Repository owner: Jon Lo Kim Lin (jlokimlin)

fishpack

Finite-difference solvers for separable elliptic partial differential equations.

Repository · Pinned source (9dc7d2e7a847) · Try in playground · Checked package example

GAMS classifications

About this package

Category: Differential equations
License: UCAR AND MIT

Topics: finite-differences, helmholtz-equation, partial-differential-equations, poisson-equation

Package dependencies

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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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hwscrt

Module: fishpack

I2: verified

Derivatives / callbacks: not applicable; sampled forcing and boundary values supplied

Centered-grid finite-difference solver for separable two-dimensional Poisson/Helmholtz equations. Checked six rectangular-grid Poisson/Helmholtz solves with nonzero Dirichlet values, exact discrete eigenmode solutions, preserved boundaries, independently evaluated five-point residuals and second-order mesh refinement. Other boundary modes and positive shifts remain unverified.

Pinned source: src/centered_cartesian_solver.f90

Author examples/tests: examples/thwscrt.f90

Load checked GAMS driver: gams-fishpack-helmholtz-reference