Momentum Papa Bear

//@version=5
indicator(title="Momentum Papa Bear", timeframe="D", timeframe_gaps=true)

periods = array.new_int(0)
// array.push(periods, input.int(7, minval=1, title="Length"))
array.push(periods, input.int(21, minval=1, title="Length"))
array.push(periods, input.int(63, minval=1, title="Length"))
array.push(periods, input.int(126, minval=1, title="Length"))

mom(stock) =>
    pos = str.pos(stock, ":")
    prefix= str.substring(stock, 0, pos)
    tkr= str.substring(stock, pos+1)
    adj_src = ticker.new(prefix, tkr, adjustment=adjustment.dividends)
    src = request.security(adj_src, "", close)
    sum = 0.0
    for i = 0 to array.size(periods) - 1
        p = array.get(periods, i)
        sum := sum + 100.0 * (src - src[p])/src[p]
    sum / array.size(periods)

plot(mom("BATS:SPY"), color=color.red, title="MOM SPY")
plot(mom("BATS:TLT"), color=color.red, title="MOM TLT")

plot(mom("BATS:PDBC"), color=color.aqua, title="MOM PDBC")
plot(mom("BATS:VNQ"), color=color.blue, title="MOM VNQ")
plot(mom("BATS:IAU"), color=color.fuchsia, title="MOM IAU")
plot(mom("BATS:VTV"), color=color.green, title="MOM VTV")
plot(mom("BATS:VIOV"), color=color.lime, title="MOM VIOV")
plot(mom("BATS:VUG"), color=color.maroon, title="MOM VUG")
plot(mom("BATS:VEA"), color=color.navy, title="MOM VEA")
plot(mom("BATS:BNDX"), color=color.orange, title="MOM BNDX")
plot(mom("BATS:VIOG"), color=color.purple, title="MOM VIOG")
plot(mom("BATS:VWO"), color=color.olive, title="MOM VWO")
plot(mom("BATS:EDV"), color=color.silver, title="MOM EDV")
plot(mom("BATS:VGIT"), color=color.teal, title="MOM VGIT")
plot(mom("BATS:VCLT"), color=color.yellow, title="MOM VCLT")

// plot(mom("BATS:VXUS"), color=color.yellow, title="MOM VXUS")

// alt vtv
plot(mom("BATS:SPYV"), color=color.green, title="MOM SPYV (alt VTV)")