[Numpy-discussion] np.ma.masked_invalid and precision

bevan jenkins bevan07@gmail....
Sun Oct 31 15:28:42 CDT 2010


Hello,

I am not sure if the following is a bug or not.  I recently tried to set the
print precision in numpy but it didn't seem to make a difference.  It seems
that the use of np.ma.masked_invalid results in arrays printing precision of
12 regardless of the default setting or any subsequent setting.  Generating
masked arrays does not seem to have this behaviour.  Is this a bug or am I
doing it wrong?
Thanks,
Bevan

In [1]: eg = np.random.random(1)
In [2]: eg_mask = np.ma.masked_array(eg)
In [3]: eg_mask_invalid = np.ma.masked_invalid(eg)
In [4]: eg
Out[4]: array([ 0.78592569])
In [5]: eg_mask
Out[5]:
masked_array(data = [ 0.78592569],
            mask = False,
      fill_value = 1e+20)

In [6]: eg_mask_invalid
Out[6]:
masked_array(data = [0.785925693305],
            mask = [False],
      fill_value = 1e+20)

In [7]: np.set_printoptions(precision=3)

In [8]: eg
Out[8]: array([ 0.786])
In [9]: eg_mask
Out[9]:
masked_array(data = [ 0.786],
            mask = False,
      fill_value = 1e+20)
In [10]: eg_mask_invalid
Out[10]:
masked_array(data = [0.785925693305],
            mask = [False],
      fill_value = 1e+20)
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