Documents et rapports
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Ghana's cocoa pricing policy (anglais)
Ghana's cocoa production has declined in the past 25 years from half the world market share to about one tenth of the market. This has been partly due to policies that overvalued the domestic currency...
Type de document: Document de travail de recherche sur les politiques Numéro du rapport: WPS429 Date du document: 30 juin 1990 Auteur: Bateman, Merrill J.,Meeraus, Alexander,Newbery,
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CONOPT : an optimization system for nonlinear dynamic planning models (anglais)
This paper describes the CONOPT system. An earlier version of the system was presented in 1977, since then the optimization algorithm has only been changed slightly, the data structure has been changed...
Type de document: Document de travail (série numérotée) Numéro du rapport: DRC17 Date du document: 31 mai 1980 Mode de publication: Disclosed Auteur: Drud, Arne,Meeraus, Alexander
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The planning of investment programs in the fertilizer industry (anglais)
Most projections of fertilizer use around the world imply continuing rapid growth in fertilizer demand. To meet such increased levels of demand, substantial investments are being made in new production...
Type de document: Publication Numéro du rapport: 13360 Date du document: 1 janvier 1980 Auteur: Choksi, Armeane M.,Meeraus, Alexander,Stoutjesdi
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Structure analysis and partial reinversion of large Jacobian matrices in nonlinear programming (anglais)
This paper concerns itself with efficient inversion and updating procedures for large, structurally equivalent Jacobian matrices as they occur in the generalized reduced gradient method for nonlinear programming...
Type de document: Document de travail (série numérotée) Numéro du rapport: DRC12 Date du document: 31 août 1979 Mode de publication: Disclosed Auteur: Bisschop, Johannes,Meeraus, Alexander
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Selected aspects of a general algebraic modeling language (anglais)
This paper touches on the role of models in a policy/planning environment, and establishes the need for a general algebraic modeling system. The main purpose of the paper, however, is to develop a notation...
Type de document: Document de travail (série numérotée) Numéro du rapport: DRC13 Date du document: 31 août 1979 Mode de publication: Disclosed Auteur: Bisschop, Johannes,Meeraus, Alexander
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Complementarity problems and their representation in GAMS (anglais)
This note uses existing knowledge in classifying complementarity problems. It then develops a compact GAMS notation for models with complementarity conditions, and shows how the information contained in...
Type de document: Document de travail (série numérotée) Numéro du rapport: DRC11 Date du document: 31 juillet 1979 Mode de publication: Disclosed Auteur: Bisschop, Johannes,Meeraus, Alexander
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Time - space tradeoff in the implementation of the Hellerman-Rarick algorithm (anglais)
The Hellerman-Rarick (HR) algorithm is a heuristic routine that assigns pivot elements and spikes so as to minimize the number of columns with nonzeros above the diagonal. A detailed description of the...
Type de document: Document de travail (série numérotée) Numéro du rapport: DRC10 Date du document: 31 mars 1979 Mode de publication: Disclosed Auteur: Levy, Yonatan,Meeraus, Alexander
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RANMAT - A random matrix generator with structure control (anglais)
This report offers a random matrix generator which is aimed particularly at sparse matrix generation.
Type de document: Document de travail (série numérotée) Numéro du rapport: DRC9 Date du document: 30 novembre 1978 Mode de publication: Disclosed Auteur: Levy, Yonatan,Meeraus, Alexander
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Domain analysis and exact point-derivative generation for large nonlinear programming systems (anglais)
The role of domain analysis and the automatic generation of exact point-derivatives in the solution of large nonlinear systems of algebraic equations is examined. The paper provides an informal technical...
Type de document: Document de travail (série numérotée) Numéro du rapport: DRC7 Date du document: 31 juillet 1978 Mode de publication: Disclosed Auteur: Bisschop, Johannes,Meeraus, Alexander
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Matrix augmentation and structure preservation in linearly constrained control problems (anglais)
Matrix augmentation is used for the inversion of bases associated with linearly constrained control problems. It is shown how an efficient data structure can be maintained by keeping all state variables...
Type de document: Document de travail (série numérotée) Numéro du rapport: DRC5 Date du document: 31 janvier 1978 Mode de publication: Disclosed Auteur: Meeraus, Alexander,Bisschop, Johannes
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Matrix modifications and the solution of large linear discrete-time control problems with time-integral constraints and upper bounds (anglais)
This technical note studies the discrete-time optimal control problem with linear dynamics and linear objective function allowing for simple upper bounds and time-integral constraints.
Type de document: Document de travail (série numérotée) Numéro du rapport: DRC18 Date du document: 31 octobre 1976 Mode de publication: Disclosed Auteur: Bisschop, Johannes J.,Meeraus, Alexander
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Efficient updating of the basis inverse in linear programming via partitioning (anglais)
A compact and flexible updating procedure using matrix augmentation is developed. It is shown that the representation of the updated inverse does not grow monotonically in size, and may actually decrease...
Type de document: Document de travail (série numérotée) Numéro du rapport: DRC2 Date du document: 31 juillet 1976 Mode de publication: Disclosed Auteur: Bisschop, Johannes,Meeraus, Alexander
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Reduced Jacobians and the solution of large nonlinear simultaneous equations (anglais)
The Hellerman-Rarick preassigned pivot procedure and a partitioning algorithm are used to construct reduced Jacobian matrices for the solution of large sparse nonlinear systems of equations.
Type de document: Document de travail (série numérotée) Numéro du rapport: DRC4 Date du document: 31 juillet 1976 Mode de publication: Disclosed Auteur: Bisschop, Johannes,Meeraus, Alexander
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Partitioning, generalized upper bounding, and angular structures in linear programming (anglais)
In problems with an angular structure, the initial basis is represented in reduced form via partitioning. If partitioning is also used in the updating of the basis, subsequent iterations do not differ...
Type de document: Document de travail (série numérotée) Numéro du rapport: DRC3 Date du document: 31 juillet 1976 Mode de publication: Disclosed Auteur: Bisscop, Johannes,Meeraus, Alexander
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A recursive form in the inverse of general sparse matrices (anglais)
The Helierman-Rarick preassigned pivot procedure and recursive partitioning algorithm are used to find a stable and compact representation of the inverse of a general sparse matrix.
Type de document: Document de travail (série numérotée) Numéro du rapport: DRC1 Date du document: 31 juillet 1976 Mode de publication: Disclosed Auteur: Bisschop, Johannes,Meeraus, Alexander