ta.dev is expecting a bool input?

Question

Using Pine v6, I get an error on line 2 that I don't understand.

float bar_hh = ta.highest(2) float bar_h1 = ta.dev(bar_hh, 2) ? na : bar_hh

bar_hh is float.

Still, the error I get is complaining about some boolean that doesn't exist : "Cannot call "operator ?:" with argument "expr0"="call "ta.dev" (series float)". An argument of "series float" type was used but a "simple bool" is expected."

The Pine doc says that ta.dev expects a float as parameter.

Please, what am I doing wrong?

The error message is referring to the left side of the ? operator. It expects a Boolean, but the result of ta.dev is a series of floats. — kindall
– kindall, Commented Oct 3 at 19:00

Novelty Trade · Accepted Answer · 2025-11-19 10:27:16Z

ternary operator ? : expect a bool expression before "?"
ta.dev(bar_hh, 2) - returns float, not a bool
so make smth like that

float bar_h1 = ta.dev(bar_hh, 2) > 0 ? na : bar_hh

or

float bar_h1 = ta.dev(bar_hh, 2) != 0 ? na : bar_hh

or any bool expression you need

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