How to save a list of python dictionaries as an array of matlab structured arrays?

Question

I am trying to create a file to be read in a matlab enviroment. The structure in matlab looks like this

trx(1) = 
          x: [1×1500 double]
          y: [         


        

Answer 1

In Octave

M =

  scalar structure containing the fields:

    x =

       1   2   3   4

    y =

       5   6   7   8

    one =  1
    two =

       1   2

>> save -7 struct.mat M

In Ipython:

In [450]: dat = io.loadmat('struct.mat')
In [451]: dat
Out[451]: 
{'__header__': b'MATLAB 5.0 MAT-file, written by Octave 4.2.2, 2019-02-08 18:49:49 UTC',
 '__version__': '1.0',
 '__globals__': [],
 'M': array([[(array([[1., 2., 3., 4.]]), array([[5., 6., 7., 8.]]), array([[1.]]), array([[1., 2.]]))]],
       dtype=[('x', 'O'), ('y', 'O'), ('one', 'O'), ('two', 'O')])}

Here M is (1,1) structured array, with all fields being object dtype. That way they can each have their own shape. The scalar is a (1,1) matrix.