varmats_from_mat — SciPy v1.15.2 Manual (original) (raw)

scipy.io.matlab.

scipy.io.matlab.varmats_from_mat(file_obj)[source]#

Pull variables out of mat 5 file as a sequence of mat file objects

This can be useful with a difficult mat file, containing unreadable variables. This routine pulls the variables out in raw form and puts them, unread, back into a file stream for saving or reading. Another use is the pathological case where there is more than one variable of the same name in the file; this routine returns the duplicates, whereas the standard reader will overwrite duplicates in the returned dictionary.

The file pointer in file_obj will be undefined. File pointers for the returned file-like objects are set at 0.

Parameters:

file_objfile-like

file object containing mat file

Returns:

named_matslist

list contains tuples of (name, BytesIO) where BytesIO is a file-like object containing mat file contents as for a single variable. The BytesIO contains a string with the original header and a single var. Ifvar_file_obj is an individual BytesIO instance, then save as a mat file with something like open('test.mat', 'wb').write(var_file_obj.read())

Examples

import scipy.io import numpy as np from io import BytesIO from scipy.io.matlab._mio5 import varmats_from_mat mat_fileobj = BytesIO() scipy.io.savemat(mat_fileobj, {'b': np.arange(10), 'a': 'a string'}) varmats = varmats_from_mat(mat_fileobj) sorted([name for name, str_obj in varmats]) ['a', 'b']