> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Tracked Parameters from Optimization

**What it does:** The **Tracked Parameters from Optimization** block extracts all the non-design parameters that were logged during the optimization run from a Parameter Optimization Result at a specific iteration. This is done to analyze auxiliary data, for example stresses, temperatures, or volumes, as the optimization progressed, providing a deeper understanding of the solution's performance evolution.

**Common uses:**

* Plotting the evolution of secondary metrics (e.g., mass, reaction forces) against the primary objective to confirm the design's overall effectiveness.
* Examining the values of critical parameters throughout the run to diagnose why the optimization may have stalled or violated a hidden constraint.

**Tips:**

* The *Iteration* input is optional. If left empty, the block will automatically use the final iteration of the optimization.

***

Extracts all tracked parameters at a specific iteration from a Parameter Optimization Result.

### Inputs

| Name      | Type                                                                                                 | Description                                                                                                          |
| --------- | ---------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------- |
| Result    | [Parameter Optimization Result](../../../../block-documentation/types/parameter-optimization-result) | Result to extract the tracked parameters from.                                                                       |
| Iteration | [Integer](../../../../block-documentation/types/integer)                                             | Iteration number which the Parameter Group will be extracted from. If not provided, the last iteration will be used. |

### Outputs

| Type                                                                     |
| ------------------------------------------------------------------------ |
| [Parameter Group](../../../../block-documentation/types/parameter-group) |