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Changelog

Source: NEWS.md

lbfgsb3c 2026-3.5 changes

CRAN release: 2026-10-06

  • Added a thread-safe C++ port of the L-BFGS-B 3.0 Fortran code (the Fortran is kept and remains the default). It keeps no shared mutable state and does not call the R API, so independent problems can be solved concurrently (for example as an inner optimizer in an OpenMP loop). The port reproduces the Fortran results exactly. Its workspace is allocated once per thread and reused (zeroed per run), so memory scales with the number of threads, not the number of optimizations.

  • The C++ port is available from C/C++ as lbfgsb3Cts (the second element of .lbfgsb3cPtr(), set up by iniLbfgsb3 in lbfgsb3ptr.h) and from R with lbfgsb3c(..., control = list(engine = "cpp")).

  • lbfgsb3C_ no longer stores its $info result in a global R list.

  • lmm is now validated. lbfgsb3c() errors unless it is a whole number >= 1; the C entry points return fail = 29 (“ERROR: INVALID LMM”) instead of dividing by zero (lmm <= 0) or overflowing the workspace size (very large lmm). n <= 0 returns fail = 13 before any work arrays are allocated.

  • Nested lbfgsb3c() calls (an objective that runs its own optimization) now work: the R callbacks are kept per call instead of in globals that the inner call overwrote. A gradient of the wrong length is now an error instead of a read past its end.

  • Added src/Makevars (OpenMP for the internal thread-safety test helper, and explicit $(FLIBS)).

  • Removed the unused timer.f (its cpu_time call left an unresolved symbol with flang 21+), and the vignette no longer calls pkgbuild::compile_dll() (it failed when checked outside the source tree).

  • control$reltol is now checked for length one (the check tested abstol instead, so an empty reltol was read out of bounds).

lbfgsb3c 2024-3.4 changes

CRAN release: 2024-04-04

  • LTO fixes and remove unused code for Fortran fixes

lbfgsb3c 2024-3.3 changes

CRAN release: 2024-04-01

  • Fixed lmm. In prior version with the R interface lmm was not being passed through correctly (though it was passed through in C correctly)

  • Fixed some bugs in printout

  • Reverted the code to fix some of the issues in the FORTRAN code

lbfgsb3c 2020-3.3 changes

CRAN release: 2023-11-28

  • Now allow rho=NULL to work the same as if rho was not supplied

  • Be More careful about $convergence by adding a default value of NA_INTEGER

  • $convergence is now an integer instead of a real number

  • Fix too many arguments for format as requested by CRAN

  • Added a NEWS.md file to track changes to the package.

lbfgsb3c 2020-3.2 prior changes and information

CRAN release: 2020-03-03

To do

Add test using a plain C function for optimization. lbfgsb3c is supposed to handle this.

2019-03-19 o Packages lbfgsb3 and lbfgsb3c merged into latter. Vignette added. o Suppressed printout when trace>2 and starting (f not defined)

2015-01-20 o Fixup line longer than 72 chars in lbfgsb.f. Undeclared integer itask in errclb subroutine. Thanks to Berend Hasselman.

New package lbfgsb3 2014.7.31