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Lemonergy · Studio block

Detect fall negative

Reports a sampled crossing from zero or positive into negative values.

Implementation ID
native-fall-negative
Reviewed
2026-10-27

Behavior

y[k] = (previous ≥ 0 AND current < 0). The worked example connects this operation to signals in Lemonergy Studio.

Interface

Detect fall negative interfaceInputs or arguments on the left, observed outputs on the right. Conserving terminals appear below the component. The tables give units and behavior.Detect fall negativeStudio blockin0out0
Original Lemonergy interface view. Lines identify ports; they are not a completed simulation circuit.
Ports and observed outputs
NameDirectionUnitMeaning
in0input1Value; real scalar.
out0output1Detected; bool scalar.

Parameters

Defaults are initial model values. Select values for your own model and operating conditions.

Configuration fields
ParameterUnitDefaultMeaning and limits
Sample period
sampleTimeS		s0.1Exact sample grid period. Elapsed-time integration begins after initialization.
Minimum 1e-06
Previous input at initialization
tables[0]		1[0]Configured coefficients or initial values in column-major order.

Equations and rules

  • y[k] = (previous ≥ 0 AND current < 0)

Worked example

Detect fall negative — worked example

Value = -1. Detected at 0 s = 1.

Open Studio example after release →
Numerical checks for the bundled synthetic example
OutputTime (s)Expected valueUnitAbsolute tolerance
Detected
out0		0111e-08

Explore the recorded outputs

Detect fall negative recorded example

Detect fall negative
Detect fall negative against timeRecorded synthetic simulation values. Time in seconds; output in —.-0.0800.210.250.50.50.790.751.081—Time (s)
Detect fall negative: 1 — at 0 s

11 actual recorded samples. Lines are visual guides between samples. Synthetic example, not measured cell data.

Download the recorded samples (JSON) · Open this Studio example after release

Use in a workflow

Detect fall negative — worked example

Reports a sampled crossing from zero or positive into negative values.

  1. Detect fall negative: y[k] = (previous ≥ 0 AND current < 0). The worked example connects this operation to signals in Lemonergy Studio.
    • Use the block reference for settings and connections.
    • Implementation tested locally; public release pending.
Open Studio example after release

Connected concepts

Limits and interpretation

  • Shapes and element types are explicit. Values must be finite; automatic reshaping and unit conversion are not performed.

Reference basis

This software operation and its numerical conventions are defined by the public contract and worked example; no external research result is claimed.

Implementation sources

This reference follows the public interface and locally verified numerical checks for an upcoming release.

Contract: Lemonergy Studio public contract · Verification record: verification-2026-10-27

  • docs/glossary/native-block-verification.json

This implementation and its workflow uses (JSON) · Knowledge graph (JSON-LD)