title: How to call indicators into my strategy (Pine-Script) (Tradingview)
body: <p>I wanted to use the Relative Vigor Index as part of my trading strategy, but I can't seem to be able to call/referrence it, even though it's a built-in tradingview indicator. I've tried using its full name (<code>RelativevigorIndex</code>)
  and I've tried shortening it to <code>RVI</code>, as well as <code>RVGI</code>.</p>
  <p>Please help</p>