Error creating python application with MATLAB code (LD_LIBRARY_PATH)

Question

I read the following instructions in order to create a python application using matlab code: Create a Python Application with MATLAB Code

Everything is ok, when I execute the commandpython setup.py install the following message shows up:

root@david:/home/david/Desktop/Matrices_Clifford/for_redistribution_files_only# python setup.py install
running install
running build
running build_py
creating build
creating build/lib.linux-x86_64-2.7
creating build/lib.linux-x86_64-2.7/Matrices_Clifford
copying Matrices_Clifford/__init__.py -> build/lib.linux-x86_64-2.7/Matrices_Clifford
copying Matrices_Clifford/Matrices_Clifford.ctf -> build/lib.linux-x86_64-2.7/Matrices_Clifford
running install_lib
creating /usr/local/lib/python2.7/dist-packages/Matrices_Clifford
copying build/lib.linux-x86_64-2.7/Matrices_Clifford/Matrices_Clifford.ctf -> /usr/local/lib/python2.7/dist-packages/Matrices_Clifford
copying build/lib.linux-x86_64-2.7/Matrices_Clifford/__init__.py -> /usr/local/lib/python2.7/dist-packages/Matrices_Clifford
byte-compiling /usr/local/lib/python2.7/dist-packages/Matrices_Clifford/__init__.py to __init__.pyc
running install_egg_info
Removing /usr/local/lib/python2.7/dist-packages/matlabruntimeforpython-R2017a.egg-info
Writing /usr/local/lib/python2.7/dist-packages/matlabruntimeforpython-R2017a.egg-info
removing 'build/lib.linux-x86_64-2.7' (and everything under it)
'build/bdist.linux-x86_64' does not exist -- can't clean it
'build/scripts-2.7' does not exist -- can't clean it
removing 'build'

Then, when I try to import Matrices_Clifford there is an error:

import Matrices_Clifford
    Exception caught during initialization of Python interface. Details: On Linux, you must set the environment variable "LD_LIBRARY_PATH" to a non-empty string. For more details, see the package documentation.
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "Matrices_Clifford/__init__.py", line 276, in <module>
        _pir.get_paths_from_os()
      File "Matrices_Clifford/__init__.py", line 171, in get_paths_from_os
        friendly_os_name, self.path_var, 'For more details, see the package documentation.'))
    RuntimeError: On Linux, you must set the environment variable "LD_LIBRARY_PATH" to a non-empty string. For more details, see the package documentation.

How can I fix this problem?

Tommaso Belluzzo · Accepted Answer · 2018-02-17 19:21:04Z

1

The error is quite self-explanatory. The environment variable LD_LIBRARY_PATH must be defined so that the operating system knows the location of the libraries. Use the setenv command to define it properly, as follows:

setenv LD_LIBRARY_PATH path/to/libraries

It seems that this link can point you to the right path (no pun intended) and that the required location is in the form of matlabroot/bin/glnxa64:matlabroot/sys/os/glnxa64.

answered Feb 17, 2018 at 19:21

Tommaso Belluzzo

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1 Comment

paime Over a year ago

For me (MATLAB R2022a Linux) it was export LD_LIBRARY_PATH="$MATLABROOT/runtime/glnxa64"

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