I am wandering what shape would be like in C
would it be
{4;2;3} or
{3;2;4}
?
so
shape[0] == 4
or
shape[0] == 3
-----Original Message-----
From: [EMAIL PROTECTED] on behalf of Charles R Harris
Sent: Tue 5/20/2008 10:56 AM
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] dimension aligment
On Tue, May 20, 2008 at 11:47 AM, Thomas Hrabe <[EMAIL PROTECTED]> wrote:
>
> Hi all,
>
> just a simple question regarding the alignment of dimensions:
>
>
> given a 3d array
> a =
> numpy.array([[[1,2,3],[4,5,6]],[[7,8,9],[10,11,12]],[[13,14,15],[16,17,18]],[[19,20,21],[22,23,24]]])
> a.shape
> returns (4,2,3)
>
> so I assume the first digit is the 3rd dimension, second is 2nd dim and
> third is the first.
>
Only if you count from the right. I would call the first digit the first
dimension.
>
> how is the data aligned in memory now?
> according to the strides it should be
> 1,2,3,4,5,6,7,8,9,10,...
> right?
>
Like a C array, contiguous and the rightmost dimension varies fastest.
>
> if I had an array of more dimensions, the first digit returned by shape
> should always be the highest dim.
>
Yes. Athough first is less ambiguous than highest
Chuck
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