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 changes
Enter 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!\n");
? ? else
? ? ? ? mexPrintf("大家好！\n");
}
?
>> 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
#include
#include "mex.h"
?
using namespace std;
?
extern void _main();
?
/****************************/
class MyData {
?
public:
? void display();
? void set_data(double v1, double v