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工作环境
1 A' z! H! y* y6 x" m- 软件环境：Windows 7 Ultimate sp1、MatlabR2012b 32bit
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今天在使用matlab实现svm算法的时候，发现使用svmtrain函数报错：
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立马help svmtrain看看是否少什么东西，命令执行结果如下：
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. r: k' w! [( o8 h% d P- help svmtrain
- svmtrain Train a support vector machine classifier
- SVMSTRUCT = svmtrain(TRAINING, Y) trains a support vector machine (SVM)
- classifier on data taken from two groups. TRAINING is a numeric matrix
- of predictor data. Rows of TRAINING correspond to observations; columns
- correspond to features. Y is a column vector that contains the known
- class labels for TRAINING. Y is a grouping variable, i.e., it can be a
- categorical, numeric, or logical vector; a cell vector of strings; or a
- character matrix with each row representing a class label (see help for
- groupingvariable). Each element of Y specifies the group the
- corresponding row of TRAINING belongs to. TRAINING and Y must have the
- same number of rows. SVMSTRUCT contains information about the trained
- classifier, including the support vectors, that is used by SVMCLASSIFY
- for classification. svmtrain treats NaNs, empty strings or 'undefined'
- values as missing values and ignores the corresponding rows in
- TRAINING and Y.
- ........
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于是，网上找找资料，这一找不得了，发现大问题！按照参考文献的思路，应该是我的Matlab少了libsvm库，搞不好这个问题无解。幸好libsvm不是matlab自带的，而是需要下载编译的，需要的朋友可以从这https://www.csie.ntu.edu.tw/~cjlin/libsvm/下载。" L) ]' j) _! A6 _/ O0 n
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下载下来的是源代码，需要经过编译，查看README.md，可以发现：
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- Example:
- matlab>> mex -setup
- (ps: MATLAB will show the following messages to setup default compiler.)
- Please choose your compiler for building external inteRFace (MEX) files:
- Would you like mex to locate installed compilers [y]/n? y
- Select a compiler:
- [1] Microsoft Visual C/C++ version 7.1 in C:\Program Files\Microsoft Visual Studio
- [0] None
- Compiler: 1
- Please verify your choices:
- Compiler: Microsoft Visual C/C++ 7.1
- Location: C:\Program Files\Microsoft Visual Studio
- Are these correct?([y]/n): y
- matlab>> make
- On Unix systems, if neither make.m nor 'mex -setup' works, please use
- Makefile and type 'make' in a command window. Note that we assume
- your MATLAB is installed in '/usr/local/matlab'. If not, please change
- MATLABDIR in Makefile.
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于是赶紧将libsvm压缩包扔到matlab/toolbox/下面，然后定位到libsvm3.23文件夹，输入mex -setup，
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- Select a compiler:
- [1] Lcc-win32 C 2.4.1 in E:\1_PROG~1\MATLAB~1\sys\lcc
- [0] None
- Compiler: mex -setup
- Please select from 0-1
- Compiler:
- Please select from 0-1
- Compiler: 1
- Please verify your choices:
- Compiler: Lcc-win32 C 2.4.1
- Location: E:\1_PROG~1\MATLAB~1\sys\lcc
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# Z7 _: s" U+ v* E0 J" g只有一个编译器！也就是matlab自带的编译器，于是只能选择该编译器，输入make，出来一堆错误：
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+ E: f1 i) [3 i+ a) h0 `: m- >> make
- Error ..\svm.cpp: 15 syntax error; found `<' expecting `;'
- Error ..\svm.cpp: 15 skipping `<'
- Error ..\svm.cpp: 15 syntax error; found `T' expecting `;'
- Error ..\svm.cpp: 15 syntax error; found `>' expecting `;'
- Error ..\svm.cpp: 15 skipping `>'
- Error ..\svm.cpp: 15 syntax error; found `T' expecting `;'
- Error ..\svm.cpp: 15 syntax error; found `min' expecting `;'
- Error ..\svm.cpp: 15 syntax error; found `x' expecting `)'
- Error ..\svm.cpp: 15 skipping `x' `,' `T' `y'
- Error ..\svm.cpp: 15 undeclared identifier `x'
- Error ..\svm.cpp: 15 undeclared identifier `y'
- Warning ..\svm.cpp: 15 possible usage of x before definition
- Warning ..\svm.cpp: 15 possible usage of y before definition
- Error ..\svm.cpp: 18 syntax error; found `<' expecting `;'
- Error ..\svm.cpp: 18 skipping `<'
- Error ..\svm.cpp: 18 syntax error; found `T' expecting `;'
- Error ..\svm.cpp: 18 syntax error; found `>' expecting `;'
- Error ..\svm.cpp: 18 skipping `>'
- Error ..\svm.cpp: 18 syntax error; found `T' expecting `;'
- Error ..\svm.cpp: 18 syntax error; found `max' expecting `;'
- Error ..\svm.cpp: 18 syntax error; found `x' expecting `)'
- Error ..\svm.cpp: 18 skipping `x' `,' `T' `y'
- Error ..\svm.cpp: 18 too many errors
- E:\1_PROG~1\MATLAB~1\BIN\MEX.PL: Error: Compile of '..\svm.cpp' failed.
- Error: E:\1_Program_File\MatlabR2012b\toolbox\matlab\general\mex.m failed (line 206)
- Unable to complete successfully.
- => Please check README for detailed instructions.' ?4 t! L/ f( ]$ ~
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原因是lcc 编译器不支持c++，要使得matlab能够编译c++文件的话，只能安装第三方编译器比如微软的vsstudio或者vc++6.0以及mingw-w64，由于vs或者vc比较大我就没再折腾，倒是下载了mingw-w64的离线版，（在线安装版本下载不下来），但是离线版下载下来之后解压缩，死活都配置不好，matlab中就是不显示该编译器！我电脑中其实也有一个cl编译器也不了解如何去配置。最后无果，只能找一个编译好的libsvm32位版本，据说是在winxp下面编译的，通用性应该不错，试了试，可以成功运行！9 ?9 h! _' a% y$ }$ M9 u
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发表于 2020-3-9 10:44
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