def test_nanrankdata():
Xorig = RandomState(0).randn(3, 2)
Xorig[0, 0] = nan
R = array([[nan, 2.0], [1.0, 3.0], [2.0, 1.0]])
Rt = array([[nan, 1.0], [1.0, 2.0], [2.0, 1.0]])
X = Xorig.copy()
assert_allclose(nanrankdata(X), R)
assert_allclose(X, Xorig)
X = Xorig.copy()
assert_allclose(nanrankdata(X, inplace=True), R)
assert_allclose(X, R)
X = Xorig.copy()
assert_allclose(nanrankdata(X, axis=0), Rt)
assert_allclose(X, Xorig)
X = Xorig.copy()
assert_allclose(nanrankdata(X, axis=0, inplace=True), Rt)
assert_allclose(X, Rt)
