  In most fuzzy control applications (applying classical fuzzy reasoning), the
reasoning method requires a complete fuzzy rule-base, i.e all the possible
observations must be covered by the antecedents of the fuzzy rules, which is
not always available. Fuzzy control systems based on the Fuzzy Rule
Interpolation (FRI) concept play a major role in different platforms, in case
if only a sparse fuzzy rule-base is available. This cases the fuzzy model
contains only the most relevant rules, without covering all the antecedent
universes. The first FRI toolbox being able to handle different FRI methods was
developed by Johanyak et. al. in 2006 for the MATLAB environment. The goal of
this paper is to introduce some details of the adaptation of the FRI toolbox to
support the GNU/OCTAVE programming language. The OCTAVE Fuzzy Rule
Interpolation (OCTFRI) Toolbox is an open-source toolbox for OCTAVE programming
language, providing a large functionally compatible subset of the MATLAB FRI
toolbox as well as many extensions. The OCTFRI Toolbox includes functions that
enable the user to evaluate Fuzzy Inference Systems (FISs) from the command
line and from OCTAVE scripts, read/write FISs and OBS to/from files, and
produce a graphical visualisation of both the membership functions and the FIS
outputs. Future work will focus on implementing advanced fuzzy inference
techniques and GUI tools.
