Hi All, I'm looking at ticket #1025<http://projects.scipy.org/numpy/ticket/1035#comment:4>with an eye to bringing it to completion but there some issues that need discussion. Currently there are three ways in which nans can be compared: maximum/minimum, fmax/fmin, or the new sort order. The maximum/minimum ufuncs propagate nans, i.e., they will always return a nan if one is present. The fmax/fmin ufuncs don't propagate nans, they ignore nans when possible. The new sort order sorts nans to the end, i.e., nans are treated as larger than any non-nan number; at present there are no ufuncs that correspond to the sort order. The issues I think need resolving are: 1) Should there be ufuncs corresponding to the sort order? 2) What should a.max(), a.argmax(), a.min(), and a.argmin() do? I note that a.argmax() is not consistent with a.max() at the moment: In [9]: a Out[9]: array([ 0., 1., 2., 3., NaN, 5., 6., 7., NaN, NaN]) In [10]: a.argmax() Out[10]: 7 In [11]: a.max() Out[11]: nan Thoughts? Chuck