举例说明使用MATLAB Coder从MATLAB生成C/C++代码步骤

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 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 -setpu,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;

12、在foo.cpp文件中添加#include “stdafx.h”;

13、test.cpp文件中代码为:

#include "stdafx.h"

#include "foo.h"

#include <iostream>

 

using namespace std;

 

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

{

 

    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 %after 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,General-->Language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

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

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转载自blog.csdn.net/fengbingchun/article/details/6793826
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