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:①准备用于产生代码的MATLAB算法;②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);③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; 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、 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
a
cnt h = zeros(50, 1);
h(1) while notDone cnt = cnt + 1;
[curVal, slope] = f_and_df(a, b, n); % 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 df = n*a^(n-1);
2、 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./products/matlab-coder/
|
|