Error bars and array type recipes

using Plots
gr()

struct Measurement <: Number
    val::Float64
    err::Float64
end
value(m::Measurement) = begin
        m.val
    end
uncertainty(m::Measurement) = begin
        m.err
    end
@recipe function f(::Type{T}, m::T) where T <: AbstractArray{<:Measurement}
        if !(get(plotattributes, :seriestype, :path) in (:contour, :contourf, :contour3d, :heatmap, :surface, :wireframe, :image))
            error_sym = Symbol(plotattributes[:letter], :error)
            plotattributes[error_sym] = uncertainty.(m)
        end
        value.(m)
    end
x = Measurement.(10 * sort(rand(10)), rand(10))
y = Measurement.(10 * sort(rand(10)), rand(10))
z = Measurement.(10 * sort(rand(10)), rand(10))
surf = Measurement.((1:10) .* (1:10)', rand(10, 10))
plot(scatter(x, [x y]), scatter(x, y, z), heatmap(x, y, surf), wireframe(x, y, surf), legend = :topleft)

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