Le vendredi 05 septembre 2014 à 03:29 -0700, Földes László a écrit :
> This works fine:
>
>
> julia> x = 1:5
> 1:5
>
> julia> y = [z^2 for z in x]
> 5-element Array{Any,1}:
> 1
> 4
> 9
> 16
> 25
>
>
>
> and I can use similar solution with a simplified form:
>
>
> julia> y = [x*2]
> 5-element Array{Int64,1}:
> 2
> 4
> 6
> 8
> 10
>
>
>
> so I got brave and tried this, but it failed:
>
>
> julia> x = 1:5
> 1:5
>
> julia> y = [x^2]
> ERROR: `*` has no method matching
> *(::UnitRange{Int64}, ::UnitRange{Int64})
> in power_by_squaring at intfuncs.jl:56
> in ^ at intfuncs.jl:86
>
>
>
> or:
>
>
> julia> y = [x*x]
> ERROR: `*` has no method matching
> *(::StepRange{Int64,Int64}, ::StepRange{Int64,Int64})
Actually it's even simpler than that:
julia> x = 1:5
1:5
julia> x*x
ERROR: `*` has no method matching *(::UnitRange{Int64}, ::UnitRange{Int64})
You want to use .* instead of *, and .^ instead of ^:
julia> x .* x
5-element Array{Int64,1}:
1
4
9
16
25
julia> x.^2
5-element Array{Int64,1}:
1
4
9
16
25
Regards
