Converting python code into julia code

General Usage
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I would focus on the desired output and try to achieve that as straightforwardly as possible, rather than trying to port some other implementation designed for a system with other performance characteristics. In this case it’s all a matter of filling an array with entries from a vector, so just do a double loop.

function buffer(X, n, p)
    0 <= p < n || error("You must have 0 <= p < n.")
    m = cld(length(X), n - p)
    out = zeros(eltype(X), n, m)
    for j = 1:m
        for i = 1:n
            k = (j - 1) * (n - p) + i - p
            if k in eachindex(X)
                out[i, j] = X[k]
            end
        end
    end
    return out
end
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