Just a suggestion (I am very new to Numpy), but wouldn't
draw.line(tuple(points.tolist()))
accomplish what you want.
Based on my reading, the ndarray.tolist method would return a Python list of
elements; then Python's built-in tuple function would complete the conversion.
Regards,
Mark
On Apr 5, 2011, at 12:02 PM, Christopher Barker wrote:
> HI folks,
>
> What's the fastest way to convert a numpy array to tuples?
>
> Unfortunately, not all packages take arbitrary sequences when they are
> expecting a list of tuples. In this case, I'm using PIL's ImageDraw, and
> want to do:
>
> draw.line(points)
>
> (points is an Nx2 numpy array of ints)
>
> but if I pass in an array, I get, oddly enough, nothing. NO error, just
> nothing drawn.
>
> if I do:
>
> draw.line(points.tolist())
>
> SystemError: new style getargs format but argument is not a tuple
>
> So I seem to need tuples. This works:
>
> draw.line([tuple(p) for p in points.tolist()])
>
> but that seems like it would be slower than it should be (to be honest,
> not profiled).
>
> Is there a faster way?
>
> Maybe numpy should have a ndarray.totuple() method.
>
> -Chris
>
>
>
>
>
>
> --
> Christopher Barker, Ph.D.
> Oceanographer
>
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