`scipy.io.matlab._mio:savemat`

Signature

def savemat(file_name, mdict, appendmat = True, format = 5, long_field_names = False, do_compression = False, oned_as = row)

Save a dictionary of names and arrays into a MATLAB-style .mat file.

This saves the array objects in the given dictionary to a MATLAB- style .mat file.

file_name : str or file-like object: Name of the .mat file (.mat extension not needed if appendmat == True). Can also pass open file_like object.
mdict : dict: Dictionary from which to save matfile variables. Note that if this dict has a key starting with _ or a sub-dict has a key starting with _ or a digit, these key's items will not be saved in the mat file and MatWriteWarning will be issued.
appendmat : bool, optional: True (the default) to append the .mat extension to the end of the given filename, if not already present.
format : {'5', '4'}, string, optional: '5' (the default) for MATLAB 5 and up (to 7.2), '4' for MATLAB 4 .mat files.
long_field_names : bool, optional: False (the default) - maximum field name length in a structure is 31 characters which is the documented maximum length. True - maximum field name length in a structure is 63 characters which works for MATLAB 7.6+.
do_compression : bool, optional: Whether or not to compress matrices on write. Default is False.
oned_as : {'row', 'column'}, optional: If 'column', write 1-D NumPy arrays as column vectors. If 'row', write 1-D NumPy arrays as row vectors.

from scipy.io import savemat
import numpy as np
a = np.arange(20)
mdic = {"a": a, "label": "experiment"}

✓

mdic

✗

{'a': array([ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16,
       17, 18, 19]), 'label': 'experiment'}

savemat("matlab_matrix.mat", mdic)