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  • 举例说明使用MATLAB Coder从MATLAB生成C/C++代码步骤

    MATLAB Coder可以从MATLAB代码生成独立的、可读性强、可移植的C/C++代码

    使用MATLAB Coder产生代码的3个步骤:准备用于产生代码的MATLAB算法;检查MATLAB代码的兼容性(有些matlab代码语句并不能生成c/c++代码);产生最终使用的源代码或MEX。

    利用MATLAB Coder生成c++代码,并在vs2008中验证:

    一个简单的例子,两数相乘

    1、安装matlab2011a或者更新版本;

    2、简单生成一个foo.m文件;

    function c = foo(a, b)%#codegen

    %This function muliplies a and b

    c = a * b

    其中,%#codegen可以防止出现警告错误

    3、在命令窗口,输入mex -setup,选中一个存在的编译器;

    4、在命令窗口输入coder(图形界面),回车,弹出MATLAB Coder Project对话框;

    5、在New选项卡Name中输入一个工程名foo.prj;点击Ok,弹出MATLAB Coder MEX Function对话框;

    6、在Overview选项卡中,点击Add files,弹出对话框,选中foo.m打开;

    7、单击变量a,选择Define by Example…,弹出MATLAB Coder Define by Example对话框,在MATLAB Expression中输入5,点击OK;同样变量b也进行相应操作,输入6;

    8、选中Build选项卡,Output type中选择c/c++ Static Library;选中Generate code only;

    9、点击More settings,GeneralàLanguage选择C++;Interface选项中去掉所有选项;Close;

    10、点击Build,进行编译;点击View report,弹出Code Generation Report对话框,此时,变量a、b、c会显示相应的变量信息;

    11、利用vs2008建立一个控制台应用程序,将生成的相关文件foo.h、foo.cpp、rtwtypes.h、foo_types.h拷到相关目录下并添加到应用程序中;(切记在vs2008中选项里面各项的修改)

    12、在foo.cpp文件中添加#include “stdafx.h”;//VC++6.0找不到这个库,实际测试时,忽略

    13、test.cpp文件中代码为: //自行编写的一个测试文件

    //#include "stdafx.h" //忽略

    #include "foo.h"

    #include <iostream>

     

    using namespace std;

     

    int _tmain(int argc, _TCHAR* argv[]) //实际测试时改为 main()

    {

     

    double a = 0.0, b = 0.0, c = 0.0;

     

    cin>>a>>b;

     

    c = foo(a, b);

     

    cout<<"c = "<<c<<endl;

     

    return 0;

    }

    一个复杂的例子,求一个数的n次方根

    1、  两个.m文件:

    nrt.m:

    function [nth_rt, iterations, hstry] = nrt(varargin)%#codegen

    %This function will use a Newton Search Technique to find

    %the nth root of a number, a, to the tolerance, tol.

    %The square root

    % nrt(10, 2), or nrt(10, 2, 1e-9)

    %The "n" root

    %nrt(10, n), or nrt(10, n, 1e-9)

     

    a = varargin{1};

    n = varargin{2};

     

    if nargin ~= 3

    tol = 1e-9;

    else

    tol = varargin{3};

    end

     

    if a < 0

    nth_rt = 0;

    iterations = 0;

    hstry = 0;

    else

    [nth_rt, hstry] = newtonSearchAlgorithm(a, n, tol);

    iterations = length(find(hstry ~= 0));

    %iterations = sum(hstry ~= 0);

    end

     

    newtonSearchAlgorithm.m

    function [x, h] = newtonSearchAlgorithm(b, n, tol) %#codegen

    %Given, "a", this function finds the nth root of a

    %number by finding where: x^n-a = 0

    coder.inline('never'); %使其生成一个单独的c++文件

    notDone = 1;

    aNew    = 0; %Refined Guess Initialization

    a       = 1; %Initial Guess

    cnt     = 0;

    h = zeros(50, 1);

    h(1)    = a;

    while notDone

    cnt = cnt + 1;

    [curVal, slope] = f_and_df(a, b, n); %  square

    yint = curVal - slope * a;

    aNew = -yint / slope; %The new guess

    h(cnt) = aNew;

    if (abs(aNew-a) < tol) %Break if it's converged

    notDone = 0;

    elseif cnt > 49 �ter 50 iterations, stop

    notDone = 0;

    aNew = 0;

    else

    a = aNew;

    end

    end

    x = aNew;

     

    function [f, df] = f_and_df(a, b, n)

    %Our function is f=a^n-b and it's derivative is n*a^(n-1).

     

    f  = a^n-b;

    df = n*a^(n-1);

     

    2、  在命令窗口输入coder(图形界面),回车,弹出MATLAB Coder Project对话框;

    3、在New选项卡Name中输入一个工程名nrt.prj;点击Ok,弹出MATLAB Coder MEX Function对话框;

    4、在Overview选项卡中,点击Add files,弹出对话框,选中nrt.m打开;

    5、添加三个输入,分别为10、2、1e-9;两个输入也可以;

    6、选中Build选项卡,Output type中选择c/c++ Static Library;选中Generate code only;

    7、点击More settings,GeneralàLanguage选择C++;Interface选项中去掉所有选项;Close;

    8、点击Build,进行编译;点击View report,弹出Code Generation Report对话框;

    9、利用vs2008建立一个控制台应用程序,将生成的相关文件nrt.cpp、nrt.h、newtonSearchAlgorithm.cpp、newtonSearchAlgorithm.h、nrt_types.h、rtwtypes.h拷到相关目录下并添加到应用程序中;

    10、分别在nrt.cpp、newtonSearchAlgorithm.cpp文件中添加#include “stdafx.h”;

    11、test.cpp文件中代码为:

    #include "stdafx.h"

    #include "nrt.h"

     

    #include <iostream>

     

    using namespace std;

     

    int _tmain(int argc, _TCHAR* argv[])

    {

    double varargin_1 = 0, varargin_2 = 0, varargin_3 = 1e-9;

     

    cin>>varargin_1>>varargin_2;

     

    double nth_rt = 0, iterations = 0;

     

    double hstry_data[50] = {0};

     

    int hstry_sizes[1] = {0};

     

    nrt(varargin_1, varargin_2, varargin_3, &nth_rt, &iterations, hstry_data, hstry_sizes);

     

    cout<<"nth_rt = "<<nth_rt<<endl;

    cout<<"iterations = "<<iterations<<endl;

     

    cout<<"hstry_data = "<<endl;

    for (int i=0; i<50; i++)

    {

    cout<<hstry_data[i]<<endl;

    }

     

    cout<<"hstry_sizes = "<<hstry_sizes[0]<<endl;

     

    return 0;

    }

    参考:

    1、录制的网上研讨会的MATLAB Coder视频http://v.youku.com/v_show/id_XMzA3MTA3NDQ4.html

    2、http://www.mathworks.cn/products/matlab-coder/

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  • 原文地址:https://www.cnblogs.com/renly/p/3000887.html
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