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/* $Revision: 1.8.4.1 $ */
/*
* engdemo.c
*
* This is a simple program that illustrates how to call the MATLAB
* Engine functions from a C program.
*
* Copyright 1984-2003 The MathWorks, Inc.
* All rights reserved
*/
#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+1];
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. Ensure first that the buffer is always NULL
* terminated.
*/
buffer[BUFSIZE] = '\0';
engOutputBuffer(ep, buffer, BUFSIZE);
while (result == NULL) {
char str[BUFSIZE+1];
/*
* 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, 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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