Fix Van der Pol Jacobian calculation #159
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The partial derivative ∂f₂/∂x was incorrect. For the Van der Pol equation: f₂ = μ * ((1 - x²) * y - x) The correct partial derivative is: ∂f₂/∂x = μ * (-2xy - 1) The previous implementation was missing the y term in the derivative. This fixes the failing test in OrdinaryDiffEq.jl CI. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
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Summary
μ * (-2x - 1)toμ * (-2xy - 1)Details
The Van der Pol equation is:
The Jacobian element J[2,1] = ∂f₂/∂x should be:
The previous implementation incorrectly calculated this as
μ * (-2x - 1), missing the y term.Test Plan
🤖 Generated with Claude Code