Claude/sciml rosenbrock mass matrix gczms #101
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Investigate which Rosenbrock-W methods support mass matrices: - ROS34PW2, ROS34PW3: ✓ Work with general mass matrix (1.24-1.32x faster than Rodas5P) - ROS34PW1a, ROS34PW1b: ✓ Work but take more steps - Rosenbrock23, Rosenbrock32: ✗ Diagonal mass matrix only ROS34PW3 wins on longer simulations with 39% fewer function evaluations due to W-method Jacobian reuse strategy.
ROS34PW1a is an L-stable 4th order Rosenbrock-W method that: - Supports general (non-diagonal) mass matrices - Aggressively damps stiff transients (R∞ = 0) - Uses fewer function evaluations on very stiff circuits Removed temporary test scripts from investigation.
ROS34PW2 is a 4th order A-stable Rosenbrock-W method that is: - Stiffly accurate (handles algebraic constraints in mass matrix DAEs) - Faster than Rodas5P on moderately stiff circuits (graetz) - Uses W-method Jacobian reuse for fewer linear solves
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