[julia-users] unexpected domain error for ^(float,float)

[Florian Oswald]

# define a variable gamma:

gamma = 1.4
mgamma = 1.0-gamma

julia> mgamma 
-0.3999999999999999

# this works:

julia> -0.399999999999^2.5 
-0.10119288512475567

# this doesn't:

julia> mgamma^2.5 
ERROR: DomainError 
in ^ at math.jl:252