Get Relative strength indicator Code That Actually Works

//@version=5
indicator(title="Relative Strength Indicator", shorttitle="RSI Relative", overlay=false, timeframe="", timeframe_gaps=true)

// Input parameters
rsi_length = input.int(14, title="RSI Length", minval=1)
rs_length = input.int(20, title="Relative Strength MA Length", minval=1)
benchmark = input.symbol("SPY", title="Benchmark Symbol")
overbought = input.int(70, title="Overbought Level", minval=50, maxval=100)
oversold = input.int(30, title="Oversold Level", minval=0, maxval=50)
show_background = input.bool(true, title="Show Background Colors")

// Fetch benchmark data
bench_close = request.security(benchmark, timeframe.period, close)

// Calculate RSI for current symbol
src = close
change = ta.change(src)
gain = math.max(change, 0)
loss = math.max(-change, 0)
avg_gain = ta.rma(gain, rsi_length)
avg_loss = ta.rma(loss, rsi_length)
rs = avg_gain / avg_loss
rsi = 100 - (100 / (1 + rs))

// Calculate Relative Strength: current vs benchmark
rel_strength = src / bench_close
rs_ma = ta.sma(rel_strength, rs_length)

// Normalize RS to RSI scale for comparison
rs_normalized = 100 * (rs_ma - ta.lowest(rs_ma, 100)) / (ta.highest(rs_ma, 100) - ta.lowest(rs_ma, 100))

// Plots
plot(rsi, title="RSI", color=color.blue, linewidth=2)
plot(rs_normalized, title="Relative Strength", color=color.orange, linewidth=2)

// Overbought/Oversold lines
hline(overbought, "Overbought", color=color.red, linestyle=hline.style_dashed)
hline(oversold, "Oversold", color=color.green, linestyle=hline.style_dashed)
hline(50, "Midline", color=color.gray, linestyle=hline.style_dotted)

// Background colors
bgcolor(show_background and rsi > overbought ? color.new(color.red, 90) : na, title="OB BG")
bgcolor(show_background and rsi < oversold ? color.new(color.green, 90) : na, title="OS BG")

// Alerts
rsi_ob = ta.crossover(rsi, overbought)
rsi_os = ta.crossunder(rsi, oversold)
rs_ob = ta.crossover(rs_normalized, overbought)
rs_os = ta.crossunder(rs_normalized, oversold)

alertcondition(rsi_ob or rs_ob, title="Overbought Alert", message="Relative Strength Indicator: Overbought signal on {{ticker}} vs {{benchmark}}")
alertcondition(rsi_os or rs_os, title="Oversold Alert", message="Relative Strength Indicator: Oversold signal on {{ticker}} vs {{benchmark}}")

// Table for info
if barstate.islast
    var table info_table = table.new(position.top_right, 2, 4, bgcolor=color.white, border_width=1)
    table.cell(info_table, 0, 0, "RSI", text_color=color.black)
    table.cell(info_table, 1, 0, str.tostring(rsi, "#.##"), text_color=color.blue)
    table.cell(info_table, 0, 1, "Rel Str", text_color=color.black)
    table.cell(info_table, 1, 1, str.tostring(rs_normalized, "#.##"), text_color=color.orange)
    table.cell(info_table, 0, 2, "Benchmark", text_color=color.black)
    table.cell(info_table, 1, 2, benchmark, text_color=color.gray)