Question about comparing two symbols

[[Deleted]]

I am trying to write a script that compares the rsi of the eur/usd to the aud/jpy. Here is what I have so far:

iRSI(NULL,PERIOD_M15,14,PRICE_CLOSE,0);

I am not sure what goes in for NULL. I couldnt find if it is possible to do a comparison like this in the reference. Any ideas would be great.

Thanks

[qjol]

i'm strongly recommend u to read the book

iRSI("EURUSD", .....

iRSI("AUDJPY", .....