Ratio of indicators instead of stock prices

[vgt2101]

I would like to plot the ratio of the results of an indicator between two different stocks/ticker symbols. Meaning the ratio of SPY's RSI (21) / MSFT's RSI (21) as an example. In this example, SPY and MSFT are stocks/ticker symbols, RSI is an indicator, and (21) is the amount of days for the indicator.

 

[Joshua]

declare lower;
def MSFT = RSI(21,price = close("MSFT"));
def SPY = RSI(21,price = close("SPY"));
plot Ratio = SPY / MSFT;