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From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: no data exclution and unique combination.
Date: Thu, 09 Aug 2012 17:33:58 -0400
References: <864b0104-daa8-4ea5-8003-6cfaab19fdea@googlegroups.com> <bccc20ed-7570-4e15-980c-008987ce0361@googlegroups.com>
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On 8/9/2012 4:06 PM, giuseppe.amatulli@gmail.com wrote:
> Terry and MRAB,
> thanks for yours suggestions,
> in the end i found this solution
>
>
> mask=( a != 0 ) & ( b != 0  )
>
> a_mask=a[mask]
> b_mask=b[mask]
>
> array2D = np.array(zip(a_mask,b_mask))
>
> unique=dict()
> for row in  array2D :
>      row = tuple(row)
>      if row in unique:
>          unique[row] += 1
>      else:
>          unique[row] = 1

I believe the 4 lines above are equivalent to
    unique[row] = unique.get(row, 0) + 1

-- 
Terry Jan Reedy