MATLAB Coder from MATLAB code generated independently, readable, portable C / C ++ codes .
Coder MATLAB code used to generate three steps: ① preparing MATLAB algorithm for generating a code; ② compatibility check MATLAB code (some matlab code statement is not considered a c / c ++ Code); ③ generating source code or end-use MEX .
Generated using MATLAB Coder c ++ code and verify in vs2008:
A simple example, multiplying the number two :
1, the installation matlab2011a or later;
2, to generate a simple foo.m file;
function c = foo(a, b)%#codegen
%This function muliplies a and b
c = a * b
Which, % # CodeGen warning can prevent errors
3, in the command window, enter mex -setup, select an existing compiler;
4, in the command window, type coder (GUI), Enter, MATLAB Coder Project pop-up dialog box;
5. In the New Name tab in a project name foo.prj; click Ok, MATLAB Coder MEX Function pop-up dialog box;
6, in the Overview tab, click Add files, the pop-up dialog box, select foo.m open;
7, click the variable a, select Define by Example ..., MATLAB Coder Define by Example pop-up dialog box input 5 in MATLAB Expression, the click OK; b is also the same variable corresponding operation, input 6;
8, select the Build tab, Output type selected in c / c ++ Static Library; select Generate code only;
9, click More settings, GeneralàLanguage choose C ++; Interface options to remove all the options; Close;
10, Click the Build, compile; click View report, the pop-up dialog box Code Generation Report In this case, the variables a, b, c displays the corresponding variable information;
11, using the vs2008 build a console application, the resulting documents foo.h, foo.cpp, rtwtypes.h, foo_types.h Kaodao related directory and add to the application;
12, add #include "stdafx.h" in foo.cpp file; // VC ++ 6.0 can not find the library, the actual test, ignored
13, test.cpp file code: // write their own test of a file
// # include "stdafx.h" // Ignore
#include "foo.h"
#include <iostream>
using namespace std;
int _tmain (int argc, _TCHAR * argv []) // test to the actual main ()
{
double a = 0.0, b = 0.0, c = 0.0;
cin>>a>>b;
c = foo(a, b);
cout<<"c = "<<c<<endl;
return 0;
}
A more complex example, a number of n - th root of :
1, two .m file:
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');% allowed c ++ to generate a single file
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, in the command window, type coder (GUI), Enter, MATLAB Coder Project pop-up dialog box;
3. Enter the New Name tab in a project name nrt.prj; click Ok, MATLAB Coder MEX Function pop-up dialog box;
4, in the Overview tab, click Add files, the pop-up dialog box, select nrt.m open;
5, three input add, respectively 10,2,1e-9; two inputs may be;
6, select the Build tab, Output type selected in c / c ++ Static Library; select Generate code only;
7, click More settings, GeneralàLanguage choose C ++; Interface options to remove all the options; Close;
8, click Build, compile; click View report, Code Generation Report pop-up dialog box;
9, use vs2008 build a console application, the resulting documents nrt.cpp, nrt.h, newtonSearchAlgorithm.cpp, newtonSearchAlgorithm.h, nrt_types.h, rtwtypes.h Kaodao relevant directory and add it to your application ;
10, respectively, add #include "stdafx.h" in nrt.cpp, newtonSearchAlgorithm.cpp file;
11, test.cpp file code:
#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;
}
reference:
1, MATLAB Coder webinar recording of video http://v.youku.com/v_show/id_XMzA3MTA3NDQ4.html
2、http://www.mathworks.cn/products/matlab-coder/
Original: https://blog.csdn.net/bhj5787/article/details/17093961