I am trying to play around with some kind of market making HFT-style trading algo for futures.
And stuck on the problem, how to reset the look back period at the beginning of the trading session every day. I would be grateful for a code snippet.

is(NEWDAY) will tell you when you have a new day. Pause sending trading signals until enough bars have passed. Voila, you have enough lookback for the day.

Would that be a new trading day or new calendar day (i.e. if BR_FLAT is used)? thx

Unfortunately, I can't understand what do you mean?

What a simple DIY solution! I'm tearing my hair out - how I couldn't think of it myself! 🙂
My first assumption was I miss some kind of hidden Zorro feature in the docs.
Thank you for the hint!

But in my case NEWDAY in a strange way was firing on every bar.

I don’t know if this is a bug or a feature…
But Do the trick!

Not NEWDAY, is(NEWDAY).

Oh, thanks again!