[Numpy-discussion] masked_equal not commutative?
Charles Doutriaux
doutriaux1 at llnl.gov
Tue Aug 12 14:14:09 EDT 2008
Hi I'm using 1.1.1
and found that numpy.ma.masked_equal is not commutative!
I would expect it to be in this case. Or raise an error for uncompatible
shape in the first case, no ?
>>> a = numpy.ma.arange(100)
>>> a.shape=(10,10)
>>> b=numpy.ma.masked_equal(1,a)
>>> b
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/lgm/cdat/latest/lib/python2.5/site-packages/numpy/ma/core.py",
line 1691, in __repr__
'data': str(self),
File "/lgm/cdat/latest/lib/python2.5/site-packages/numpy/ma/core.py",
line 1665, in __str__
res[m] = f
IndexError: 0-d arrays can't be indexed.
>>> b=numpy.ma.masked_equal(a,1)
>>> b
masked_array(data =
[[0 -- 2 3 4 5 6 7 8 9]
[10 11 12 13 14 15 16 17 18 19]
[20 21 22 23 24 25 26 27 28 29]
[30 31 32 33 34 35 36 37 38 39]
[40 41 42 43 44 45 46 47 48 49]
[50 51 52 53 54 55 56 57 58 59]
[60 61 62 63 64 65 66 67 68 69]
[70 71 72 73 74 75 76 77 78 79]
[80 81 82 83 84 85 86 87 88 89]
[90 91 92 93 94 95 96 97 98 99]],
mask =
[[False True False False False False False False False False]
[False False False False False False False False False False]
[False False False False False False False False False False]
[False False False False False False False False False False]
[False False False False False False False False False False]
[False False False False False False False False False False]
[False False False False False False False False False False]
[False False False False False False False False False False]
[False False False False False False False False False False]
[False False False False False False False False False False]],
fill_value=999999)
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