So, I am kind of confused here. In my code, a maxV = maximum(V) is labeled as Core.Box in @code_warntype, but if I remove a line after the line where maxV is calculated, it is correctly labelled as eltype(V). Can anyone explain what happens/what I am doing wrong here? This is not the whole function, I've tried to remove all irrelevant code. V = [0.,] P = Vector{Float64}[[0.0,], [0.0,]] U = Vector{Float64}[[1.,], [1.,]] F = Matrix{Float64}[eye(1), eye(1)] b = 0.9
function c!{T}(P, U, b::T, F, V) if length(P) > 2 maxV = maximum(V) d = sum(exp(U[ia]+b*F[ia]*V-maxV) for ia = 1:length(P))::T end P end # This shows maxV as Core.Box @code_warntype c!(P, U, β, F, V) function c!{T}(P, U, b::T, F, V) if length(P) > 2 maxV = maximum(V) end P end # This does not show maxV as Core.Box, but as eltype(V) as I expected @code_warntype c!(P, U, β, F, V) Thanks