c/c++如何调用matlab脚本

野性酷女 2023-02-11 02:00 6阅读 0赞

/* * engdemo.cpp * * A simple program to illustrate how to call MATLAB * Engine functions from a C++ program. * * Copyright 1984-2011 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 };
    
    	/* * Call engOpen with a NULL string. This starts a MATLAB process * on the current host using the command "matlab". */
    	if (!(ep = engOpen(""))) { 
    		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 figure. */
    	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. */
    	    printf("%s", buffer);
    	    
    	    /* * 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;
    }
    
    [参考](https://www.mathworks.com/help/matlab/matlab_external/calling-matlab-software-from-a-c-application.html)