Thanks! But why do I need to import Base.+?
Em sexta-feira, 1 de abril de 2016 12:02:13 UTC-3, Giuseppe Ragusa escreveu: > > ``` > import Base.+ > 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) > ``` > > > > On Friday, April 1, 2016 at 4:51:53 PM UTC+2, Gerson J. Ferreira wrote: >> >> 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) >> >> >>
