I'm trying to overload simple math operators to try a code for error
propagation, but I'm getting a warning. Here's a short code that already
shows the warning message:
type numerr
num
err
end
+(a::numerr, b::numerr) = numerr(a.num + b.num, sqrt(a.err^2 + b.err^2));
+(a::Any, b::numerr) = numerr(a + b.num, b.err);
+(a::numerr, b::Any) = numerr(a.num + b, a.err);
x = numerr(10, 1);
y = numerr(20, 2);
println(x+y)
println(2+x)
println(y+2)
I didn't see much about operator overloading in Julia's manual. I would
really appreciate if someone could point me in the right direction.
The code above returns this warning in Julia 0.4.2:
_ _ _(_)_ | A fresh approach to technical computing
(_) | (_) (_) | Documentation: http://docs.julialang.org
_ _ _| |_ __ _ | Type "?help" for help.
| | | | | | |/ _` | |
| | |_| | | | (_| | | Version 0.4.2 (2015-12-06 21:47 UTC)
_/ |\__'_|_|_|\__'_| | Official http://julialang.org release
|__/ | x86_64-linux-gnu
julia> include("overload.jl")
WARNING: module Main should explicitly import + from Base
numerr(30,2.23606797749979)
numerr(12,1)
numerr(22,2)
