For the full log of gretl changes since January 2000, see
<@url="http://gretl.sourceforge.net/ChangeLog.html">.

2026-10-12 version 2026c
- new addons kmeans and PairPlot, from A. Tarassow's
  function packages of the same names, with various
  enhancements and speedups
- new function kmeans(): algorithm ASA136 for the k-means
  problem
- new function permute(): calculate all permutations of a
  vector of up to 8 elements
- "fcast" command: introduce the --exponentiate and
  --integrate options for forecasting levels from a model in
  logarithms and/or first differences
- matrix code: drop the experimental hand-crafted OpenMP
  paths for multiplication, X'X and element-wise add/subtract,
  relying on the BLAS and native single-threaded code; lower
  the default blas_mnk_min threshold to 80000 accordingly
- extra addon: new function convex_hull()
- the "omp_mnk_min" set-variable is now an obsolete no-op
- GUI: promote the "Packages" entry to top level
- GUI: forecast from single-equation model, support write
  and copy in CSV format
- GUI: fix for call to function package with no arguments
- GUI: fix for the options shown in connection with making
  a forecast from a model
- use of "to" in a range-of-lags expression: support this
  in a wider range of contexts
- recession bars in time-series plots: extend support of
  this feature to daily data
- enhance functionality of ui-maker for function packages
- fix bug: GUI plot editor breaks factorized plots
- fix bug: crash in GUI data editor on Windows
- fix bug: correlation matrix heatmap broken if the
  graph-name of an included series contains '%'
- fix bug: crash in adf test on panel data when the
  --difference option is given
- fix bug: potentially incorrect output from xtab when
  given string-valued series as input
- fix bug: potential crash or memory leak with the "smpl"
  command in certain cases of compounding restrictions
- fix bug: possible crash in the "bds" command under certain
  conditions
- gretl_edit: support loading of function definitions and
  emacs-style "jump to declaration"
- MS Windows: update doc regarding use of MS-MPI
