The l-bfgs-b package

[Tags:bsd3, library]

Bindings to L-BFGS-B, Fortran code for limited-memory quasi-Newton bound-constrained optimization.

L-BFGS-B is a Fortran library for limited-memory quasi-Newton bound-constrained optimization written by Ciyou Zhu, Richard Byrd, Jorge Nocedal and Jose Luis Morales. More information can be found on its homepage, or in [1].

The L-BFGS-B Fortran code is not included in this package, as I consider it a dependency. This package expects to be able to link against version 3.0 of the L-BFGS-B code, as built by a relatively recent version of gfortran. Instructions on how to build L-BFGS-B as a shared library can be found at

The functions provided in this package wrap FFI calls in unsafePerformIO, which among other things means that the called L-BFGS-B code should not output anything. The relevant iprint flag is thus set negative to suppress output as specified in the L-BFGS-B code. However, there are two places in said code where the flag is ignored and output still occurs. If it bothers you that code exposed as pure prints things, see for information on a simple patch for L-BFGS-B. The SciPy project has described the same behavior in

The code assumes that your Haskell compiler's Doubles are IEEE-754 doubles.

Example on usage can be found in the included examples directiory.

The current version has only been lightly tested, and should not be trusted for serious work. Feedback is appreciated.

Changes in version

Changes in version 0.1:


[1] R. H. Byrd, P. Lu and J. Nocedal. A Limited Memory Algorithm for Bound Constrained Optimization, (1995), SIAM Journal on Scientific and Statistical Computing , 16, 5, pp. 1190-1208.


Versions 0.1,
Dependencies base (==4.*), vector [details]
License BSD3
Copyright 2013-2014 Gard Spreemann
Author Gard Spreemann
Maintainer Gard Spreemann <>
Category Math
Home page
Uploaded Thu Jul 3 18:59:47 UTC 2014 by GardSpreemann
Distributions NixOS:
Downloads 572 total (6 in the last 30 days)
0 []
Status Docs not available [build log]
All reported builds failed as of 2016-12-14 [all 8 reports]
Hackage Matrix CI


  • Numeric
    • Numeric.LBFGSB
      • Numeric.LBFGSB.Convenience
      • Numeric.LBFGSB.Result


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