Hi, I mistakenly filed ticket 1973 "Can not display a masked array containing np.NA values even if masked" (http://projects.scipy.org/numpy/ticket/1973) against masked array because that was where I found it. But the actual error is that the astype function does not handle the NA object: $ python Python 2.7 (r27:82500, Sep 16 2010, 18:02:00) [GCC 4.5.1 20100907 (Red Hat 4.5.1-3)] on linux2 Type "help", "copyright", "credits" or "license" for more information.

...

...

import numpy as np np.__version__ '2.0.0.dev-059334c' np.array([1,2,3,4]).astype(float) array([ 1., 2., 3., 4.]) np.array([1,2,3,np.NA]).astype(float) Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: Cannot assign NA to an array which does not support NAs a=np.array([1,2,3,4], maskna=True) a[3]=np.NA a array([1, 2, 3, NA]) a.astype(float) Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: Cannot assign NA to an array which does not support NAs a*1.0 array([ 1., 2., 3., NA])

Bruce