[Numpy-discussion] How to remove fortran-like loops with numpy?

David Goldsmith d_l_goldsmith@yahoo....
Mon Jun 8 17:40:25 CDT 2009


Thanks, Robert!

DG

--- On Mon, 6/8/09, Robert Kern <robert.kern@gmail.com> wrote:

> I haven't been able to figure out (though I haven't yet
> really buckled down and tried real hard) how to broadcast a
> conditionally-terminated iteration where the number of
> iterations will vary among the array elements.  Hopefully
> someone else already has. :-)
> 
> You can't, really. What you can do is just keep iterating
> with the
> whole data set and ignore the parts that have already
> converged. Here
> is an example:
> 
> z = np.zeros((201,201), dtype=complex)
> Y, X = np.mgrid[1:-1:-201j, -1.5:0.5:201j]
> c = np.empty_like(z)
> c.real = X
> c.imag = Y
> N = np.zeros(z.shape, dtype=int)
> 
> while ((N<30) | (abs(z)<2)).all():
>     N += abs(z) < 2
>     z = z ** 2 + c
> 
> N[N>=30] = 0
> 
> -- 
> Robert Kern
> 
> "I have come to believe that the whole world is an enigma,
> a harmless
> enigma that is made terrible by our own mad attempt to
> interpret it as
> though it had an underlying truth."
>   -- Umberto Eco
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> 


      


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