Constant

[[constant]] defines a named numeric value used as a reusable threshold or constant in your rules. Its value changes during grid search without creating a time series or depending on a symbol or timeframe.

Block declaration#

A strategy can contain multiple [[constant]] blocks. Each block specifies an identifier and a value interval. One backtest is run for each value in the interval.

Integer example#

[[constant]]
id    = "overbought"
start = 70
stop  = 76
step  = 2

Decimal example#

[[constant]]
id    = "take_profit_pct"
start = 0.5
stop  = 1.0
step  = 0.1

Using constants in rules#

Reference a constant by its id, like a variable:

[[position]]
id         = "k_above_oversold"
position   = "above"
reference  = "stoch_k"
comparison = "oversold"    # uses the "oversold" constant

[[condition]]
id        = "buy_condition"
condition = "rsi > overbought and k < oversold"

You can also constrain the search space globally to discard incoherent combinations (see the “Hyperparameter Combinations” page):

[constraints]
condition = "oversold < overbought"

Block parameters#

Exposed variables#

The Constant block exposes a scalar variable accessible via its id:

Notes#

• ids must be unique within the strategy.
• A [[constant]] does not feed indicator internal parameters (e.g., length, offset). Indicator parameter ranges are defined directly in the corresponding indicator block.