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Less Than

Signals · Comparison

Less Than node on the canvas

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 Buy Signal. Backtest in the Tester.

Tips & gotchas

Inputs

Socket Type What to wire in
A series 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.
B series Right-hand series — the REFERENCE being crossed. In an MA crossover this is the SLOW line (e.g. EMA-50). In an RSI trigger this is the threshold (e.g. constant 30).

Outputs

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

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