Additions, changes, in January 2019. The toolbox SSMMATLAB has undergone some changes. All functions dealing with Kalman fintering and smoothing have been revised and some bugs have been corrected. Some new demos have been incorporated. The new book, called 'Linear Time Series With Matlab and Octave', forthcoming in the Statistics and Computing Series of Springer Verlag, and the SSMMATLAB manual have been updated to accommodate the changes in the programs.