Resumen: Gramian matrices with respect to inner products defined for Hilbert spaces supported on bounded and unbounded intervals are represented through a bidiagonal factorization. It is proved that the considered matrices are strictly totally positive Hankel matrices and their catalecticant determinants are also calculated. Using the proposed representation, the numerical resolution of linear algebra problems with these matrices can be achieved to high relative accuracy. Numerical experiments are provided, and they illustrate the excellent results obtained when applying the theoretical results. Idioma: Inglés DOI: 10.1002/nla.2550 Año: 2024 Publicado en: NUMERICAL LINEAR ALGEBRA WITH APPLICATIONS 31, 4 (2024), e2550 [21 pp.] ISSN: 1070-5325 Factor impacto JCR: 2.1 (2024) Categ. JCR: MATHEMATICS, APPLIED rank: 57 / 343 = 0.166 (2024) - Q1 - T1 Categ. JCR: MATHEMATICS rank: 31 / 483 = 0.064 (2024) - Q1 - T1 Factor impacto SCIMAGO: 0.757 - Algebra and Number Theory (Q1) - Applied Mathematics (Q2)