Fréchet Distance-Based K-Means and Extensions for Longitudinal Data R package FKmL version 0.1.1 Implements shape-based clustering algorithms for multidimensional longitudinal data based on the Fréchet distance. It implements two main methods: MFKmL (Multidimensional Fréchet distance-based K-means for Longitudinal data), an extension of the K-means algorithm using the Fréchet distance originally developed in the 'kmlShape' package, adapted for multidimensional trajectories; and SFKmL (Sparse multidimensional Fréchet distance-based K-medoids for Longitudinal data), a K-medoids-based clustering algorithm that incorporates variable selection. These tools are designed to enhance clustering performance in high-dimensional longitudinal data settings, particularly those with time delays, variations in trajectory speed, irregular sampling intervals, and noise. This package implements methods derived from Kang et al. (2023) <doi:10.1007/s11222-023-10237-z>. Software Depends: R (>= 4.3) Imports: dplyr, ggplot2, proxy, abind Ji Hyun Park <jhn1105@gmail.com> Comprehensive R Archive Network (CRAN) Ji Hyun Park [aut, cre], Soon-Sun Kwon [aut], Ilsuk Kang [aut, ctb] GPL (>= 2) 2025-07-02 application/tgz https://CRAN.R-project.org/package=FKmL doi:10.32614/CRAN.package.FKmL