Less Than¶

Signals · Comparison

True where a < b.

Less Than is the comparison gate's other half: it outputs true on every bar where series A is below series B. It's how you express conditions like "RSI below 30", "price under the VWAP", or "volatility below its average" as a yes/no state you can filter and combine with.

How it works¶

Each bar the block evaluates A < B and outputs the boolean. It's a state, not an event — true for the whole period A stays under B (contrast Crosses Below, which fires only on the crossing bar). A is the tested value; B is the reference — a Constant for a fixed threshold, or another series for a relative test.

When to use it¶

Use Less Than to gate or filter on a below-threshold condition, usually inside an And chain: "RSI < 30 AND price in a demand zone." It's the state form, so it's best for permitting trades while a condition holds. For just the bar a condition first turns true, wrap it in an Edge Trigger; for the crossing event itself, use Crosses Below.

Example¶

An oversold filter: feed RSI into A and a Constant of 30 into B; the true state means "oversold." Combine with a bullish structure condition through an And gate, then take just the entry bar with an Edge Trigger into a Tester. Backtest in the Tester.

Tips & gotchas¶

State, not event — true the whole time A < B; use Crosses Below for the crossing, Edge Trigger for the first bar.
Use a Constant for fixed thresholds.
Ideal for gating in an And/Or chain.
Mirror is Greater Than.

Inputs¶

Socket	Type	What to wire in
A	`series` / `bars`	Left-hand series — the one DOING the crossing. In an MA crossover this is the FAST line (e.g. EMA-20). In an RSI trigger this is the RSI line itself. BARS uses close.
B (optional)	`series` / `bars`	Right-hand series — the REFERENCE being crossed. In an MA crossover this is the SLOW line (e.g. EMA-50). BARS uses close. Leave it unwired to compare against the fixed value below.

Outputs¶

Output	Type	Plots as	Description
Cond	`signal`	Signal arrows	Boolean result of the comparison

Parameters¶

Parameter	Type	Default	What it does
B	number · -1000000.0–1000000.0	`0.0`	Compared against when the B socket is unwired (e.g. 30 for an RSI trigger).

Reference auto-generated from the block catalog · category Signals.