Procedures Related to the Zadeh's Extension Principle for Fuzzy Data R package ZEP version 0.3.1 Procedures for calculation, plotting, animation, and approximation of the outputs for fuzzy numbers (see A.I. Ban, L. Coroianu, P. Grzegorzewski "Fuzzy Numbers: Approximations, Ranking and Applications" (2015)) based on the Zadeh's Extension Principle (see de Barros, L.C., Bassanezi, R.C., Lodwick, W.A. (2017) <doi:10.1007/978-3-662-53324-6_2>). Software Depends: R (>= 3.5.0) Imports: FuzzyNumbers, methods, animation, grDevices Suggests: testthat (>= 3.0.0) Maciej Romaniuk <mroman@ibspan.waw.pl> Comprehensive R Archive Network (CRAN) Maciej Romaniuk [cre, aut] (ORCID: <https://orcid.org/0000-0001-9649-396X>, (Systems Research Institute Polish Academy of Sciences, Newelska 6, 01-447 Warszawa, Poland)), Abbas Parchami [aut] (ORCID: <https://orcid.org/0000-0002-0593-7324>, (Mahani Math Center, Afzalipour Research Institute, Shahid Bahonar University of Kerman, Kerman, Iran, Department of Statistics, Faculty of Mathematics and Computer, Shahid Bahonar University of Kerman, Iran)), Przemyslaw Grzegorzewski [aut] (ORCID: <https://orcid.org/0000-0002-5191-4123>, (Faculty of Mathematics and Information Science, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland)) GPL-3 2025-10-30 application/tgz https://CRAN.R-project.org/package=ZEP doi:10.32614/CRAN.package.ZEP