Difficulties of implementing function in Julia involving if, else and matrices

Question

I am trying to implement this function in Julia and I am not getting it. I think it's because of broadcasting, it doesn't seem to work with arrays. When I write the relational operators with dot (like .> instead of >), the number of errors decreases, but it accuses "TypeError: non-boolean (BitVector) used in boolean context". How can I fix this?

function Rulkov(N, X, Y, α)
    global σ, μ
    for n=1:1:N
    if (X[n, 1]<=0)
        X[n, 2]  = α[n] / (1 - X[n, 1])  + Y[n, 1]

    elseif (X[n, 1]>0 && X[n, 1]<(α .+ Y[n, 1]))
        X[n, 2]  = α[n] + Y[n, 1]
    else
        X[n, 2]  = -1
    end
    
    Y[n, 2]  = Y[n, 1]  - μ*(X[n, 1] .+ 1) .+ μ*σ

    end
    return sum(X[:, 2])/N
end

Answer 1

Assuming that X and Y are matrices, X[n, 1] is a scalar and α .+ Y[n, 1] is a Vector, so there is no meaningful comparison between these objects. So, depending on what you want you can either use

all(X[n, 1] .< (α .+ Y[n, 1])))

or (probably more correct from the mathematical point of view)

X[n, 1] < minimum(α .+ Y[n, 1])

or non-allocating version of the previous calculation

X[n, 1] < minimum(x -> x + Y[n, 1], α)

or (as it was proposed in comments)

X[n, 1] < minimum(α) + Y[n, 1]