A program for optimizing "Lipari-Szabo model free" parameters to
heteronuclear relaxation data
Current version is 4.20
© Copyright 1998, Arthur G. Palmer, III.
Modelfree4 is now available as compiled executables for Linux and Macintosh OSX operating
systems. Separate executables are provided for Macintosh PowerPC and Intel CPUs. Separate linux exectuables are provided as
compiled with the gnu gfortran compiler and the Portland Group Fortran compiler.
If you download ModelFree4 and decide to use it, then please email email@example.com, so that we can add you to our users list. This way we can reach you with bug reports and updates. If you download the program, please check this site frequently for
updates in case of bug fixes (and please send email regarding any bugs you think
If you need access to source code or executables for other computer architectures, please contact Arthur G. Palmer (firstname.lastname@example.org).
- 4.00 (04/15/98) Initial version
- 4.01 (07/15/99) Fixed errors in F-statistic distributions
- 4.10 (02/4/00) Fixed additional errors in chi2 and F-statistic
distributions, added uncertainties to CSA for error analysis, added the relaxation
interference rate constant ratio as an optional
- 4.15 (04/10/02) Fixed errors due to type checking. Fixed flush-to-zero flag
for SGI R12000 chip
- 4.16 (07/02/04 Type declarations fixed. Present version can be compiled
by GNU g77
- 4.20 (11/12/06) Ended support for SGI platform. Only linux and
mac OSX are supported platforms at present. Fixed termination criteria and
simulated distribution of F-statistic error. A bug identified by Edward d'Auvergne that caused the minimization
algorithm to terminate inappropriately after an unsuccessful optimization step has been fixed. A bug in the test for
whether bounded parameters could be returned to the active set has been fixed. Changed grid search so the exact upper and lower
bounds are not grid search points. Maximum number of residues was increased to 300.
the Modelfree Manual
ModelFree4 for Mac OSX.
ModelFree4 for Linux OS.
Over to the
Inertia and Diffusion Tensors page
Over to the CurveFit page
Over to the relax_scripts page
Palmer Group Home Page
Updated 9/05/06 by Arthur G. Palmer (email@example.com)