How to get the data of the first chart bar?

 
Hello,
I wanted to custom a indicator, but it must to get the first bar's data.
But I don't know how to get the data, can you help me?

thx

best regards!
 
Should be as simple as using Bars-1 as the shift...

-CS

Hello,
I wanted to custom a indicator, but it must to get the first bar's data.
But I don't know how to get the data, can you help me?

thx

best regards!
Reason: