test1.py contains:

```
import sys
print 'ok'

```

test2.py contains:

```
import sys
import numpy as np
print 'ok'

```

Both `python test1.py` and `python test2.py` work fine.

When I'm in MATLAB, `system('python test1.py')` works while `system('python test2.py')` doesn't work and throw the following error message:

```
>> system('python test2.py')
Traceback (most recent call last):
  File "test.py", line 3, in <module>
    import numpy as np
  File "/usr/lib/python2.7/dist-packages/numpy/__init__.py", line 137, in <module>
    import add_newdocs
  File "/usr/lib/python2.7/dist-packages/numpy/add_newdocs.py", line 9, in <module>
    from numpy.lib import add_newdoc
  File "/usr/lib/python2.7/dist-packages/numpy/lib/__init__.py", line 13, in <module>
    from polynomial import *
  File "/usr/lib/python2.7/dist-packages/numpy/lib/polynomial.py", line 17, in <module>
    from numpy.linalg import eigvals, lstsq
  File "/usr/lib/python2.7/dist-packages/numpy/linalg/__init__.py", line 48, in <module>
    from linalg import *
  File "/usr/lib/python2.7/dist-packages/numpy/linalg/linalg.py", line 23, in <module>
    from numpy.linalg import lapack_lite
ImportError: /afs/csail.mit.edu/system/common/matlab/2012a/sys/os/glnxa64/libgfortran.so.3: version `GFORTRAN_1.4' not found (required by /usr/lib/liblapack.so.3gf)

```

Full stack:

![enter image description here](https://i.stack.imgur.com/JOfPk.png)

I use Matlab 2012a x64 on Ubuntu 12.04 with Python 2.7. Any idea why Python called from MATLAB fails to import non-standard Python libraries (here Numpy, but I had the same issue with Scipy)? Note that everything works fine on my Windows computer.