title: how to set a NumPy MaskedArray's mask to False?
body: <p>If I have a MaskedArray with a mask that has all False values in the mask, I want to collapse it into a single boolean False value.  For example:</p>
  <pre><code>    &gt;&gt;&gt; import numpy.ma as npma
      &gt;&gt;&gt; ma = npma.MaskedArray([1,2,3], mask=[False, False, False])
      &gt;&gt;&gt; ma
      masked_array(data=[1, 2, 3],
           mask=[False, False, False],
     fill_value=999999)
     &gt;&gt;&gt; ma.mask = npma.nomask
     &gt;&gt;&gt; ma
     masked_array(data=[1, 2, 3],
           mask=[False, False, False],
     fill_value=999999)
     &gt;&gt;&gt; mas.mask = False
     &gt;&gt;&gt; ma
     masked_array(data=[1, 2, 3],
           mask=[False, False, False],
     fill_value=999999)
  </code></pre>
  <p>No matter what I've tried, I can't get an already-created MaskedArray to go back to having just a single False value instead of an array of False values.  The only work around I've found is to create a new MaskedArray from the existing MaskedArray's data property, and leave out the mask argument.  Note how mask is now just False, which is what I want.</p>
  <pre><code>   &gt;&gt;&gt; ma = npma.MaskedArray(ma.data)
     &gt;&gt;&gt; ma
     masked_array(data=[1, 2, 3],
           mask=False,
     fill_value=999999)
  </code></pre>
  <p>Is there a way to set the mask property to False?</p>