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DS-1000 / 432 / I try to retrieve percentiles from an array with NoData values. In my case the…

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Problem:
I try to retrieve percentiles from an array with NoData values. In my case the Nodata values are represented by -3.40282347e+38. I thought a masked array would exclude this values (and other that is lower than 0)from further calculations. I succesfully create the masked array but for the np.percentile() function the mask has no effect.
>>> DataArray = np.array(data)
>>> DataArray
([[ value, value...]], dtype=float32)
>>> masked_data = ma.masked_where(DataArray < 0, DataArray)
>>> percentile = 5
>>> prob = np.percentile(masked_data, percentile)
>>> print(prob)
 -3.40282347e+38
A:
<code>
import numpy as np
DataArray = np.arange(-5.5, 10.5)
percentile = 50
</code>
prob = ... # put solution in this variable
BEGIN SOLUTION
<code>

library

Numpy

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Source and history

upstream_id / Original problem ID
432
task_id
6d06867f-70b9-5bab-a289-ef9f4d2b7683
task_key
default--test--432
task_revision_id
1
config / split
default / test

Official source

initial import