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Message from discussion Best Practices for passing numpy data pointer to C ?
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mark florisson  
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 More options Jul 26 2012, 3:56 pm
From: mark florisson <markflorisso...@gmail.com>
Date: Thu, 26 Jul 2012 20:56:58 +0100
Local: Thurs, Jul 26 2012 3:56 pm
Subject: Re: [cython-users] Re: Best Practices for passing numpy data pointer to C ?
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On 26 July 2012 20:07, Chris Barker <chris.bar...@noaa.gov> wrote:

> On Thu, Jul 26, 2012 at 11:59 AM, Sturla Molden <sturlamol...@yahoo.no> wrote:
>> Den 26.07.2012 20:12, skrev Chris Barker:

>>> Which is why I suppose we really should have a canonical way to get
>>> that pointer -- thus arr.data, but it has its problems, as well.

>> That is what

>> <dtype_t*> np.PyArray_DATA(arr)

>> does.

> But does that give you the address of the zeroth element? or the
> address of the beginning of the data block? -- which I understand may
> not be the case, say for an array that is a slice of another array.

Those will always be the same. When you slice an array that changes
the starting element in some dimension, the data pointer is moved for
the new view.
> i.e should I update that Wiki page with

> <dtype_t*> np.PyArray_DATA(arr)

> instead of

> &arr[0]

> -Chris

> --

> Christopher Barker, Ph.D.
> Oceanographer

> Emergency Response Division
> NOAA/NOS/OR&R            (206) 526-6959   voice
> 7600 Sand Point Way NE   (206) 526-6329   fax
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> Chris.Bar...@noaa.gov


 
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