FORTRAN SOFTWARE CATALOG

Repository owner: Federico Perini (perazz)

twopnt

Boundary-value problem solver with adaptive grids and a modern object interface.

Repository · Pinned source (4ce477215f84) · Try in playground · Checked package example

GAMS classifications

About this package

Category
Differential equations
License
MIT

Topics: adaptive-grids, boundary-value-problem, boundary-value-problems, bvp, differential-equations, fortran

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

No additional GitHub package dependencies were recorded for this verified build.

Build record verified 2026-10-27.

Used by (0 selected packages)

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Reviewed procedures

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TwoPntBVProblem%run

Module: twopnt_core

I1b

I1b: source-supported

Derivatives / callbacks: problem residual and configured Jacobian handling

Adaptive boundary-value solution; retain I1b rather than infer linearity for all supported problems. A manufactured Poisson probe u_second_derivative=-2 with zero endpoints failed the full-profile/residual checks: the pinned solver reports success but returns the preceding iterate (the zero initial guess on the linear problem). The convergence exit occurs before v0=v1 in search. Failed source/output are retained under docs/gams-candidates/twopnt; this probe is not a verified driver and no library patch has been applied.

Pinned source: src/twopnt_core.f90