Julia: Functions to check for special values

Julia provides following function to check for special values Inf, -Inf, Nan etc.,

Function	Description
isequal(x, y)	Return true, if both x and y are equal. isequal(0.0, -0.0) return false. isequal(NaN, NaN) return true.
isfinite(x)	Return true, if the number is finite, else false.
isinf(x)	Return true, if the number is infinite, else false.
isnan(x)	Return true, if x is not a number, else false.

isequal(x,y) example

julia> isequal(10,10)
true

julia> isequal(NaN, NaN)
true

julia> isequal(0.0,-0.0)
false

julia> 0.0==-0.0
true

julia> isequal(Inf, Inf)
true

julia> isequal(Inf, -Inf)
false

julia> isequal(Inf, Inf16)
true

Other examples

julia> isfinite(10)
true

julia> isfinite(10/0)
false

julia> isinf(10/0)
true

julia> isinf(10)
false

julia> isnan(10)
false

julia> isnan(Inf/Inf)
true

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