Wrong interpretation of a logical array with a length of 1 in loadmat

[rubencalje]

If I save a logical array in matlab with a length of 1 and a value of false, scipy.io.loadmat resturns an array with a value of True. This bug does not happen when the length of the logical array is larger than 1.

Reproducing code example:

In MATLAB I save a logical array with:

test = false;
save test.mat test

In Python, I then load the mat-file with:

import scipy.io as sio
mat = sio.loadmat('test.mat',matlab_compatible=True)

Error message:

This results in the following object in python

{'__globals__': [],
 '__header__': b'MATLAB 5.0 MAT-file, Platform: PCWIN, Created on: Fri Mar 16 15:05:58 2018',
 '__version__': '1.0',
 'test': array([[ True]])}

As you can see, the value is now suddenly True. When I turn off matlab_compatible in loadmat, the value of 'test' will be 2, which is also incorrect.

Scipy/Numpy/Python version information:

1.0.0 1.14.0 sys.version_info(major=3, minor=6, micro=4, releaselevel='final', serial=0)