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authFullName_s : Philippe Toint

A note on inexact inner products in GMRES

Serge Gratton , Ehouarn Simon , David Titley-Peloquin , Philippe Toint
SIAM Journal on Matrix Analysis and Applications, 2022, 43 (3)
Journal articles hal-03637231v1

Guaranteeing the convergence of the saddle formulation for weakly constrained 4D‐Var data assimilation

Serge Gratton , Selime Gürol , Ehouarn Simon , Philippe Toint
Quarterly Journal of the Royal Meteorological Society, 2018, 144 (717), pp.2592-2602. ⟨10.1002/qj.3355⟩
Journal articles hal-02959392v1

Differentiating the Method of Conjugate Gradients

Serge Gratton , David Titley-Peloquin , Philippe Toint , Jean Tshimanga Ilunga
SIAM Journal on Matrix Analysis and Applications, 2014, 35 (1), pp.110--126. ⟨10.1137/120889848⟩
Journal articles hal-03224134v1

Conjugate-gradients versus multigrid solvers for diffusion-based correlation models in data assimilation

Serge Gratton , Philippe Toint , Jean Tshimanga Ilunga
Quarterly Journal of the Royal Meteorological Society, 2014, 139 (675), pp.1481--1487
Journal articles hal-03224130v1
Image document

Quasi-Newton updates with weighted secant equations

Serge Gratton , Vincent Malmedy , Philippe Toint
Optimization Methods and Software, 2015, 30 (4), pp.748-755. ⟨10.1080/10556788.2014.971025⟩
Journal articles hal-02147968v1
Image document

An algorithm for the minimization of nonsmooth nonconvex functions using inexact evaluations and its worst-case complexity

Serge Gratton , Ehouarn Simon , Philippe Toint
Mathematical Programming, Series A, 2020, ⟨10.1007/s10107-020-01466-5⟩
Journal articles hal-02943960v1

A note on preconditioning weighted linear least-squares, with consequences for weakly constrained variational data assimilation

Serge Gratton , Selime Gürol , Ehouarn Simon , Philippe Toint
Quarterly Journal of the Royal Meteorological Society, 2018, 144 (712), pp.934-940. ⟨10.1002/qj.3262⟩
Journal articles hal-02959395v1

Issues in making the weakly-constrained 4DVar formulation computationally efficient

Serge Gratton , Selime Gurol , Ehouarn Simon , Philippe Toint
Griewank, Andreas; Reich, Sebastian; Roulstone, Ian; Stuart, Andrew. Mathematical and Algorithmic Aspects of Data Assimilation in the Geosciences, 13 (4), Mathematisches Forschungsinstitut Oberwolfach, pp.2705-2748, 2017, Oberwolfach Reports, ISSN: 1660-8933. ⟨10.4171/OWR/2016/47⟩
Book sections hal-03176447v1

Minimizing convex quadratics with variable precision conjugate gradients

Serge Gratton , Ehouarn Simon , David Titley-Peloquin , Philippe Toint
Numerical Linear Algebra with Applications, 2021, 28 (e2337)
Journal articles hal-02959082v1
Image document

Exploiting variable precision in GMRES

Serge Gratton , Ehouarn Simon , David Titley-Peloquin , Philippe Toint
2020
Preprints, Working Papers, ... hal-02943241v1
Image document

Les algorithmes et la puissance de calcul dans les techniques de prévision pour les géosciences en grande dimension vus sous l'angle de l'optimisation mathématique

Serge Gratton , Selime Gürol , Ehouarn Simon , Philippe Toint
Colloque Modélisation : succès et limites (2016), Dec 2016, Paris, France. pp.37-47
Conference papers hal-03636585v1

Observation thinning in data assimilation computations

Serge Gratton , Monserrat Rincon-Camacho , Ehouarn Simon , Philippe Toint
EURO Journal on Computational Optimization, 2015, 3 (1), pp.31-51. ⟨10.1007/s13675-014-0025-4⟩
Journal articles hal-02960628v1