Ubuntu Linux Matlab mex

環境說明：Ubuntu 10.04 (LTS) AMD64 + Matlab 2011b

1. 安裝gcc g++

參考：http://stefaanlippens.net/cpp_mex_ubuntu804

zhang@ubuntu-desktop:~$ sudo apt-get install gcc-4.3 g++-4.3

2.  At the MATLAB Command Window prompt, type: 

>> 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/zhang/.matlab/R2011b 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/zhang/.matlab/R2011b.

    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: /usr/local/MATLAB/R2011b/bin/mexopts.sh : 
      Template Options file for building gcc MEX-files


0: Exit with no changes

Enter the number of the compiler (0-1):
1

Overwrite /home/zhang/.matlab/R2011b/mexopts.sh ([y]/n)? 
y

/usr/local/MATLAB/R2011b/bin/mexopts.sh is being copied to 
/home/zhang/.matlab/R2011b/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/support/solutions/en/data/1-5C27B9/?solution=1-5C27B9 
           Building with the -largeArrayDims option enables the new API. 
**************************************************************************

3. 警告

>> mex test.c

Warning: You are using gcc version "4.4.4-14ubuntu5)".  The version
         currently supported with MEX is "4.3.4".
         For a list of currently supported compilers see:
http://www.mathworks.com/support/compilers/current_release/

如果出現上述警告和錯誤，說明當前的Matlab版本不支援gcc 4.4。解決辦法如下。

4. 編輯檔案

zhang@ubuntu-desktop:~$ sudo gedit /usr/local/MATLAB/R2011b/bin/mexopts.sh

mexopts.sh

#----------------------------------------------------------------------------
            ;;
        glnxa64)
#----------------------------------------------------------------------------
            RPATH="-Wl,-rpath-link,$TMW_ROOT/bin/$Arch"
            # StorageVersion: 1.0
            # CkeyName: GNU C
            # CkeyManufacturer: GNU
            # CkeyLanguage: C
            # CkeyVersion:
            CC='gcc-4.3'
            CFLAGS='-ansi -D_GNU_SOURCE'
            CFLAGS="$CFLAGS  -fexceptions"
            CFLAGS="$CFLAGS -fPIC -fno-omit-frame-pointer -pthread"
            CLIBS="$RPATH $MLIBS -lm"
            COPTIMFLAGS='-O -DNDEBUG'
            CDEBUGFLAGS='-g'
            CLIBS="$CLIBS -lstdc++"
#
            # C++keyName: GNU C++
            # C++keyManufacturer: GNU
            # C++keyLanguage: C++
            # C++keyVersion: 
            CXX='g++-4.3'
            CXXFLAGS='-ansi -D_GNU_SOURCE'
            CXXFLAGS="$CXXFLAGS -fPIC -fno-omit-frame-pointer -pthread"
            CXXLIBS="$RPATH $MLIBS -lm"
            CXXOPTIMFLAGS='-O -DNDEBUG'
            CXXDEBUGFLAGS='-g'
#
            # FortrankeyName: gfortran
            # FortrankeyManufacturer: GNU
            # FortrankeyLanguage: Fortran
            # FortrankeyVersion: 
#
            FC='gfortran-4.3'
            FFLAGS='-fexceptions -fbackslash'
            FFLAGS="$FFLAGS -fPIC -fno-omit-frame-pointer"
            FLIBS="$RPATH $MLIBS -lm"
            FOPTIMFLAGS='-O'
            FDEBUGFLAGS='-g'
#
            LD="$COMPILER"
            LDEXTENSION='.mexa64'
            LDFLAGS="-pthread -shared -Wl,--version-script,$TMW_ROOT/extern/lib/$Arch/$MAPFILE -Wl,--no-undefined"
            LDOPTIMFLAGS='-O'
            LDDEBUGFLAGS='-g'
#
            POSTLINK_CMDS=':'
#----------------------------------------------------------------------------

綠色為原始部分；-4.3為增加部分。

參考：

https://help.ubuntu.com/community/MATLAB

http://ubuntuforums.org/showthread.php?p=7737533

重啟matlab

5. 測試

參見博文《C-mex執行個體》。 增加了寫mat檔案操作的.c檔案如下：

addtiontest.c

 1 #include <mex.h>
 2  
 3 double addtiontest(double x, double y);
 4 double doublesize(double a, double b);
 5  
 6 void mexFunction(int nlhs, mxArray *plhs[], int nrhs,const mxArray *prhs[])
 7 {
 8     double *a;
 9     double b, c;
10     
11     /******Output******/
12     plhs[0] = mxCreateDoubleMatrix(1, 1, mxREAL);
13     a = mxGetPr(plhs[0]);
14     
15     /******Input******/
16     b = *(mxGetPr(prhs[0]));
17     c = *(mxGetPr(prhs[1]));
18     *a = addtiontest(b, c);
19 }
20 
21 double addtiontest(double x, double y)
22 {
23     double z;
24     z = doublesize(x,y);
25     return z;
26 }

doublesize.c

 1 #include <stdio.h>
 2 #include <string.h> /* For strcmp() */
 3 #include <stdlib.h> /* For EXIT_FAILURE, EXIT_SUCCESS */
 4 #include <mex.h>
 5 #include "mat.h"
 6 
 7 double doublesize(double a, double b)
 8 {
 9     MATFile *pmat;    
10     const char *file = "mattest.mat";    
11     
12     mxArray *mat_data;
13     mat_data = mxCreateDoubleMatrix(1,1,mxREAL); 
14     memcpy((void *)(mxGetPr(mat_data)), (void *) &a, sizeof(&a));
15     printf("\n%f\n",*mxGetPr(mat_data));
16         
17     int status, num; 
18     pmat = matOpen(file, "w4");    
19     for(num=1; num<4; num++) {
20         char pnum[]  = {(char)(num+48), '\0'};
21         char pLD[13] = "LocalDouble";
22         status = matPutVariable(pmat, strcat(pLD,pnum), mat_data);
23     }
24       if (matClose(pmat) != 0) {
25         printf("Error closing file %s\n",file);
26         return(EXIT_FAILURE);
27       }
28     
29     mxDestroyArray(mat_data);
30     
31     double c;
32     c = 2*(a+b)+100;
33     return c;
34 
35 }

在matlab command window中操作如下：

>> mex addtiontest.c doublesize.c

>> addtiontest(7.5,15)7.500000ans =   145

>> load('mattest.mat')