convert a Python tuple containing string and numerical data types to Matlab

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Dominique Nguyen
Dominique Nguyen 2020-3-8
评论： Stephen23 2024-11-13，9:37
How do I convert the following tuple in python and save it to a "test.mat" file so that I can load and read it in Matlab:
py_tuple = [('cars', 'gm', [['red', 10],['black', 15]]),
('cars', 'ford', ['green',5]),
('cars', 'honda', [])]
  1 个评论
Stephen23
Stephen23 2024-11-13，9:37
Ran in:
"How do I convert the following tuple in python and save it to a "test.mat" file so that I can load and read it in Matlab:"
Unless you really enjoy fiddling around with files, why not simply access the data directly from MATLAB?:
L = pyrun("x = [('cars', 'gm', [['red', 10],['black', 15]]), ('cars', 'ford', ['green',5]), ('cars', 'honda', [])]","x")
L =
Python list with values: [('cars', 'gm', [['red', 10], ['black', 15]]), ('cars', 'ford', ['green', 5]), ('cars', 'honda', [])] Use string, double or cell function to convert to a MATLAB array.
L{1}
ans =
Python tuple with values: ('cars', 'gm', [['red', 10], ['black', 15]]) Use string, double or cell function to convert to a MATLAB array.
L{2}
ans =
Python tuple with values: ('cars', 'ford', ['green', 5]) Use string, double or cell function to convert to a MATLAB array.
L{3}
ans =
Python tuple with values: ('cars', 'honda', []) Use string, double or cell function to convert to a MATLAB array.
etc.
https://www.mathworks.com/help/matlab/matlab_external/ways-to-call-python-from-matlab.html
https://www.mathworks.com/help/matlab/matlab_external/accessing-elements-in-python-container-types.html

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回答（2 个）

Rajani Mishra
Rajani Mishra 2020-3-11
You can either save the data as
1)Python tuple itself in .mat file. For that you have to create a variable of type “py.tuple()” in MATLAB. For more information refer: https://www.mathworks.com/help/matlab/python-data-types.html?s_tid=CRUX_lftnav
Example:
myTuple = py.tuple({'red',10});
myTuple2 = py.tuple({'cars','gm',tuple});
2) Create a cell array with the same elements and store and load it from a mat file. As cell also supports different data types like tuples to be stored. For creating a cell array refer below:
https://www.mathworks.com/help/matlab/ref/cell.html
For saving and loading from a mat file refer to this link: https://www.mathworks.com/help/matlab/matlab_env/save-load-and-delete-workspace-variables.html
Al Danial
Al Danial 2022-4-20
The SciPy module has a function, savemat, which can write Python variables to MATLAB .m files. Your tuple can be written to test.mat with
from scipy.io import savemat
py_tuple = [('cars', 'gm', [['red', 10],['black', 15]]),
('cars', 'ford', ['green',5]),
('cars', 'honda', [])]
M = { 'py_tuple' : py_tuple }
savemat('test.mat', M)
Loading test.mat in MATLAB gives
>> t = load('test.mat');
>> t.py_tuple
ans =
3×3 cell array
{'cars'} {'gm' } {2×2×21 char }
{'cars'} {'ford' } {2×21 char }
{'cars'} {'honda'} {0×0 double}
Section 7.14 of Python for MATLAB Development covers reading and writing .mat files to/from Python in detail.

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