【发布时间】：2014-02-28 16:43:11
【问题描述】：
我是 libsvm 和 matlab 的新手。我已经从网站下载了 libsvm 3.17 并使用 Matlab 训练了我的数据集。我想保存文件，我使用了 svm_savemodel.c 拒绝在 matlab 中编译。这是我收到的信息
mex svm_savemodel.c
Creating library C:\Users\mark\AppData\Local\Temp\mex_zcr67j\templib.x and object C:\Users\mark\AppData\Local\Temp\mex_zcr67j\templib.exp
svm_savemodel.obj : error LNK2019: unresolved external symbol _svm_free_and_destroy_model referenced in function _mexFunction
svm_savemodel.obj : error LNK2019: unresolved external symbol _svm_save_model referenced in function _mexFunction
svm_savemodel.obj : error LNK2019: unresolved external symbol _matlab_matrix_to_model referenced in function _mexFunction
svm_savemodel.mexw32 : fatal error LNK1120: 3 unresolved externals
C:\PROGRA~1\MATLAB\R2011B\BIN\MEX.PL: Error: Link of 'svm_savemodel.mexw32' failed.
Error using mex (line 206)
Unable to complete successfully.
那么谁能帮我解决这个问题？ 我已经包含了 svm.h、mex.h、svm_model_matlab.h 但它拒绝了....
这就是我所做的
>> mex -setup
Welcome to mex -setup. This utility will help you set up
a default compiler. For a list of supported compilers, see
http://www.mathworks.com/support/compilers/R2011b/win32.html
Please choose your compiler for building MEX-files:
Would you like mex to locate installed compilers [y]/n? y
Select a compiler:
[1] Lcc-win32 C 2.4.1 in C:\PROGRA~1\MATLAB\R2011b\sys\lcc
[2] Microsoft Visual C++ 2010 in C:\Program Files\Microsoft Visual Studio 10.0
[0] None
Compiler: 2
Please verify your choices:
Compiler: Microsoft Visual C++ 2010
Location: C:\Program Files\Microsoft Visual Studio 10.0
Are these correct [y]/n? y
***************************************************************************
Warning: MEX-files generated using Microsoft Visual C++ 2010 require
that Microsoft Visual Studio 2010 run-time libraries be
available on the computer they are run on.
If you plan to redistribute your MEX-files to other MATLAB
users, be sure that they have the run-time libraries.
***************************************************************************
Trying to update options file: C:\Users\michael\AppData\Roaming\MathWorks\MATLAB\R2011b\mexopts.bat
From template: C:\PROGRA~1\MATLAB\R2011b\bin\win32\mexopts\msvc100opts.bat
Done . . .
**************************************************************************
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.
**************************************************************************
>> cd('C:\libsvm-3.17\libsvm-3.17\matlab');
>> make
>> mex svm_savemodel.c
Creating library C:\Users\michael\AppData\Local\Temp\mex_coX2K1\templib.x and object C:\Users\michael\AppData\Local\Temp\mex_coX2K1\templib.exp
svm_savemodel.obj : error LNK2019: unresolved external symbol _svm_free_and_destroy_model referenced in function _mexFunction
svm_savemodel.obj : error LNK2019: unresolved external symbol _svm_save_model referenced in function _mexFunction
svm_savemodel.obj : error LNK2019: unresolved external symbol _matlab_matrix_to_model referenced in function _mexFunction
svm_savemodel.mexw32 : fatal error LNK1120: 3 unresolved externals
C:\PROGRA~1\MATLAB\R2011B\BIN\MEX.PL: Error: Link of 'svm_savemodel.mexw32' failed.
Error using mex (line 206)
Unable to complete successfully.
>>
【问题讨论】：
-
您是否阅读了有关如何构建库的文档。如果不是，我强烈推荐它。 github.com/cjlin1/libsvm/tree/master/matlab 我也针对任何关于 SO 的进一步问题提出此建议。在提出可以通过这样做轻松回答的问题之前阅读文档。
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是的，我已阅读在 ZIP 中找到的 README 文件。实际上，在 matlab 文件夹中找到的其他 C 文件编译成功。正是这个文件返回了这个错误。
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仅供参考，我使用的是 libsvm 3.17、matlab R2011B 和 Microsoft Visual C++ 2010 编译器。
-
我使用了svm_savemodel.c 文件。
标签： c++ matlab machine-learning libsvm