load .mat file from python

Question

I am trying to run from Python a script in Matlab that run a Simulink mode, save a variable as Power.mat and read this variable in Python. I am using Python 2.7 on Windows.

I've tried to use the library hdf5storage to read the file:

import hdf5storage
x=hdf5storage.loadmat('Power.mat','r')

but I get the error attached. error

Which could be the problem? I have also tried with the library h5py but I get the same error. The file .mat seems not to be corrupted since I open it without any problem in Matlab.

Thanks!

x=hdf5storage.loadmat('Power.mat') should work, although it takes forever to download the packages necessary to test it :) — Jean-François Fabre
– Jean-François Fabre ♦, Commented Oct 13, 2016 at 8:12
Did you save Power.mat as a version 7.3 MAT file? Previous versions are not HDF5. From MATLAB: type('Power.mat') will tell you the MAT file version. Use save('Power.mat', '-v7.3') to specify the version. — smn
– smn, Commented Oct 13, 2016 at 8:22

minhduc · Accepted Answer · 2016-10-13 08:06:16Z

3

You can use scipy.io to exchange data between Python and Matlab. There are functions named savemat and loadmat for this purpose.

Something like this should work:

import scipy.io
mat = scipy.io.loadmat('Power.mat')

For reference, http://docs.scipy.org/doc/scipy/reference/generated/scipy.io.loadmat.html

answered Oct 13, 2016 at 8:06

minhduc

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TheBlackCat Over a year ago

There are four different .mat file formats. The first three, v4, v6, and v7, are proprietary binary formats. Those are what scipy can open. The last, v7.3, is a specialized hdf5 file. That is what hdf5storage can open. Technically it can be opened by anything that can handle hdf5 files, but hdf5storage has some tools to gracefully handle the MATLAB-specific bits. Otherwise you get a pretty ugly (but still ultimately usable) output.

Fabich · Accepted Answer · 2016-10-13 08:23:23Z

0

Try this code :

import h5py
Data = h5py.File('File.mat')

edited Oct 13, 2016 at 8:23

Fabich

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answered Oct 13, 2016 at 8:06

RVK

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1 Comment

raaj Over a year ago

This is useless, it just gives me a bunch of hd5 reference objects. I can't do anything with them

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