Broadcast over matrix dimension for multiple arguments

General Usage
2 
julia> function foo(a, b, c)
           return (sum(a) + sum(b)) / c
       end

julia> foo.(eachrow(a),eachrow(b),c)
2-element Vector{Float64}:
 10.0
 26.0

btw, you probably should drop any and all type annotation, the c::Float64 is clearly too restrictive, and the minimal fix you need is Vector → AbstractVector

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