This issue is meant for a central place for our Fortran (almost exclusively F77) codebase to track per module and if possible remove depending on contributor affinity to the subject matter and fortran-fu.

List has projected effort required just based on code length hence involves prejudice.

• scipy.integrate:
  • dop Replaced in ENH:MAINT:integrate: Rewrite DOP F77 code in C #21683
  • mach Will be deleted
  • ODEPACK: Convert : Hard
  • VODE/ZVODE Convert : Hard
  • QUADPACK: Replaced in ENH:integrate: Rewrite QUADPACK in C #21201
• scipy.interpolate
  • FITPACK: Convert : Moderate-Hard ENH: interpolate: replicate splrep and splprep in Python #19970 (also, modernized f90 implementation https://github.com/perazz/fitpack)
• scipy.io
  • Test Fortran : Replaced in MAINT: port _test_fortran.f to Python functions in test_fortran.py #23223
• scipy.linalg
  • lu.f: Replaced in ENH:MAINT:linalg:lu Cythonized and ndarray support added #18358
  • det.f: Replaced in ENH:MAINT:linalg det in Cython and with nDarray support #18225
  • interpolative or id_dist: Replaced in ENH: linalg: Cythonize id_dist FORTRAN code #20558
  • blas: Convert: Very Hard (Depends on BLAS/LAPACK lib) A lot of historical wrapper inconsistencies
  • lapack: Convert : Very Hard (Depends on BLAS/LAPACK lib) A lot of historical wrapper inconsistencies
• scipy.odr
  • odrpack: Convert : Moderate ENH: odr: upgrade to ODRPACK95 (port to Python or beyond...) #7107
• scipy.optimize
  • nnls: Replaced ENH:optimize: Rewrite nnls in Python #18570
  • cobyla :Replaced in ENH: Replace Fortran COBYLA with Python version from PRIMA #22350
  • L-BFGS-B: Replaced in ENH: optimize: Rewrite LBFGSB in C #21314
  • MINPACK: Replaced in ENH:optimize: Rewrite MINPACK in C #21131
  • minpack2: Replaced in MAINT: port minpack2.dcsrch from Fortran to Python, remove Fortran code #19060
  • SLSQP: Replaced in ENH:MAINT:optimize: Rewrite SLSQP and NNLS in C #22524
• scipy.sparse.linalg
  • ARPACK Replaced in ENH:MAINT: sparse.linalg: rewrite ARPACK in C #22748
  • iterative: Replaced in MAINT:ENH:sparse.linalg: Rewrite iterative solvers in Python #18488
  • PROPACK : Replaced in ENH:MAINT: sparse.linalg: Rewrite PROPACK in C #23531
• scipy.special
  • AMOS: Replaced in ENH:MAINT:special:Rewrite amos F77 code #19587
  • cdflib: Replaced in ENH:MAINT:special:Cythonize cdflib #19560
  • mach: Deleted
  • specfun: Replaced in ENH:Rewrite specfun F77 code in C #19824
• scipy.stats
  • statlib: Replaced in MAINT:stats:Cythonize and remove Fortran statlib code #18679
  • mvndst: implemented in ENH: stats.multivariate_t: add cdf method #17410, being made public in MAINT: stats: remove mvn fortran calls from multivariate_normal.cdf #22298 and MAINT: stats: rewrite gaussian_kde.integrate_box, remove _mvn F77 extension #22611