Ipopt (Interior Point OPTimizer, pronounced eye-pea-Opt) is a software package for large-scale ​nonlinear optimization. It is designed to find (local) solutions of mathematical optimization problems of the from min f(x), x in R^n s.t. g_L <= g(x) <= g_U, x_L <= x <= x_U, where f(x): R^n --> R is the objective function, and g(x): R^n --> R^m are the constraint functions. The vectors g_L and g_U denote the lower and upper bounds on the constraints, and the vectors x_L and x_U are the bounds on the variables x. The functions f(x) and g(x) can be nonlinear and nonconvex, but should be twice continuously differentiable. Note that equality constraints can be formulated in the above formulation by setting the corresponding components of g_L and g_U to the same value. Ipopt is part of the ​COIN-OR Initiative.

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  1. Blanquero, Rafael; Carrizosa, Emilio; Molero-Río, Cristina; Romero Morales, Dolores: Sparsity in optimal randomized classification trees (2020)
  2. Dan, Teodora; Lodi, Andrea; Marcotte, Patrice: Joint location and pricing within a user-optimized environment (2020)
  3. Fischetti, Matteo; Monaci, Michele: A branch-and-cut algorithm for mixed-integer bilinear programming (2020)
  4. Gleixner, Ambros; Maher, Stephen J.; Müller, Benjamin; Pedroso, João Pedro: Price-and-verify: a new algorithm for recursive circle packing using Dantzig-Wolfe decomposition (2020)
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  6. Jagtenberg, C. J.; Mason, A. J.: Improving fairness in ambulance planning by time sharing (2020)
  7. Kronqvist, Jan; Bernal, David E.; Grossmann, Ignacio E.: Using regularization and second order information in outer approximation for convex MINLP (2020)
  8. Liu, Xin-Wei; Dai, Yu-Hong: A globally convergent primal-dual interior-point relaxation method for nonlinear programs (2020)
  9. Mazari, Idriss; Nadin, Grégoire; Privat, Yannick: Optimal location of resources maximizing the total population size in logistic models (2020)
  10. Michel, Volker; Schneider, Naomi: A first approach to learning a best basis for gravitational field modelling (2020)
  11. Nerantzis, Dimitrios; Pecci, Filippo; Stoianov, Ivan: Optimal control of water distribution networks without storage (2020)
  12. Neumann, Christoph; Stein, Oliver; Sudermann-Merx, Nathan: Granularity in nonlinear mixed-integer optimization (2020)
  13. Steinboeck, Andreas; Guay, Martin; Kugi, Andreas: A design technique for fast sampled-data nonlinear model predictive control with convergence and stability results (2020)
  14. Yazdaniyan, Z.; Shamsi, M.; Foroozandeh, Z.; de Pinho, Maria do Rosário: A numerical method based on the complementarity and optimal control formulations for solving a family of zero-sum pursuit-evasion differential games (2020)
  15. Zanelli, A.; Domahidi, A.; Jerez, J.; Morari, M.: FORCES NLP: an efficient implementation of interior-point methods for multistage nonlinear nonconvex programs (2020)
  16. Zhao, Jisong; Li, Shuang: Adaptive mesh refinement method for solving optimal control problems using interpolation error analysis and improved data compression (2020)
  17. Almeida, Luis; Privat, Yannick; Strugarek, Martin; Vauchelet, Nicolas: Optimal releases for population replacement strategies: application to Wolbachia (2019)
  18. Altherr, Lena C.; Leise, Philipp; Pfetsch, Marc E.; Schmitt, Andreas: Resilient layout, design and operation of energy-efficient water distribution networks for high-rise buildings using MINLP (2019)
  19. Andersson, Joel A. E.; Gillis, Joris; Horn, Greg; Rawlings, James B.; Diehl, Moritz: CasADi: a software framework for nonlinear optimization and optimal control (2019)
  20. Armand, Paul; Tran, Ngoc Nguyen: Rapid infeasibility detection in a mixed logarithmic barrier-augmented Lagrangian method for nonlinear optimization (2019)

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