free memory, close MATLAB engine.
    */
  printf("Done for Part I.\n");
  mxDestroyArray(T);
  engEvalString(ep, "close;");

  /*
    * PART II
    *
    * For the second half of this demonstration, we will request
    * a MATLAB string, which should define a variable X.  MATLAB
    * will evaluate the string and create the variable.  We
    * will then recover the variable, and determine its type.
    */
   
  /*
    * Use engOutputBuffer to capture MATLAB output, so we can
    * echo it back.
    */

  engOutputBuffer(ep, buffer, BUFSIZE);
  while (result == NULL) {
      char str[BUFSIZE];

      /*
      * Get a string input from the user.
      */
      printf("Enter a MATLAB command to evaluate.  This command should\n");
      printf("create a variable X.  This program will then determine\n");
      printf("what kind of variable you created.\n");
      printf("For example: X = 1:5\n");
      printf(">> ");

      fgets(str, BUFSIZE-1, stdin);
     
      /*
      * Evaluate input with engEvalString.
      */
      engEvalString(ep, str);
       
      /*
      * Echo the output from the command.  First two characters
      * are always the double prompt (>>).
      */
      printf("%s", buffer+2);

      /*
      * Get result of computation.
      */
      printf("\nRetrieving X...\n");
      if ((result = engGetVariable(ep,"X")) == NULL)
        printf("Oops! You didn't create a variable X.\n\n");
      else {
        printf("X is class %s\t\n", mxGetClassName(result));
      }
  }

  /*
    * We're done! Free memory, close MATLAB engine and exit.
    */
  printf("Done!\n");
  mxDestroyArray(result);
  engClose(ep);
 
  return EXIT_SUCCESS;
}

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Well, you added the directories to the compiler options, now try to add corresponding matlab libraries to the linker options.
There must be a string when you enumerate libs which your program will be linked with. I mean *.lib and *.obj files.

Well thanks I finally got it to work; but creating a adding the libraries in the project options through DevC++ IDE.

Quote:

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Originally Posted by aniskhan

Well thanks I finally got it to work; but creating a adding the libraries in the project options through DevC++ IDE.

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Hello,

I have the same problem with calling Matlab from C,
I am using DevC++ and Matlab 2011a, I added the libraries in the project options but I still have the same errors:

Errors:
[Linker error] undefined reference to `mxSetName'
[Linker error] undefined reference to `mxGetPr'
......

[Linker error] undefined reference to `engClose'

Can you please give me more details on how did you manage this problem

Thank you,