lemonergy· battery engineering courses

Lemonergy · Studio block

Direct N-D lookup

Selects an exact table element using zero-based multidimensional indices.

Implementation ID
native-direct-lookup
Reviewed
2026-10-27

Behavior

linear index = i₀ + n₀ i₁ + n₀ n₁ i₂ + …. The worked example connects this operation to signals in Lemonergy Studio.

Interface

Direct N-D lookup interfaceInputs or arguments on the left, observed outputs on the right. Conserving terminals appear below the component. The tables give units and behavior.Direct N-D lookupStudio blockin0out0
Original Lemonergy interface view. Lines identify ports; they are not a completed simulation circuit.
Ports and observed outputs
NameDirectionUnitMeaning
in0input1Indices; u32 2 array.
out0output1Value; real scalar.

Parameters

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

Configuration fields
ParameterUnitDefaultMeaning and limits
First axis size
params[0]		12Configured finite numerical parameter.
Second axis size
params[1]		12Configured finite numerical parameter.
Table values
tables[0]		1[10, 20, 30, 40]Configured coefficients or initial values in column-major order.

Equations and rules

  • linear index = i₀ + n₀ i₁ + n₀ n₁ i₂ + …

Worked example

Direct N-D lookup — worked example

Indices = [1,0]. Value at 0 s = 20.

Open Studio example after release →
Numerical checks for the bundled synthetic example
OutputTime (s)Expected valueUnitAbsolute tolerance
Value
out0		02011e-08

Explore the recorded outputs

Direct N-D lookup recorded example

Direct N-D lookup
Direct N-D lookup against timeRecorded synthetic simulation values. Time in seconds; output in —.19019.50.25200.520.50.75211—Time (s)
Direct N-D lookup: 20 — 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

Direct N-D lookup — worked example

Selects an exact table element using zero-based multidimensional indices.

  1. Direct N-D lookup: linear index = i₀ + n₀ i₁ + n₀ n₁ i₂ + …. 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)