Passing numpy arrays to matlab

David Cournapeau david at ar.media.kyoto-u.ac.jp
Mon Nov 6 22:59:43 CST 2006


Andrew Straw wrote:
> David Cournapeau wrote:
>   
>>     - To send data from the calling process to matlab, you first have to 
>> create a mxArray, which is the basic matlab handler of a matlab array, 
>> and populating it. Using mxArray is very ackward : you cannot create 
>> mxArray from existing data, you have to copy data to them, etc... 
>>     
> My understanding, never having done it, but from reading the docs, is
> that you can create a "hybrid array" where you manage the memory. Thus,
> you can create an mxArray from existing data. However, the docs
> basically say that this is too hard for most mortals (and they may well
> be right -- too painful for me, anyway)!
>   
Would you mind telling me where you found that information ? Because 
right now, I am wasting a lot of cycles because of memory copy in both 
directions, and it is sometimes slow enough so that it is annoying,

cheers,

David

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