Namur Institute for Complex Systems

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    Belgium

Research Output 1977 2019

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Working paper
2019
2 Downloads (Pure)
File
Rain
Weather forecasting
Costs
13 Downloads (Pure)

Bernstein Concentration Inequalities for Tensors via Einstein Products

Luo, Z., Qi, L. & Toint, P., 11 Feb 2019, Arxiv, 12 p.

Research output: Working paper

File
Bernstein Inequality
Concentration Inequalities
Albert Einstein
Tensors
Tensor
3 Downloads (Pure)

Exploiting variable precision in GMRES

Gratton, S., Simon, E., Titley-Peloquin, D. & Toint, P., Jul 2019, 19 p.

Research output: Working paper

File
GMRES
Digital arithmetic
Arnoldi
Iterative Solver
Floating-point Arithmetic
13 Downloads (Pure)
File
Constrained optimization
Constrained Optimization
Sparsity
Higher Order
Evaluation
3 Downloads (Pure)
File
Derivatives
Evaluation
Adaptive algorithms
Nonconvex Minimization
Inexact Methods
2018
1 Downloads (Pure)

A note on solving nonlinear optimization problems in variable precision

Gratton, S. & Toint, P., 11 Dec 2018, Arxiv, 11 p.

Research output: Working paper

File
Function evaluation
Energy dissipation
Costs
Experiments

Inflation forecasts in the euro area: Are domestic and global factors useful in forecasting the mean and the distribution of euro area inflation?

Bereau, S., Faubert, V. & Schmidt, K., 2018, (Banque de France Working Papers series; no. 663).

Research output: Working paper

11 Downloads (Pure)

Minimizing convex quadratics with variable precision Krylov methods

Gratton, S., Simon, E. & Toint, P., 2018, (Submitted) Arxiv, 26 p.

Research output: Working paper

File
Krylov Methods
Quadratic Optimization
Cross product
Matrix Product
Conjugate Gradient
2 Downloads (Pure)
File
Derivatives
Costs
2017
2 Downloads (Pure)

On the use of the saddle formulation in weakly-constrained 4D-VAR data assimilation

Gratton, S., Gürol, S., Simon, E. & Toint, P., 20 Sep 2017, (Submitted) Arxiv.

Research output: Working paper

File
Data Assimilation
Saddle
Parallel processing systems
data assimilation
parallel computing
26 Downloads (Pure)

Worst-case evaluation complexity and optimality of second-order methods for nonconvex smooth optimization

Cartis, C., Gould, N. I. M. & Toint, P., 22 Sep 2017, Arxiv, 35 p.

Research output: Working paper

File
Newton-Raphson method
Optimality
Optimization
Function evaluation
Evaluation
2016
11 Downloads (Pure)

Quantifying the degree of average contraction of Collatz orbits

Carletti, T. & Fanelli, D., 21 Dec 2016, (Submitted) Namur center for complex systems, 18 p.

Research output: Working paper

File
Contraction
Orbit
Modulo
Integer
Iterate
2015
24 Downloads (Pure)

Improved worst-case evaluation complexity for potentially rank-deficient nonlinear least-Euclidean-norm problems using higher-order regularized models

Cartis, C., Gould, N. I. M. & Toint, P., 18 Nov 2015, 18 p. (naXys technical report).

Research output: Working paper

File
Euclidean norm
Local Minimizer
Vector-valued Functions
Taylor series
Criticality
Yield spread
Asset prices
Surprise
Credit rating
Price dynamics
10 Downloads (Pure)

Worst-case evaluation complexity for unconstrained nonlinear optimization using high-order regularized models

Birgin, E., Gardenghi, J., Martinez, J-M., Santos, S. A. & Toint, P., Jun 2015, 2015: Namur center for complex systems, 8 p. (naXys Technical Reports; vol. 05-2015).

Research output: Working paper

File
Unconstrained Optimization
Nonlinear Optimization
Higher Order
Derivatives
Derivative
2014
116 Downloads (Pure)
File
Interior Point
Nonlinear Optimization
Matrix Derivative
Merit Function
Quadratic Optimization
2013
12 Downloads (Pure)

Adaptive Observations And Multilevel Optimization In Data Assimilation

Gratton, S., Rincon-Camacho, M. & Toint, P., 2013, Namur: Namur center for complex systems, 18 p.

Research output: Working paper

File
data assimilation
decomposition
wave equation
weather
prediction
63 Downloads (Pure)
File
Unconstrained Minimization
Steepest Descent Method
Evaluation Function
Terminate
Iterate
2012

Sovereign bond spreads: the role of debt accumulation

Gnabo, J-Y. & Bernal Diaz, O., 2012, (Unpublished).

Research output: Working paper

2011
8 Downloads (Pure)
File
Forced oscillation
Integrable Systems
Numerical Algorithms
Search Algorithm
Initial conditions
2009
20 Downloads (Pure)
File