Hello,
I am trying to load some .mat files in python, that were saved with octave. I
get
some weird things with strings, and structs fail altogether. Am I doing
something
wrong? Python 2.4, Scipy '0.4.9.1906', numpy 0.9.8, octave 2.1.71, running
Linux.
thanks,
Brian Blais
here is what I tried:
Numbers are ok:
========OCTAVE==========
>> a=rand(4)
a =
0.617860 0.884195 0.032998 0.217922
0.207970 0.753992 0.333966 0.905661
0.048432 0.290895 0.353919 0.958442
0.697213 0.616851 0.426595 0.371364
>> save -mat-binary pythonfile.mat a
=========PYTHON===========
In [13]:d=io.loadmat('pythonfile.mat')
In [14]:d
Out[14]:
{'__header__': 'MATLAB 5.0 MAT-file, written by Octave 2.1.71,
2006-06-09
14:23:54 UTC',
'__version__': '1.0',
'a': array([[ 0.61785957, 0.88419484, 0.03299807, 0.21792207],
[ 0.20796989, 0.75399171, 0.33396634, 0.90566095],
[ 0.04843219, 0.29089527, 0.35391921, 0.95844178],
[ 0.69721313, 0.61685075, 0.42659485, 0.37136358]])}
Strings are weird (turns to all 1's)
========OCTAVE==========
>> a='hello'
a = hello
>> save -mat-binary pythonfile.mat a
=========PYTHON===========
In [15]:d=io.loadmat('pythonfile.mat')
In [16]:d
Out[16]:
{'__header__': 'MATLAB 5.0 MAT-file, written by Octave 2.1.71,
2006-06-09
14:24:13 UTC',
'__version__': '1.0',
'a': '11111'}
Cell arrays are fine (except for strings):
========OCTAVE==========
>> a={5 [1,2,3] 'this'}
a =
{
[1,1] = 5
[1,2] =
1 2 3
[1,3] = this
}
>> save -mat-binary pythonfile.mat a
=========PYTHON===========
In [17]:d=io.loadmat('pythonfile.mat')
In [18]:d
Out[18]:
{'__header__': 'MATLAB 5.0 MAT-file, written by Octave 2.1.71,
2006-06-09
14:24:51 UTC',
'__version__': '1.0',
'a': array([5.0, [ 1. 2. 3.], 1111], dtype=object)}
Structs crash:
========OCTAVE==========
>> clear a
>> a.hello=5
a =
{
hello = 5
}
>> a.this=[1,2,3]
a =
{
hello = 5
this =
1 2 3
}
>> save -mat-binary pythonfile.mat a
=========PYTHON===========
In [19]:d=io.loadmat('pythonfile.mat')
---------------------------------------------------------------------------
exceptions.AttributeError Traceback (most
recent
call last)
/home/bblais/octave/work/mouse/<console>
/usr/lib/python2.4/site-packages/scipy/io/mio.py in loadmat(name, dict,
appendmat, basename)
751 if not (0 in test_vals): # MATLAB version 5 format
752 fid.rewind()
--> 753 thisdict = _loadv5(fid,basename)
754 if dict is not None:
755 dict.update(thisdict)
/usr/lib/python2.4/site-packages/scipy/io/mio.py in _loadv5(fid,
basename)
688 try:
689 var = var + 1
--> 690 el, varname = _get_element(fid)
691 if varname is None:
692 varname = '%s_%04d' % (basename,var)
/usr/lib/python2.4/site-packages/scipy/io/mio.py in _get_element(fid)
676
677 # handle miMatrix type
--> 678 el, name = _parse_mimatrix(fid,numbytes)
679 return el, name
680
/usr/lib/python2.4/site-packages/scipy/io/mio.py in
_parse_mimatrix(fid, bytes)
597 result[i].__dict__[element] = val
598 result = squeeze(transpose(reshape(result,tupdims)))
--> 599 if rank(result)==0: result = result.item()
600
601 # object is like a structure with but with a class name
AttributeError: mat_struct instance has no attribute 'item'
--
-----------------
[EMAIL PROTECTED]
http://web.bryant.edu/~bblais
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