Converting matlab.double to python compatible format

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Lyle Collins
Lyle Collins 2023-5-4
评论： Lyle Collins 2023-5-8
The documentation on this page states that data of type:
MATLAB Input Argument Type —
1-by-N Vector
double (real)
Gets converted to:
Resulting Python Type
array.array('d')
Consequently, I thought this python code would work:
import matlab.engine
import array
me = matlab.engine.start_matlab()
array.array('d', me.rand(1, 2))
However, this returns:
TypeError: must be real number, not matlab.double
What is the most pythonic way to convert a standard matlab double array into a python fundamental data type? (e.g. list or array.array)

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回答（1 个）

Selena Mastrodonato
Ran in:
This syntax py.array.array('d', rand(1,2)) should work.
py.array.array('d', rand(1,2))
ans =
Python array: 0.6970 0.3219 Use details function to view the properties of the Python object. Use double function to convert to a MATLAB array.
Or if you want a Python list: py.list(rand(1,2))
py.list(rand(1,2))
ans =
Python list with values: [0.3941618631519793, 0.8464541453090321] Use string, double or cell function to convert to a MATLAB array.
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Selena Mastrodonato
Selena Mastrodonato 2023-5-5
Hi Lyle, thank you for providing more informations.
You could try this command: me.rand(1, 2)[0].toarray(), you'll obtain array('d', [0.8147236863931789, 0.9057919370756192]).
Instead, if you want a python list you could use numpy, so try this: numpy.array(me.rand(1, 2)[0].toarray()) and you'll obtain [0.81472369 0.90579194].
If you have a multidimensional matrix, try to iterate over it to format data as you wish.

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