How to read matlab datetimes stored in a file using scipy.io.loadmat

Asked Jan 31 '18 at 12:52

Active Jan 31 '18 at 12:58

Viewed 1,256 times

I have a -v7 file myfilename which I created in matlab. It contains a nested structure, which contains a UTC timestamp

 mydata.sub1.time_utc(1)
ans = 
   31-Jan-2018 09:25:52
    class(s.sub1.time_utc)
ans =
datetime

I open the file via python, using scipy

matlabcontents=scipy.io.loadmat(fn_full)

then I can access all of my struct but not the time_utc but then I can not see inspecting the object

matlabcontents['mydata']['sub1']

I can not see the 'time_utc' in the fields.

I also have tried :

matlabcontents=scipy.io.loadmat(myfilename ,squeeze_me=True,struct_as_record=False)
matlabcontents['mydata'].__dict__['sub1'].__dict__['time_utc']

This way I can access 'time_utc', but I get the following which is indeed 'opaque' to me

MatlabOpaque([ ('', 'MCOS', 'datetime', array([3707764736,          2,          1,          1,          1,
                1], dtype=uint32))], 
      dtype=[('s0', 'O'), ('s1', 'O'), ('s2', 'O'), ('arr', 'O')])

How to access matlab datetimes from python?

edited Jan 31 '18 at 12:58

Mukul Kant

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asked Jan 31 '18 at 12:52

00__00__00

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1

Save them in string format instead. Datetime is a Matlab specific type that is probably not handled in loadmat. – Tommaso Belluzzo Jan 31 '18 at 12:58
do you have a one-line for me to do that? – 00__00__00 Jan 31 '18 at 13:02
2

t = datetime('now'); s = datestr(t); – Tommaso Belluzzo Jan 31 '18 at 13:29
1

An earlier SO question with `MatlabOpaque` objects, https://stackoverflow.com/questions/32913301/matlab-date-string-results-in-java-lang-string-in-python-scipy-io – hpaulj Jan 31 '18 at 18:46

How to read matlab datetimes stored in a file using scipy.io.loadmat

0 Answers0