Resumen: The present paper presents some results that allow us to perform with High Relative Accuracy linear algebra operations with correlation and covariance matrices of Gaussian Markov Random Fields over graphs of paths. Some numerical experiments are carried out showing the computational benefits of this approach. Idioma: Inglés DOI: 10.1016/j.cam.2024.116142 Año: 2024 Publicado en: Journal of Computational and Applied Mathematics 453 (2024), 116142 [12 pp.] ISSN: 0377-0427 Factor impacto JCR: 2.6 (2024) Categ. JCR: MATHEMATICS, APPLIED rank: 35 / 343 = 0.102 (2024) - Q1 - T1 Factor impacto SCIMAGO: 0.688 - Computational Mathematics (Q2) - Applied Mathematics (Q2)