How to pass a structure from Matlab to Python

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Jason Shih
Jason Shih 2015-7-3
回答： Jason Shih 2015-7-8
I'm using Matlab(2014b) and Python(2.7.6) for mix programming. I tried to pass a structure from Matlab to Python,but I failed.
The structure I want to pass is:
dmodel = struct('regr',regr, 'corr',corr, 'theta',theta.', ...
'beta',fit.beta, 'gamma',fit.gamma, 'sigma2',sY.^2.*fit.sigma2, ...
'S',S, 'Ssc',[mS; sS], 'Ysc',[mY; sY], ...
'C',fit.C, 'Ft',fit.Ft, 'G',fit.G);
In the structure all the elements are scalar except Ssc and Ysc.
The Matlab script looks like this:
function model=Fun_mat()
...
some command;
...
model = dmodel;
end
and the Python script looks like this:
import matlab.engine as meng
eng = meng.start_matlab()
dmodel = eng.Fun_mat()
eng.quit()
These two scripts are in the same directory.
What should I do? Any help is appreciate!

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采纳的回答

Gareth Thomas
Gareth Thomas 2015-7-5
Hi Jason,
Have you seen this page in the R2015a documentation:
MathWorks Documentation: Handle Data returned from MATLAB to Python
Please note that this is used for the MATLAB engine which can be called from python. I hope that this helps you.
Best regards, Gareth
  1 个评论
Jason Shih
Jason Shih 2015-7-6
编辑：Jason Shih 2015-7-6
Hi Gareth,
Thanks for your reply. I have read that document before, but I still have some problems.
The structure I want is
dmodel =
regr: 1
corr: 2
theta: [0.4419 0.1091]
beta: [6x1 double]
gamma: [1x100 double]
sigma2: 949.8115
S: [100x2 double]
Ssc: [2x2 double]
Ysc: [2x1 double]
C: [100x100 double]
Ft: [100x6 double]
G: [6x6 double]
(I'm sorry I was wrong about the element type before.)
The problem is that when Matlab return the struture with element 'C'(a 100*100 double matrix), I get the messeage below in Python:
Segmentation fault (core dumped)
But when the Matlab return the structre without the element 'C', I get no error in Python.
What should I do?
Best regards, Jason

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更多回答（1 个）

Jason Shih
Jason Shih 2015-7-8
I have figured out what's wrong in that script. The element 'C' in the structure in a sparse matrix, which in not supported by the engine now.

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