julia - 如何检查两个数组是否相等(即使它们在Julia中包含NaN值)？

Question

我正在尝试比较两个数组。碰巧的是，数组的数据包含NaN值，并且当您将数组与NaN值进行比较时，结果不是我所期望的。

julia> a = [1,2, NaN]
3-element Array{Float64,1}:
   1.0
   2.0
 NaN  

julia> b = [1,2, NaN]
3-element Array{Float64,1}:
   1.0
   2.0
 NaN  

julia> a == b
false

有没有一种优雅的方法可以在比较期间忽略这些 Nan或有效地替换它们？

Answer 1

使用 isequal :

Similar to ==, except for the treatment of floating point numbers and of missing values. isequal treats all floating-point NaN values as equal to each other, treats -0.0 as unequal to 0.0, and missing as equal to missing. Always returns a Bool value.

julia> a = [1,2, NaN]
3-element Array{Float64,1}:
   1.0
   2.0
 NaN  

julia> b = [1,2, NaN]
3-element Array{Float64,1}:
   1.0
   2.0
 NaN  

julia> isequal(a, b)
true