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no data exclution and unique combination.

MRAB python at mrabarnett.plus.com
Tue Jul 24 14:51:34 EDT 2012 
On 24/07/2012 19:27, giuseppe.amatulli at gmail.com wrote:
> Hi,
> would like to take eliminate a specific number in an array and its correspondent in an other array, and vice-versa.
>
> given
>
> a=np.array([1,2,4,4,5,4,1,4,1,1,2,4])
> b=np.array([1,2,3,5,4,4,1,3,2,1,3,4])
>
> no_data_a=1
> no_data_b=2
>
> a_clean=array([4,4,5,4,4,4])
> b_clean=array([3,5,4,4,3,4])
>
> after i need to calculate unique combination in pairs to count the observations
> and obtain
> (4,3,2)
> (4,5,1)
> (5,4,1)
> (4,4,2)
>
> For the fist task i did
>
> a_No_data_a = a[a != no_data_a]
> b_No_data_a = b[a != no_data_a]
>
> b_clean = b_No_data_a[b_No_data_a != no_data_b]
> a_clean  = a_No_data_a[a_No_data_a != no_data_b]
>
> but the results are not really stable.
>
mask = (a != no_data_a) & (b != no_data_b)
a_clean = a[mask]
b_clean = b[mask]

> For the second task
> The np.unique would solve the problem if it can be apply to a two arrays.
>
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