[Numpy-discussion] .flat

[Sebastian Berg]

On Tue, 2013-07-23 at 10:22 -0600, Charles R Harris wrote:
> 
> 
> On Tue, Jul 23, 2013 at 8:46 AM, Pauli Virtanen <pav at iki.fi> wrote:
>         23.07.2013 17:34, Benjamin Root kirjoitti:
>         [clip]
>         > Don't assume .flat is not commonly used.  A common idiom in
>         matlab is
>         > "a[:]" to flatten an array. When porting code over from
>         matlab, it is
>         > typical to replace that with either "a.flat" or
>         "a.flatten()", depending
>         > on whether an iterator or an array is needed.
>         
>         It is much more rarely used than `ravel()` and `flatten()`, as
>         can be
>         verified by grepping e.g. the matplotlib source code.
> 
> Grepping in my code, I find a lot of things like
> 
> dfx = van.dot((ax2 - ax1).flat)
> 
> IIRC, the flat version was faster than other methods.
> 
Faster then flatten certainly (since flatten forces a copy), I would be
quite surprised if it is faster then ravel, and since dot can't make use
of the iterator, that seems more natural to me.

- Sebastian


> Chuck 
> 
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