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标题:
举例说明一下使用MATLAB Coder从MATLAB生成C/C++代码的步骤
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作者:
pulbieup
时间:
2020-1-7 10:01
标题:
举例说明一下使用MATLAB Coder从MATLAB生成C/C++代码的步骤
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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。
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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。
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利用MATLAB Coder生成c++代码,并在vs2008中验证:
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一个简单的例子,两数相乘:
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1、安装matlab2011a或者更新版本;
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2、简单生成一个foo.m文件;
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function c = foo(a, b)%#codegen
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%This function muliplies a and b
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c = a * b
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其中,%#codegen可以防止出现警告错误
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3、在命令窗口,输入mex -setpu,选中一个存在的编译器;
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4、在命令窗口输入coder(图形界面),回车,弹出MATLAB Coder Project对话框;
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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;
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6、在Overview选项卡中,点击Add files,弹出对话框,选中foo.m打开;
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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;
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8、选中Build选项卡,Output type中选择c/c++ Static Library;选中Generate code only;
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9、点击More settings,GeneralàLanguage选择C++;Interface选项中去掉所有选项;Close;
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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;
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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;
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12、在foo.cpp文件中添加#include “stdafx.h”;
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13、test.cpp文件中代码为:
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#include "stdafx.h"
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#include "foo.h"
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#include <iostream>
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using namespace std;
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int _tmain(int argc, _TCHAR* argv[])
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{
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double a = 0.0, b = 0.0, c = 0.0;
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cin>>a>>b;
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c = foo(a, b);
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cout<<"c = "<<c<<endl;
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return 0;
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}
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一个复杂的例子,求一个数的n次方根:
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1、 两个.m文件:
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nrt.m:
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function [nth_rt, iterations, hstry] = nrt(varargin)%#codegen
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%This function will use a Newton Search Technique to find
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%the nth root of a number, a, to the tolerance, tol.
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%The square root
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% nrt(10, 2), or nrt(10, 2, 1e-9)
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%The "n" root
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%nrt(10, n), or nrt(10, n, 1e-9)
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a = varargin{1};
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n = varargin{2};
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if nargin ~= 3
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tol = 1e-9;
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else
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tol = varargin{3};
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end
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if a < 0
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nth_rt = 0;
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iterations = 0;
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hstry = 0;
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else
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[nth_rt, hstry] = newtonSearchAlgorithm(a, n, tol);
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iterations = length(find(hstry ~= 0));
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%iterations = sum(hstry ~= 0);
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end
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newtonSearchAlgorithm.m:
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function [x, h] = newtonSearchAlgorithm(b, n, tol) %#codegen
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%Given, "a", this function finds the nth root of a
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%number by finding where: x^n-a = 0
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coder.inline('never'); %使其生成一个单独的c++文件
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notDone = 1;
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aNew = 0; %Refined Guess Initialization
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a = 1; %Initial Guess
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cnt = 0;
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h = zeros(50, 1);
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h(1) = a;
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while notDone
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cnt = cnt + 1;
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[curVal, slope] = f_and_df(a, b, n); % square
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yint = curVal - slope * a;
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aNew = -yint / slope; %The new guess
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h(cnt) = aNew;
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if (abs(aNew-a) < tol) %Break if it's converged
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notDone = 0;
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elseif cnt > 49 %after 50 iterations, stop
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notDone = 0;
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aNew = 0;
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else
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a = aNew;
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end
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end
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x = aNew;
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function [f, df] = f_and_df(a, b, n)
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%Our function is f=a^n-b and it's derivative is n*a^(n-1).
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f = a^n-b;
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df = n*a^(n-1);
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2、 在命令窗口输入coder(图形界面),回车,弹出MATLAB Coder Project对话框;
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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;
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4、在Overview选项卡中,点击Add files,弹出对话框,选中nrt.m打开;
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5、添加三个输入,分别为10、2、1e-9;两个输入也可以;
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6、选中Build选项卡,Output type中选择c/c++ Static Library;选中Generate code only;
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7、点击More settings,General-->Language选择C++;Interface选项中去掉所有选项;Close;
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8、点击Build,进行编译;点击View report,弹出Code Generation Report对话框;
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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;
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10、分别在nrt.cpp、newtonSearchAlgorithm.cpp文件中添加#include “stdafx.h”;
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11、test.cpp文件中代码为:
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#include "stdafx.h"
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#include "nrt.h"
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#include <iostream>
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using namespace std;
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int _tmain(int argc, _TCHAR* argv[])
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{
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double varargin_1 = 0, varargin_2 = 0, varargin_3 = 1e-9;
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cin>>varargin_1>>varargin_2;
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double nth_rt = 0, iterations = 0;
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double hstry_data[50] = {0};
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int hstry_sizes[1] = {0};
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nrt(varargin_1, varargin_2, varargin_3, &nth_rt, &iterations, hstry_data, hstry_sizes);
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cout<<"nth_rt = "<<nth_rt<<endl;
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cout<<"iterations = "<<iterations<<endl;
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cout<<"hstry_data = "<<endl;
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for (int i=0; i<50; i++)
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{
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cout<<hstry_data<<endl;
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}
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cout<<"hstry_sizes = "<<hstry_sizes[0]<<endl;
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return 0;
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}
作者:
yin123
时间:
2020-1-7 18:07
先标记一下,后面好好研究一下
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