[Numpy-discussion] Interface numpy arrays to Matlab?

[Chris Barker]

On Tue, Aug 29, 2017 at 4:08 AM, Neal Becker <ndbecker2 at gmail.com> wrote:

> Transplant sounds interesting, I think I could use this.  I don't
> understand though why nobody has used a more direct approach?  Matlab has
> their python API https://www.mathworks.com/help/matlab/matlab-engine-for-
> python.html.  This will pass Matlab arrays to/from python as some kind of
> opaque blob.  I would guess that inside every Matlab array is a numpy array
> crying to be freed - in both cases an array is a block of memory together
> with shape and stride information.  So I would hope a direct conversion
> could be done, at least via C API if not directly with python numpy API.
>

I agree -- it is absolutley bizare that they havn'etr built in a numpy
array <-> matlab array mapping!

MAybe they do'nt want Matlb usres to realize that nmpy provides most of
what MATLAB does (but better :-) ) -- and want people to use Python with
MATlab for other pytonic stuff that MATLAB doesn't do well....

but they do provide a mapping for array.array:

https://www.mathworks.com/help/matlab/matlab_external/use-python-array-array-types.html

which is a buffer you can wrap a numpy array around efficiently....

odd that you'd have to write that code.

-CHB



> But it seems nobody has done this, so maybe it's not that simple?
>
>
> On Mon, Aug 28, 2017 at 5:32 PM Gregory Lee <grlee77 at gmail.com> wrote:
>
>> I have not used Transplant, but it sounds fairly similar to
>> Python-matlab-bridge.  We currently optionally call Matlab via
>> Python-matlab-bridge in some of the the tests for the PyWavelets package.
>>
>> https://arokem.github.io/python-matlab-bridge/
>> https://github.com/arokem/python-matlab-bridge
>>
>> I would be interested in hearing about the benefits/drawbacks relative to
>> Transplant if there is anyone who has used both.
>>
>>
>> On Mon, Aug 28, 2017 at 4:29 PM, CJ Carey <perimosocordiae at gmail.com>
>> wrote:
>>
>>> Looks like Transplant can handle this use-case.
>>>
>>> Blog post: http://bastibe.de/2015-11-03-matlab-engine-performance.html
>>> GitHub link: https://github.com/bastibe/transplant
>>>
>>> I haven't given it a try myself, but it looks promising.
>>>
>>> On Mon, Aug 28, 2017 at 4:21 PM, Stephan Hoyer <shoyer at gmail.com> wrote:
>>>
>>>> If you can use Octave instead of Matlab, I've had a very good
>>>> experience with Oct2Py:
>>>> https://github.com/blink1073/oct2py
>>>>
>>>> On Mon, Aug 28, 2017 at 12:20 PM, Neal Becker <ndbecker2 at gmail.com>
>>>> wrote:
>>>>
>>>>> I've searched but haven't found any decent answer.  I need to call
>>>>> Matlab from python.  Matlab has a python module for this purpose, but it
>>>>> doesn't understand numpy AFAICT.  What solutions are there for efficiently
>>>>> interfacing numpy arrays to Matlab?
>>>>>
>>>>> Thanks,
>>>>> Neal
>>>>>
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