How To Calculate Simple Moving Average (SMA) in Lua?

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function calculateSMA(data, period)
    local sma = {}
    
    for i = 1, #data do
        if i < period then
            sma[i] = nil
        else
            local sum = 0
            for j = i - period + 1, i do
                sum = sum + data[j]
            end
            sma[i] = sum / period
        end
    end
    
    return sma
end

-- Example usage
local data = {10, 15, 20, 25, 30, 35, 40}
local period = 3
local sma = calculateSMA(data, period)

for i = 1, #sma do
    print("SMA["..i.."]: "..sma[i])
end