Using python to create a .mat file with a cell array in it

Question

I'm trying to create a mat file with a cell it it. I tried to apply some solutions I found on the internet but non of them worked.

The code I'm wishing to have at the end is something like that:

import scipy.io as sio

l = [ [ [1,2,3], [4,5,6] ], [ [10, 20, 30] , [40, 50, 60] ] ]

c = # Some code to make it appear as a cell array in matlab

sio.savemat('f.mat', { cell : c })

so the cell array at the end would look like: [ [1,2,3], [4,5,6] ] [ [10, 20, 30] , [40, 50, 60] ]

I'd suggest creating a sample cell and or matrix in MATLAB, save it, and the look at what loadmat produces. numpy numeric dtype arrays transfer as matrix, though possibly with a change in order. I think cell are rendered as object dtype array in numpy. But experiment. — hpaulj
– hpaulj, Commented Jan 4, 2022 at 21:21
I tested it and you are right, np array that it's dtype is object creates a matlab cell. Thanks! — MeatBALL
– MeatBALL, Commented Jan 5, 2022 at 7:56

MeatBALL · Accepted Answer · 2022-01-05 11:32:07Z

2

To create a cell in a .mat file, the corresponding array in python should be a np.arrat whose dtype is np.object.

should look something like this:

import numpy as np
import scipy.io as sio
c = np.array( array, dtype=np.object)
sio.savemat('file.mat', '{'cell' : c})

credit to @hpaulj that commented this suggestion here, I checked it and it seems to work.

edited Jan 5, 2022 at 11:32

answered Jan 5, 2022 at 9:26

MeatBALL

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2 Comments

pippo1980 Over a year ago

what is np in your code ? A missing import ?

MeatBALL Over a year ago

@pippo1980 yes, np is a common short for numpy. added the import to the code.

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