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casadi-ipopt-nlp

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Nonlinear optimization with CasADi and IPOPT solver. Use when building and solving NLP problems: defining symbolic variables, adding nonlinear constraints, setting solver options, handling multiple initializations, and extracting solutions. Covers power systems optimization patterns including per-unit scaling and complex number formulations.

tasks/energy-ac-optimal-power-flow/environment/skills/casadi-ipopt-nlp/SKILL.md

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# CasADi + IPOPT for Nonlinear Programming

CasADi is a symbolic framework for nonlinear optimization. IPOPT is an interior-point solver for large-scale NLP.

## Quick start (Linux)

```bash
apt-get update -qq && apt-get install -y -qq libgfortran5
pip install numpy==1.26.4 casadi==3.6.7
```

## Building an NLP

### 1. Decision variables
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