fea.compare — Compare two persisted RunMat FEA runs.
fea.compare(baselineRunId, candidateRunId) compares summary, status, quality, iteration, and timing evidence for two persisted RunMat FEA runs. This is a native RunMat API.
Syntax
comparison = fea.compare(baselineRunId, candidateRunId)Inputs
| Name | Type | Required | Default | Description |
|---|---|---|---|---|
baselineRunId | StringScalar | Yes | — | Baseline persisted run id. |
candidateRunId | StringScalar | Yes | — | Candidate persisted run id. |
Returns
| Name | Type | Description |
|---|---|---|
result | Any | FEA object or operation result. |
Errors
| Identifier | When | Message |
|---|---|---|
RunMat:fea:LoadFailed | A .fea document cannot be read, parsed, or resolved. | fea: failed to load FEA document |
RunMat:fea:InvalidInput | A builtin receives an unsupported argument pattern or object type. | fea: invalid input |
RunMat:fea:OperationFailed | A validation, planning, run, result-query, comparison, or trend operation fails. | fea: operation failed |
RunMat:fea:Internal | An FEA object or operation result cannot be converted to a RunMat value. | fea: internal error |
How fea.compare works
- Exactly two text run identifiers are required;
fea.comparedoes not accept Name, Value options. - Both run identifiers are resolved before the results-comparison operation executes.
- Count and count-delta fields are structural signed integers. Timing deltas remain binary64 physical measurements.
- Numeric and resident numeric inputs have no role and are rejected before artifact-store access.
Example
Compare two persisted runs
comparison = fea.compare("run_baseline", "run_candidate");Using fea.compare with coding agents
Open a RunMat example with live inputs, then ask the agent to explain how fea.compare changes the result.
Run a small fea.compare example, explain the result, then change one input and compare the output.
FAQ
Can comparison options follow the run identifiers?⌄
No. The current builtin accepts exactly two run identifiers and no options.
Related Fea functions
fea.boundaryCondition · fea.domain · fea.field · fea.interface · fea.loadCase · fea.material · fea.materialAssignment · fea.model · fea.plan · fea.plot · fea.results · fea.run · fea.runOptions · fea.step · fea.study · fea.sweep · fea.trends · fea.validate
Open-source implementation
Unlike proprietary runtimes, every RunMat function is open-source. Read exactly how fea.compare is executed, line by line, in Rust.
- View the source for fea.compare in Rust on GitHub
- Learn how the RunMat runtime works
- Found a bug? Open an issue with a minimal reproduction.
About RunMat
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