經過 Python 調用 MATLAB 函數

MATLB安裝於/opt/local/MATLAB/R2017a目錄

1、Python安裝MATLAB引擎

爲了避免「污染」MATLAB，先創建engines/python的備份(兩個分別用於python2，python3)

sudo chmod a+rw /opt/local/MATLAB/R2017a/extern/engines
cp -Rf /opt/local/MATLAB/R2017a/extern/engines/python /opt/local/MATLAB/R2017a/extern/engines/python-27
cp -Rf /opt/local/MATLAB/R2017a/extern/engines/python /opt/local/MATLAB/R2017a/extern/engines/python-35
sudo chmod 755 /opt/local/MATLAB/R2017a/extern/engines

安裝：

cd /opt/local/MATLAB/R2017a/extern/engines/python-27
python setup.py build 
sudo python setup.py install

這裏安裝的是Python2，安裝python3以下：

cd /opt/local/MATLAB/R2017a/extern/engines/python-35
python3 setup.py build 
sudo python3 setup.py install

2、驗證：

pip list一下發現有下面這個模塊了：

matlabengineforpython         R2017a

3、使用（調用MATLAB內置函數isprime）

~$ python
Python 2.7.12 (default, Dec  4 2017, 14:50:18) 
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import matlab.engine
>>> eng = matlab.engine.start_matlab()
>>> tf = eng.isprime(37)
>>> print(tf)
True
>>>

4、MATLAB中調用python函數

MATLAB R2015a 開始支持直接調用 Python：

>> pyversion

       version: '2.7'
    executable: '/usr/bin/python'
       library: 'libpython2.7.so.1.0'
          home: '/usr'
      isloaded: 0

>> py.print('Hello world!')
Hello world!
>> py.sum([0,1,2])

ans =

     3

>> py.print(py.pow(int32(2), int32(1000)))
10715086071862673209484250490600018105614048117055336074437503883703510511249361224931983788156958581275946729175531468251871452856923140435984577574698574803934567774824230985421074605062371141877954182153046474983581941267398767559165543946077062914571196477686542167660429831652624386837205668069376
>>

導入.py文件(用edit命令建立test1.py)：

>> edit test1.py
>> py.test1.c1(4,7)

ans =

    11

>>

其中test1.py的內容以下：

def c1(a1,b1):
	c=a1+b1
	return c

但有時import有些模塊會出現libstdc++.so.6版本不對的狀況，如py.importlib.import_module('cv2')

/opt/local/MATLAB/R2017a/bin/glnxa64/../../sys/os/glnxa64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found

依賴GLIBCXX_3.4.21，但Matlab自帶的那個最高支持到GLIBCXX_3.4.20

$ strings /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.25|grep GLIBC
GLIBCXX_3.4
GLIBCXX_3.4.1
GLIBCXX_3.4.2
GLIBCXX_3.4.3
GLIBCXX_3.4.4
GLIBCXX_3.4.5
GLIBCXX_3.4.6
GLIBCXX_3.4.7
GLIBCXX_3.4.8
GLIBCXX_3.4.9
GLIBCXX_3.4.10
GLIBCXX_3.4.11
GLIBCXX_3.4.12
GLIBCXX_3.4.13
GLIBCXX_3.4.14
GLIBCXX_3.4.15
GLIBCXX_3.4.16
GLIBCXX_3.4.17
GLIBCXX_3.4.18
GLIBCXX_3.4.19
GLIBCXX_3.4.20
GLIBCXX_3.4.21
GLIBCXX_3.4.22
GLIBCXX_3.4.23
GLIBCXX_3.4.24
GLIBCXX_3.4.25
GLIBC_2.2.5
GLIBC_2.3
GLIBC_2.14
GLIBC_2.4
GLIBC_2.18
GLIBC_2.16
GLIBC_2.3.4
GLIBC_2.17
GLIBC_2.3.2
GLIBCXX_DEBUG_MESSAGE_LENGTH

$ strings /opt/local/MATLAB/R2017a/sys/os/glnxa64/libstdc++.so.6.0.20|grep GLIBC
GLIBCXX_3.4
GLIBCXX_3.4.1
GLIBCXX_3.4.2
GLIBCXX_3.4.3
GLIBCXX_3.4.4
GLIBCXX_3.4.5
GLIBCXX_3.4.6
GLIBCXX_3.4.7
GLIBCXX_3.4.8
GLIBCXX_3.4.9
GLIBCXX_3.4.10
GLIBCXX_3.4.11
GLIBCXX_3.4.12
GLIBCXX_3.4.13
GLIBCXX_3.4.14
GLIBCXX_3.4.15
GLIBCXX_3.4.16
GLIBCXX_3.4.17
GLIBCXX_3.4.18
GLIBCXX_3.4.19
GLIBCXX_3.4.20
GLIBC_2.3
GLIBC_2.2.5
GLIBC_2.3.2
.........

解決方法把/opt/local/MATLAB/R2017a/sys/os/glnxa64/libstdc++.so.6連接改過來（比較粗暴的作法，暫時沒發現matlab運行有問題）

sudo rm /opt/local/MATLAB/R2017a/sys/os/glnxa64/libstdc++.so.6
sudo ln -s /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.25 /opt/local/MATLAB/R2017a/sys/os/glnxa64/libstdc++.so.6

不行再改回來
sudo rm /opt/local/MATLAB/R2017a/sys/os/glnxa64/libstdc++.so.6
sudo ln -s /opt/local/MATLAB/R2017a/sys/os/glnxa64/libstdc++.so.6.0.20 /opt/local/MATLAB/R2017a/sys/os/glnxa64/libstdc++.so.6