[julia-users] how to test NaN in an array?

[Evan Pu]

1 in [1,2,3] # returns true

NaN in [NaN, 1.0, 2.0] # returns false

how do I test if a float64 NaN is present in an array? I'm doing some 
numerical computation and it can have some NaN error, I want to drop the 
arrays that has NaN.