na

Tests whether a value is absent. It takes any type and gives back a bool. This is the test a script needs often, because so much reads na when there is nothing behind it: an instrument property that is unknown, an orderflow figure on a bar with no footprint data, a colour function handed an na.

na(series <any_type> value) → series bool

Returns series bool — A series bool: true when the value is absent.

indicator("Bars with no footprint data")
plotshape(na(orderflow.delta), title = "No footprint data")

See also values and types

Part of the function index.