lemonergy· battery engineering courses

Lemonergy · Studio block

Prelookup

Locates a breakpoint interval and computes the input’s fraction within it.

Implementation ID
native-prelookup
Reviewed
2026-10-27

Behavior

f = (u − breakpoint[k])/(breakpoint[k + 1] − breakpoint[k]). The worked example connects this operation to signals in Lemonergy Studio.

Interface

Prelookup interfaceInputs or arguments on the left, observed outputs on the right. Conserving terminals appear below the component. The tables give units and behavior.PrelookupStudio blockin0out0out1
Original Lemonergy interface view. Lines identify ports; they are not a completed simulation circuit.
Ports and observed outputs
NameDirectionUnitMeaning
in0input1Value; real scalar.
out0output1Cell index; u32 scalar.
out1output1Fraction; real scalar.

Parameters

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

Configuration fields
ParameterUnitDefaultMeaning and limits
Outside table
params[0]		100 clamp to end values; 1 linear extrapolation.
Breakpoints
tables[0]		1[0, 10, 20]Configured coefficients or initial values in column-major order.

Equations and rules

  • f = (u − breakpoint[k])/(breakpoint[k + 1] − breakpoint[k])

Worked example

Prelookup — worked example

Value = 15. Cell index at 0 s = 1; Fraction at 0 s = 0.5.

Open Studio example after release →
Numerical checks for the bundled synthetic example
OutputTime (s)Expected valueUnitAbsolute tolerance
Cell index
out0		0111e-08
Fraction
out1		00.511e-08

Explore the recorded outputs

Prelookup recorded example

Prelookup / Cell index
Prelookup / Cell index against timeRecorded synthetic simulation values. Time in seconds; output in —.0.500.750.2510.51.250.751.51—Time (s)
Prelookup / Cell index: 1 — at 0 s

2 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

Prelookup — worked example

Locates a breakpoint interval and computes the input’s fraction within it.

  1. Prelookup: f = (u − breakpoint[k])/(breakpoint[k + 1] − breakpoint[k]). 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.

Scientific and mathematical references

These sources explain the scientific and mathematical background. The behavior, interface and limits above define the Lemonergy implementation; a citation does not imply every model option in the source is implemented.

  1. NIST Digital Library of Mathematical Functions, §3.3 Interpolation

    National Institute of Standards and Technology

    Technical reference · Interpolation formulas, including linear interpolation equation 3.3.14.

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)