GSLIB - History

Log of Changes to GSLIB

This is a log of changes, bug fixes, and new features to the GSLIB programs. The FORTRAN 77 code in the second edition of GSLIB, published by Oxford University Press, is the official version of GSLIB. Since the start of 1998, changes have been made to the official version. The source code of these changes has not been released to the public, although PC executables have been. The source code is reserved for sponsors of the Centre for Computational Geostatistics (CCG). The source code will be released with the third edition planned (tentatively) for 2003.

To summarize the transition from FORTRAN 77 (F77) to FORTRAN 90 (F90):

Initial conversion to F90 undertaken in summer of 1998 when dynamic memory allocation and command line specification of the parameter file was coded. The version number was set to 2.900. All bug fixes and maintenace considered the F90 versions from that time forward. The F77 versions were not kept up to date.
The only change to the parameter files was in sgsim/sisim where the size of the covariance lookup table appears after the search specification. A "template" parameter file can always be generated by executing the program and entering return (in a directory where there is no parameter file).
Bug fixes through summer of 1999 when provision was made for long file names (512 characters) and file names with blanks. This is more compliant with Windows file naming conventions. The version number was set to 2.901 in the fall.
Bug fixes and enhancements continued through March 2000 with the version number being incremented in selected programs. Some programs reached a version number of 2.904.
In March 2000, the programs were revisited to correct minor bugs (ik3d for example) and to add error checking (in the variable number of the variogram programs for example). The version number was reset to 2.905 and the source code was then released at the March 2000 CCG meeting and put on the www.gslib.com website.

Changes since 2.905

Date	Programs	Version
March 16, 2000	locmap	2.906
Feature added to permit symbols with no lines around them. The label option should be set to -1 for this. Of course, that means that one cannot plot a label AND no line at the same time. When there is a reason to skip the line, there are too many symbols for labels.
March 16, 2000	backtr	2.906
Bug determining size of transformation table fixed.
April 25, 2000	sgsim/sisim/sisim_gs/sisim_lm	2.906
Multiple grid search changes. Changed to -imult instead of +imult due to search according to descending order.
April 25, 2000	kt3d	2.906
Changed to use local mean in kriging estimate, that is, option 2 was not fully functional before.
May 1, 2000	kb2d	2.906
Changed to correct Lagrange parameter in calculation of kriging variance and to correct the use of range parameter in exponential and Gaussian variogram models.
May 9, 2000	All with grid output	2.907
Modified programs that output a grid to write nx/ny/nz after "nvar" specification on the second line of the output file.
May 10, 2000	ik3d
Modified to handle kriging with one grid node.