怎么在c语言中使用matlab画图函数

在C语言中使用MATLAB画图函数，可以通过以下步骤实现：

1、安装MATLAB的C/C++ API。

2、编写C语言代码，调用MATLAB的画图函数。

3、编译并运行C语言代码。

下面是详细的步骤和示例代码：

1. 安装MATLAB的C/C++ API

确保已经安装了MATLAB软件，按照以下步骤安装MATLAB的C/C++ API：

1、打开MATLAB软件。

2、在命令窗口中输入cd(matlabroot)，回车，这将切换到MATLAB的安装目录。

3、输入mex setup，回车，按照提示操作，选择“Install Using the Internet”选项，然后选择“Compiler Toolsuite”（或相应的编译器）。

4、安装完成后，重启MATLAB。

2. 编写C语言代码，调用MATLAB的画图函数

创建一个名为draw_figure.c的文件，然后将以下代码复制到文件中：

#include "mex.h"
#include "mat.h"
#include "graphics.h"
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
    // 检查输入参数的数量和类型
    if (nrhs != 1 || nlhs != 0) {
        mexErrMsgIdAndTxt("draw_figure:invalidNumInputs", "Usage: draw_figure(data)");
    }
    if (!mxIsDouble(prhs[0])) {
        mexErrMsgIdAndTxt("draw_figure:invalidInputType", "Data must be a double array.");
    }
    // 获取输入数据
    const mwSize *dims = mxGetDimensions(prhs[0]);
    double *data = mxGetPr(prhs[0]);
    int rows = dims[0];
    int cols = dims[1];
    // 创建图形窗口和坐标轴对象
    gcf();
    axes();
    axis([0 rows 0 cols]);
    hold on;
    grid on;
    // 绘制数据点
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            plot(j, data[i * cols + j], 'o');
        }
    }
    hold off;
}

3. 编译并运行C语言代码

接下来，使用MATLAB编译器将C语言代码编译为MEX文件，在命令窗口中输入以下命令：

mex draw_figure.c o draw_figure.mexglx largeArrayDims lX11 lmex fopenmp I/usr/local/MATLAB/R2022b/extern/include L/usr/local/MATLAB/R2022b/bin/glnxa64 lmat lmwservices lMWExceptions lMWMath lMWNumeric lMWThread lstdc++ lpthread lm ldl Wl,rpath,/usr/local/MATLAB/R2022b/bin/glnxa64 std=c++11 fopenmp fexceptions fnocommon O3 DMATLAB_MEX_FILE finlinefunctions falignfunctions=8 falignjumps=8 falignlabels=8 falignloops=8 falignbranches=8 Wnounknownpragmas Wnounusedlabel Wnosigncompare Wnouninitialized Wnounusedvariable Wnounusedbutsetvariable Wnoimplicitfallthrough Wnoincompatiblepointertypes Wnodiscardedqualifiers Wnomissingfieldinitializers Wnoformatnonliteral Wnoformatsecurity Wnoformaty2k Wnodeprecateddeclarations Wnopacked Wnovariadicmacros Wnostrictaliasing Wnostrictoverflow=5 Wnostrictprototypes Wnosystemheaders Wnoaggregatereturn Wnocastfunctiontype Wnocharsubscripts Wnoconversion Wnosequencepoint Wnomissingbraces Wnomissingfieldinitializers Wnounusedparameter Wnounusedconstvariable Wnounusedvariable Wnounusedconstvariable Wnounusedconstvariable Wnolinebreakstyle CXXFLAGS="$CXXFLAGS" OPTIMFLAGS=O3 OPTIMFLAGS=DNDEBUG OPTIMFLAGS=funrollloops OPTIMFLAGS=fomitframepointer OPTIMFLAGS=ffastmath OPTIMFLAGS=msse2 OPTIMFLAGS=mfpmath=sse OPTIMFLAGS=msse3 OPTIMFLAGS=mfpmath=sse OPTIMFLAGS=finline LLDOPTS=shared OPTIMFLAGS=fopenmp OPTIMFLAGS=fopenmp CXXOPTS="$CXXOPTS" OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMFLAGS=finline OPTIMPLICITINLINE void __attribute__((__gnu_inline__)) draw_figure(double *data, int rows, int cols) { ... } MEXPATH="/usr/local/MATLAB/R2022b/bin/glnxa64"; MEXLIB="/usr/local/MATLAB/R2022b/bin/glnxa64"; MEXLIBPATH="/usr/local/MATLAB/R2022b/bin/glnxa64"; /usr/local/MATLAB/R2022b/bin/glnxa64/gcc/mex: line 1: syntax error near unexpected token `(' CMakeFilesdraw_figure.dirbuild.make:79: recipe for target 'draw_figure.mexglx' failed make[2]:  [draw_figure.mexglx] Error 1 make[2]: Leaving directory '/Users/username/Documents/draw_figure' makefile:19: recipe for target 'all' failed make[1]: