problem loading matlab data with ompc and python
Hi, we're investigating transitioning our company from matlab to python. We
found OMPC as a MATLAB m-file-to Python translator, but we're encountering a
problem using the translated code to import MATLAB data structures into Python.
For example, when we save data within MATLAB this way:
x.a = 5;
x.b = 6;
save -v6 test x
this saves data in test.mat, with MATLAB version 6 compatibility (OMPC says
it's not compatible with the latest versions of MATLAB). The code to read in
data in MATLAB is just
load test
and when we run it through OMPC we get
load(mstring('test.mat'))
but when we run it we get the error message
File "ompclib\ompclib_numpy.py", line 1496, in load
KeyError: "[('a', '|O4'), ('b', '|O4')]"
Reading in simpler data (up to arrays) does not have this problem.
To get other people in the company to transition, we were hoping that the
translation process could be done in one step or on the fly. We could read in
MATLAB data using I/O functions imported from scipy, but then the transition
isn't seamless any more.
Is there a simple fix to using OMPC? Or a similar alternative that would work
better?
Thanks
--
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Re: problem loading matlab data with ompc and python
On Thursday, May 24, 2012 5:06:41 AM UTC-7, Tim Williams wrote:
> On May 23, 5:10 pm, no1 wrote:
> > Hi, we're investigating transitioning our company from matlab to python. We
> > found OMPC as a MATLAB m-file-to Python translator, but we're encountering
> > a problem using the translated code to import MATLAB data structures into
> > Python. For example, when we save data within MATLAB this way:
> >
> > x.a = 5;
> > x.b = 6;
> > save -v6 test x
> >
> > this saves data in test.mat, with MATLAB version 6 compatibility (OMPC says
> > it's not compatible with the latest versions of MATLAB). The code to read
> > in data in MATLAB is just
> >
> > load test
> >
> > and when we run it through OMPC we get
> >
> > load(mstring('test.mat'))
> >
> > but when we run it we get the error message
> >
> > File "ompclib\ompclib_numpy.py", line 1496, in load
> > KeyError: "[('a', '|O4'), ('b', '|O4')]"
> >
> > Reading in simpler data (up to arrays) does not have this problem.
> >
> > To get other people in the company to transition, we were hoping that the
> > translation process could be done in one step or on the fly. We could read
> > in MATLAB data using I/O functions imported from scipy, but then the
> > transition isn't seamless any more.
> >
> > Is there a simple fix to using OMPC? Or a similar alternative that would
> > work better?
> >
> > Thanks
>
> Have you tried using loadmat from the scipy.io module?
>
> http://docs.scipy.org/doc/scipy/reference/io.html
Yes (I mentioned the scipi I/O module near the end of my original post) but we
were hoping not to have to require the users to learn any Python to start. The
simpler the process, the less resistance to using the "new" Python methodology;
we were hoping the use of a single "black box" like translator (OMPC) would be
enough. We'd really like to avoid any additional steps for the user, like
rewriting code, otherwise the users are going to resist the transition.
--
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