FORTRAN SOFTWARE CATALOG

Repository owner: Ivan Pribec (ivan-pi)

stiff3

Adaptive third-order Rosenbrock solver for stiff autonomous ordinary differential equations.

Repository · Pinned source (70ab5c86c2ac) · Try in playground · Checked package example

GAMS classifications

About this package

Category
Differential equations
License
Apache-2.0

Topics: adaptive, adaptive-methods, differential, equation, fortran, ode, rosenbrock-methods, solver, stiff, stiff-equations

Package dependencies

Resolved GitHub repositories used by the verified playground build, combining direct and indirect dependencies. This list does not describe internal module dependencies or native system libraries.

Required by this build

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Build record verified 2026-10-28.

Used by (0 selected packages)

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Reviewed procedures

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stiff3

Module: stiff3_solver

I1a2

I1a2: verified

Derivatives / callbacks: user Jacobian in reviewed example

Third-order Rosenbrock integration for stiff autonomous initial-value systems. The checked I1a2 driver solves the shared autonomous system y1'= -1000*y1+999*y2, y2'= -y2 from [2,1], checking exact exponential modes at four output times. Only this stiff ODE configuration is verified; no DAE capability or general stiff-problem accuracy is established.

Pinned source: src/stiff3_solver.f90

Author examples/tests: example/hires.f90

Load checked GAMS driver: gams-stiff3-stiff-two-scale