Use unitful unit to a variable

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I don´t know if Unitful has a specific function for that. But you cannot “attach” the units to such array, because the array is of immutable values, and the unitful values are a different type of animal.

Thus, you can do, for example:

julia> x = [1,2,3,4,5];

julia> x .* 1u"km"
5-element Vector{Quantity{Int64, 𝐋, Unitful.FreeUnits{(km,), 𝐋, nothing}}}:
 1 km
 2 km
 3 km
 4 km
 5 km

I’m not sure if there is a convert(...) type of function in Unitful for doing that with another syntax. But anyway you need to define a new variable.

(I think that if the purpose is to propagate units that are attached to some input variable, the most useful pattern is something like:

julia> a = 1u"km"
1 km

julia> x = [1,2];

julia> y = x .* oneunit(a)
2-element Vector{Quantity{Int64, 𝐋, Unitful.FreeUnits{(km,), 𝐋, nothing}}}:
 1 km
 2 km
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