Functional Shannon Entropy for Virome Mutational Analysis R package MetaEntropy version 1.3 Estimates Shannon entropy, per gene and per genomic position, associated with non-synonymous mutation frequencies in viral populations, such as wastewater samples. The package uses codon translations for functional insights. Each amino acid can be treated as an individual state, resulting in a 20-state entropy computation, or grouped into one of six physicochemical classes, adding further functional context. Provides normalized values (0-1 scale) to facilitate the direct comparison of different genomic positions or total functional entropy across multiple metagenomes. Designed to analyze mutational data using tabular 'Single Nucleotide Variant' (SNV) frequency tables generated by variant callers (e.g., 'iVar' or 'LoFreq'), operating independently of consensus sequence estimation and multiple sequence alignment. Software Depends: R (>= 4.1.0) Imports: ggplot2, patchwork, beeswarm, knitr Suggests: rmarkdown Leandro Roberto Jones <lrj000@gmail.com> Comprehensive R Archive Network (CRAN) Leandro Roberto Jones [aut, cre] (ORCID: <https://orcid.org/0000-0002-5877-4194>), Julieta Marina Manrique [aut] (ORCID: <https://orcid.org/0000-0001-8712-6666>) MIT + file LICENSE (https://CRAN.R-project.org/package=MetaEntropy/LICENSE) 2026-03-09 application/tgz https://CRAN.R-project.org/package=MetaEntropy doi:10.32614/CRAN.package.MetaEntropy