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, M0 q+ b# B) Y0 s2 x9 B2 _: F, sMATLAB Coder可以从MATLAB代码生成独立的、可读性强、可移植的C/C++代码。6 g8 t. Z: ]/ Z
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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* F4 z% W! L+ L利用MATLAB Coder生成c++代码,并在vs2008中验证:( |% Z. @7 }- ~' f2 n: Q4 P6 X# p1 G
+ j4 c" B( m4 w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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$ h, `+ r# c7 ?7 B. R9 x8 |$ v5 c2、简单生成一个foo.m文件; o9 W0 o( T+ d' _
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function c = foo(a, b)%#codegen, [( a" ~& h5 ]. V3 _
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%This function muliplies a and b
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# l! ^) P4 x3 c+ H! ^c = a * b
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% K5 x0 n& f$ y) y& b2 v其中,%#codegen可以防止出现警告错误- v K) K1 d- p' X
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3、在命令窗口,输入mex -setpu,选中一个存在的编译器;& [( d( q% ?$ A! }
$ x& n+ ?- O4 r0 F+ H4、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;6 O+ z7 B! }! p6 V6 f, S
+ F: m, P2 m& J0 i9 e, B/ J6、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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/ Z# B9 _8 F# ]$ P+ V) T+ K. ?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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/ s. K. C% z4 l' G1 h4 H9 ^6 J) F9、点击More settings,GeneralàLanguage选择C++;InteRFace选项中去掉所有选项;Close;5 V% J, Q' J2 S6 j* Z7 m8 w
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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;5 G) c8 Z7 r, f; H
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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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3 @9 o5 n: X( q! b u* X- w13、test.cpp文件中代码为:+ |9 _0 B. @8 w/ {$ v: \" F1 I
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#include "stdafx.h". t. h7 X* m, Q4 H
. o4 g7 f/ x2 r) |#include "foo.h": } f' t, s9 Q: q
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#include <iostream>
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using namespace std;: K% J- Q9 B5 V# I3 U
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z) {+ M: A! w2 {- Eint _tmain(int argc, _TCHAR* argv[])
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double a = 0.0, b = 0.0, c = 0.0;
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6 E; [9 L$ N6 _7 ]: F& G cin>>a>>b;
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7 | G: o' R( r5 U c = foo(a, b);. Q q+ J% H! l+ G M: F# W
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cout<<"c = "<<c<<endl;
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return 0;; A/ s: x; ~+ F i6 i" U! b2 }
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# E( K) ?# w6 z$ Y一个复杂的例子,求一个数的n次方根:7 |9 q& Y5 D8 R/ a7 o
Y; u, `/ D ]' {" i0 i1、 两个.m文件:
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8 B2 B& G: }# D" j$ Vnrt.m:2 H! H* o& `" }2 x* I. i1 k
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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 find7 c) W; H; Z% g l3 d: D
* ^* F _% j! s; r4 V%the nth root of a number, a, to the tolerance, tol.
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%The square root; q' i. C, j6 `& M+ e
5 ?7 ], o/ E1 F0 A) Y( ?% nrt(10, 2), or nrt(10, 2, 1e-9)0 }6 s D7 p+ T9 q
0 m. v6 S8 Z7 \ P5 s) }%The "n" root9 u9 K/ n* e3 @2 S, i) M+ }
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%nrt(10, n), or nrt(10, n, 1e-9)2 L& j& ?! M9 e" [1 c9 a; V
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9 b- \* V2 q& k( [6 \0 _' oa = varargin{1};0 E" j' @6 M4 }5 {! R
4 X' r/ R! b, O5 W) j! yn = varargin{2};6 o* O& `! M; G0 W
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if nargin ~= 33 R) a% x9 N H. l/ {
5 x" D" U9 P# P7 \9 n) w$ Z tol = 1e-9;
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tol = varargin{3};
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end
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& }- ^4 W7 k) y7 g3 [/ T( |if a < 0
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b+ ~8 P& g* D nth_rt = 0;
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% z* F7 W- G9 ~- o. Y iterations = 0;
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; F# E2 u- j6 d* c1 g: A hstry = 0;
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6 k" |* d q5 f# d5 s# \4 { [nth_rt, hstry] = newtonSearchAlgorithm(a, n, tol);
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5 H! m( G4 t& f5 W$ N- R# Z# e iterations = length(find(hstry ~= 0));- D' T! X: g* m
3 ?* b; K% p, H7 J, n/ F %iterations = sum(hstry ~= 0);
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newtonSearchAlgorithm.m:- C; Y7 O8 T; [ Q1 M
; D, s/ W2 w4 m( p1 q; ~function [x, h] = newtonSearchAlgorithm(b, n, tol) %#codegen
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%Given, "a", this function finds the nth root of a6 q9 h2 A8 C" r1 Z p
, L; }2 j: \, p; Q/ C q( J( v: u%number by finding where: x^n-a = 0* Q! |9 M4 k/ B3 C# a, C; n
6 L+ T& g5 `" a, Icoder.inline('never'); %使其生成一个单独的c++文件/ l( S1 l8 P1 Z5 A( n# v: ^) k
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notDone = 1;
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aNew = 0; %Refined Guess Initialization
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4 C) n" Q! ^5 g' l- T' xa = 1; %Initial Guess
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7 b7 `6 I4 l- V& `3 i `9 y% ecnt = 0;
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& U9 |% o6 `" a$ q+ b# Vh = zeros(50, 1);
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, @, S/ ?; _" m+ z1 Q% Th(1) = a;
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& L* e" ~8 k1 z mwhile notDone/ z+ G, K9 o+ I/ |
/ D" \! X; r9 Q, j$ s$ | cnt = cnt + 1;" w7 S" L, c+ I" ~
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[curVal, slope] = f_and_df(a, b, n); % square
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yint = curVal - slope * a;7 x {2 e+ W$ H' a1 k
9 k% J+ K' I% ~ aNew = -yint / slope; %The new guess
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( x: _( g! t' }+ a/ U- I# a' d h(cnt) = aNew; d, P) F1 @: U" ~+ \
) N0 A: B$ Q( Q, d if (abs(aNew-a) < tol) %Break if it's converged7 v6 C' n' F- y, ~
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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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end
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c2 |: w: ^& s Ix = aNew;
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function [f, df] = f_and_df(a, b, n)
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! U2 [; i* Y5 a* z%Our function is f=a^n-b and it's derivative is 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;0 S5 p# [# C3 l
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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;7 Y4 }, ?# Q. x% h
1 h+ {, L- m8 l0 _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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- @* O: Y* {2 t; ]0 e1 f2 ~5、添加三个输入,分别为10、2、1e-9;两个输入也可以;5 X/ \! o O& t+ m4 `
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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;0 i" u7 p% b- N7 m9 m% T
6 w" D$ L5 h7 [7 n7、点击More settings,General-->Language选择C++;Interface选项中去掉所有选项;Close;
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- u& W: D" d4 T8、点击Build,进行编译;点击View report,弹出Code Generation Report对话框;& Q7 Q2 b" X+ o3 w
7 s- p( y/ o! x8 n9、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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3 @! z# o* R u& x6 Y10、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"1 F+ @7 s6 x8 c- m( ? |
( R& M' }, P6 {! R; |#include "nrt.h"
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' U. R8 U, w8 U- U#include <iostream>5 g; z4 Z, g: O3 R9 K
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using namespace std;
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int _tmain(int argc, _TCHAR* argv[]) E6 _0 P; V7 |# W" Q( A; Y2 L) Y
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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;: s; n* p) K0 P8 u
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0 B" ?* d1 ~ w double hstry_data[50] = {0};& f' H% e& V, V7 {$ P- r( u( F, b
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int hstry_sizes[1] = {0};, J3 J& t/ i8 F4 S
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nrt(varargin_1, varargin_2, varargin_3, &nth_rt, &iterations, hstry_data, hstry_sizes);% Y8 R, R% M2 x+ q+ H ]
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cout<<"nth_rt = "<<nth_rt<<endl;$ x) G7 L" P `- |! @; A1 E6 a
3 I" z. f$ e, X. L' L 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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: v* X6 ]( S- m cout<<hstry_data<<endl;9 H) N; [! U0 d( i2 t
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cout<<"hstry_sizes = "<<hstry_sizes[0]<<endl;, K( [5 h) m0 f3 h
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return 0;
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