Ubuntu 14.04下用GCC及gfortran编写MEX程序（Matlab2012a）

Ubuntu 14.04下用GCC及gfortran编写MEX程序（Matlab2012a）一、先用apt-get安装一个低版本gcc sudo apt-get install gcc-4.4 g++-4.4 gfortran-4.4 matlab2012a可以支持到最高为4.4版本的gcc，而ubuntu14.04默认的gcc版本为4.8二、修改mexopts.sh sudo vi /opt/MATLAB/R2012a/bin/mexopts.sh 将所有的gcc、g++、gfortran出现分别替换成gcc-4.4、g++-4.4、gfortran-4.4 将CFLAGS="-ansi -D_GNU_SOURCE"改为CFLAGS="-std=c99 -D_GNU_SOURCE"以支持//风格注释三、启动matlab执行mex -setup命令>> mex -setup Options files control which compiler to use, the compiler and link command options, and the runtime libraries to link against. Using the "mex -setup" command selects an options file that is placed in /home/mymotif/.matlab/R2012a and used by default for "mex". An options file in the current working directory or specified on the command line overrides the default options file in /home/mymotif/.matlab/R2012a. To override the default options file, use the "mex -f" command （see "mex -help" for more information）.The options files available for mex are: 1: /opt/local/MATLAB/R2012a/bin/mexopts.sh : Template Options file for building gcc-4.4 MEX-files 0: Exit with no changesEnter the number of the compiler （0-1）:1/opt/local/MATLAB/R2012a/bin/mexopts.sh is being copied to/home/mymotif/.matlab/R2012a/mexopts.sh************************************************************************** Warning: The MATLAB C and Fortran API has changed to support MATLAB variables with more than 2^32-1 elements. In the near future you will be required to update your code to utilize the new API. You can find more information about this at: http://www.mathworks.com/help/techdoc/matlab_external/bsflnue-1.html Building with the -largeArrayDims option enables the new API.**************************************************************************四、测试（1）进入matlab工作目录，并创建源文件hello1.c内容如下：#include "mex.h"
void mexFunction（int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]）
{
int i;
i=mxGetScalar（prhs[0]）;
if（i==1）
mexPrintf（"hello,world！ "）;
else
mexPrintf（"大家好！ "）;
}
>> mex hello1.c>> hello1（0）大家好！>> hello1（1）hello,world！mexFunction 输入参数含义int nlhs :输出参数的个数mxArray * plhs :输出参数的 mxArray数组int nrhs :输入参数的个数mxArray * prhs: 输入参数的 mxArray 数组（2）g++例子：mexcpp.cpp

/*==========================================================
* mexcpp.cpp - example in MATLAB External Interfaces
*
* Illustrates how to use some C++ language features in a MEX-file.
* It makes use of member functions, constructors, destructors, and the
* iostream.
*
* The routine simply defines a class, constructs a simple object,
* and displays the initial values of the internal variables. It
* then sets the data members of the object based on the input given
* to the MEX-file and displays the changed values.
*
* This file uses the extension .cpp. Other common C++ extensions such
* as .C, .cc, and .cxx are also supported.
*
* The calling syntax is:
*
* mexcpp（ num1, num2 ）
*
* Limitations:
* On Windows, this example uses mexPrintf instead cout. Iostreams
* （such as cout） are not supported with MATLAB with all C++ compilers.
*
* This is a MEX-file for MATLAB.
* Copyright 1984-2009 The MathWorks, Inc.
*
*========================================================*/
/* $Revision: 1.5.4.4 $ */

#include <iostream>
#include <math.h>
#include "mex.h"

using namespace std;

extern void _main（）;

/****************************/
class MyData {

public:
void display（）;
void set_data（double v1, double v2）;
MyData（double v1 = 0, double v2 = 0）;
~MyData（） { }
private:
double val1, val2;
};

MyData::MyData（double v1, double v2）
{
val1 = v1;
val2 = v2;
}

void MyData::display（）
{
#ifdef _WIN32
mexPrintf（"Value1 = %g ", val1）;
mexPrintf（"Value2 = %g ", val2）;
#else
cout << "Value1 = " << val1 << " ";
cout << "Value2 = " << val2 << " ";
#endif
}

void MyData::set_data（double v1, double v2） { val1 = v1; val2 = v2; }

/*********************/

static
void mexcpp（
double num1,
double num2
）
{
#ifdef _WIN32
mexPrintf（" The initialized data in object: "）;
#else
cout << " The initialized data in object: ";
#endif
MyData *d = new MyData; // Create a MyData object
d->display（）; // It should be initialized to
// zeros
d->set_data（num1,num2）; // Set data members to incoming
// values
#ifdef _WIN32
mexPrintf（"After setting the object"s data to your input: "）;
#else
cout << "After setting the object"s data to your input: ";
#endif
d->display（）; // Make sure the set_data（） worked
delete（d）;
flush（cout）;
return;
}

void mexFunction（
int nlhs,
mxArray *[],
int nrhs,
const mxArray *prhs[]
）
{
double *vin1, *vin2;

/* Check for proper number of arguments */

if （nrhs ！= 2） {
mexErrMsgIdAndTxt（"MATLAB:mexcpp:nargin",
"MEXCPP requires two input arguments."）;
} else if （nlhs >= 1） {
mexErrMsgIdAndTxt（"MATLAB:mexcpp:nargout",
"MEXCPP requires no output argument."）;
}

vin1 = （double *） mxGetPr（prhs[0]）;
vin2 = （double *） mxGetPr（prhs[1]）;

mexcpp（*vin1, *vin2）;
return;
}
>> mex mexcpp.cpp>> mexcpp（2,4）The initialized data in object:Value1 = 0Value2 = 0
After setting the object"s data to your input:Value1 = 2Value2 = 4（3）gfortran# include <fintrf.h>

subroutine mexFunction （ nlhs, plhs, nrhs, prhs ）

c*********************************************************************72
c
cc MEXFUNCTION is a MATLAB/F77 interface for the factorial function.
c
c Discussion:
c
c The MATLAB user types
c
c integer plhs（*）, prhs（*）
c integer nlhs, nrhs

integer nlhs
integer nrhs

mwpointer plhs（nlhs）
mwpointer prhs（nrhs）

call mexPrintf（"Hello MATLAB World！"）

return
end>> mex mexHelloWorld.F>> mexHelloWorldHello MATLAB World！>>>> Ubuntu下GCC、G++和gfortran版本切换 http://www.linuxidc.com/Linux/2015-09/123461.htmLinux升级GCC 4.8.1清晰简明教程（Ubuntu 12.04 64位版为例） http://www.linuxidc.com/Linux/2014-04/99583.htm在CentOS 6.4中编译安装GCC 4.8.1 + GDB 7.6.1 + Eclipse 在CentOS 6.4中编译安装GCC 4.8.1 + GDB 7.6.1 + EclipseUbuntu下Vim+GCC+GDB安装及使用 http://www.linuxidc.com/Linux/2013-01/78159.htmUbuntu下两个GCC版本切换 http://www.linuxidc.com/Linux/2012-10/72284.htmCentOS6.5升级手动安装GCC4.8.2 http://www.linuxidc.com/Linux/2015-01/112595.htmGCC 的详细介绍：请点这里
GCC 的下载地址：请点这里更多Ubuntu相关信息见Ubuntu 专题页面 http://www.linuxidc.com/topicnews.aspx？tid=2本文永久更新链接地址：http://www.linuxidc.com/Linux/2015-12/126164.htm