Subject: NA Digest, V. 15, # 28 NA Digest Thursday, July 16, 2015 Volume 15 : Issue 28 Today's Editor: Daniel M. Dunlavy Sandia National Labs [log in to unmask] Today's Topics: MJD Powell's offprints MATLAB inv() much less stable in new releases than old MATH77/mathc90 Libraries Available at netlib New Book, Spline Functions: Computational Methods GAMM Uncertainty Quantification, Germany, Sep 2015 Pacific Northwest NA Seminar, USA, Oct 2015 Programmer/Research Associate Position, NC State Professorship Position, Stochastics, Univ of Innsbruck, Austria Postdoc Positions, Global Climate Modeling, PNNL Postdoc Positions, Large Scale Linear Algebra, Manchester England PhD/Postdoc Position, Univ Münster, Germany PhD Position, Mathematical Geosciences, Univ of Vienna PhD Position, Univ of Giessen, Germany Subscribe, unsubscribe, change address, or for na-digest archives: http://www.netlib.org/na-digest-html/faq.html Submissions for NA Digest: http://icl.cs.utk.edu/na-digest/ ------------------------------------------------------- From: Arieh Iserles [log in to unmask] Date: July 16, 2015 Subject: MJD Powell's offprints Clearing the office of Mike Powell, who sadly passed away in April, we came across a treasure throve of his preprints and offprints, some going back to the dawn of modern optimization. While some have been digitised and are available elsewhere, others are not. Mike Powell's guiding principle was to share his research with others and we intend to continue in this spirit. The list of all these offprints resides at http://www.damtp.cam.ac.uk/user/na/MJDP_Offprints.html . If you are interested in any of them, please email Virginia Mullins ([log in to unmask]): they will be distributed on a first-come, first-served basis. ------------------------------------------------------- From: Mike Sussman [log in to unmask] Date: July 09, 2015 Subject: MATLAB inv() much less stable in new releases than old Does anyone know why the folks at the Mathworks have chosen to change the matrix algorithm for the inv function so that it is much less stable than before? Between MATLAB releases R2012a and R2014a the following sequence of instructions produces drastically different results: A=hilb(10); Ainv=inv(A); x=ones(10,1); b=A*x; norm(x-Ainv*b)/norm(x) Using release R2012a, this produces 2.9743e-4, somewhat better than would be expected from the condition number of 1.6025e+13. If, instead, Ainv is computed as Ainv=A\eye(10), the result is 0.0051, larger than with inv(A) but still consistent with the condition number. In contrast, using release R2014a (and more recent versions) one gets 1.4290e+5, substantially larger than one would expect from the condition number. If I recall correctly, this change occurred in or before R2013a, but I can no longer verify that. In any case I have been unable to find any mention of a change in the release notes or on the internet. Can anyone help me understand why such a change was made? Is the new algorithm better in some way for some class of problem? ------------------------------------------------------- From: Fred Krogh [log in to unmask] Date: July 14, 2015 Subject: MATH77/mathc90 Libraries Available at netlib Caltech has agreed to make the mathematical software libraries developed at the Jet Propulsion Laboratory open source. This resource can be found at http://netlib.org/math/. The README file there gives further information. ------------------------------------------------------- From: Bruce Bailey [log in to unmask] Date: July 10, 2015 Subject: New Book, Spline Functions: Computational Methods Spline Functions: Computational Methods, by Larry L. Schumaker xii + 413 pages / Hardcover / ISBN 978-1-611973-89-1 / List Price $83.00 / SIAM Member Price $58.10 / Order Code OT142 This book describes in detail the key algorithms needed for computing with spline functions and illustrates their use in solving several basic problems in numerical analysis, including function approximation, numerical quadrature, data fitting, and the numerical solution of PDEs. The focus is on computational methods for bivariate splines on triangulations in the plane and on the sphere, although both univariate and tensor-product splines are also discussed. The book contains numerous examples and figures to illustrate the methods and their performance. All of the algorithms in the book have been coded in a separate MATLAB package available for license. The package can be used to run all of the examples in the book and also provides readers with the essential tools needed to create software for their own applications. In addition to the included bibliography, a list of over 100 pages of additional references can be found on the book’s website. To order or for more about this book, including links to its Preface, Contents, and Index, please visit http://bookstore.siam.org/OT142. ------------------------------------------------------- From: Oliver Ernst [log in to unmask] Date: July 16, 2015 Subject: GAMM Uncertainty Quantification, Germany, Sep 2015 I am pleased to announce that the 2nd Workshop of the GAMM Activity Group on Uncertainty Quantification will take place at the TU Chemnitz on September 10-11th, 2015. Confirmed invited speakers are - Aretha Teckentrup (U Warwick) - Claudia Schillings (U Warwick) - Elisabeth Ullmann (U Hamburg) - Martin Eigel (WIAS Berlin) - Hanno Gottschalk (U Wuppertal) Details and online registration can be found at https://www.tu- chemnitz.de/mathematik/numa/gamm-aguq2015 ------------------------------------------------------- From: Tilmann Glimm [log in to unmask] Date: July 13, 2015 Subject: Pacific Northwest NA Seminar, USA, Oct 2015 The 28th Annual Pacific Northwest Numerical Analysis Seminar (PNWNAS) will be held at Western Washington University in Bellingham, Washington on Saturday, October 17, 2015. There will be 8 invited speakers (names TBA). A broad range of interdisciplinary research topics will be covered, including mathematical modeling and numerical simulation of large-scale complex systems in applied fields, such as biology, chemical engineering, fluid mechanics, medical science and materials science, numerical linear algebra, multi-scale modeling and simulation, stochastic processes, inverse problems and image processing. Poster sessions will provide early-stage researchers with an opportunity to showcase their work. For early registration and more information see https://sites.google.com/site/pnwnas2015/ or contact [log in to unmask] or [log in to unmask] . ------------------------------------------------------- From: Yi-Hui Zhou [log in to unmask] Date: July 14, 2015 Subject: Programmer/Research Associate Position, NC State The Bioinformatics Research Center (BRC) at North Carolina State University is an interdisciplinary research center that includes over a dozen faculty from Statistics, Biological Sciences, Computer Science, and other departments. The Center also houses approximately 25 students in the Bioinformatics Graduate Program. Position Title: Programmer/Research Associate Duties and Responsibilities: This Programmer/Research Associate will serve in a programmer role for Dr. Yi-Hui Zhou in a dynamic group conducting genomic data analysis in the Bioinformatics Research Center. This position will be responsible for, but not limited to: Creating statistical packages in the R environment Creating websites and interfaces using JAVA Achieving a high level of scientific skill in the areas of bioinformatics and genomics annotation. This individual will develop and implement software development and annotation for collaborative genetics research projects. Serving as an expert in practical aspects of genomic annotation and software development for genetic data analysis. This individual will be responsible for researching the analysis and annotation needs of the research group and suggesting and implementing an analysis pipeline to meet those needs. Position Qualifications: Proficiency in R and JAVA Advanced degree in Computer Science or related discipline Background in Mathematics (or related quantitative science) Application Information: Please send CV and names of three references to [log in to unmask] ------------------------------------------------------- From: Mechthild Thalhammer [log in to unmask] Date: July 15, 2015 Subject: Professorship Position, Stochastics, Univ of Innsbruck, Austria The University of Innsbruck, Austria, invites applications for the position of a Professor of Stochastics (40 hours per week; permanent civil-law employment contract; application till August 26, 2015). For detailed information, please follow the link http://www.uibk.ac.at/fakultaeten- servicestelle/standorte/technikerstrasse/berufung/ausschreibungstexte/aus schreibung_stochastik_e.pdf ------------------------------------------------------- From: Hui Wan [log in to unmask] Date: July 10, 2015 Subject: Postdoc Positions, Global Climate Modeling, PNNL Pacific Northwest National Laboratory (PNNL), Richland, WA, USA Job Announcement (ID: 304443) Job Description PNNL is recruiting *up to three postdoctoral research associates* to work on projects related to high-resolution global Climate and Earth System models. We are particularly interested in features pertaining to the Earth's water cycle, aerosol-cloud-climate interactions, and interactions between Earth's atmosphere and surface components, that are often influenced by natural and anthropogenic gaseous and aerosol emissions. We are interested in answering hypothesis-driven physical questions, but also in the computational challenges of modeling these processes accurately on current and upcoming computer systems. For further details and online application, please visit http://pnnl.jobs/richland-wa/post-doctorate-ra-atmospheric-climate- modeling/EEB5B521CCC04034AEEA3D6C703E82CB/job/ ------------------------------------------------------- From: Jack Dongarra [log in to unmask] Date: July 15, 2015 Subject: Postdoc Positions, Large Scale Linear Algebra, Manchester England We are inviting applications for three postdoctoral positions that are open in the Numerical Linear Algebra Group at the University of Manchester in England. The successful candidates will join Numerical Linear Algebra for Future and Emerging Technologies (NLAFET) collaboration, a project funded by the European Commission and involving University of Manchester, INRIA, Umea University, and STFC/RAL. They will conduct research on dense and sparse linear algebra solvers aiming at a significant reduction of communication and thus suitable for future and emerging large-scale computers. The algorithms developed will be validated on several applications targeted by NLAFET, such as computational fluid dynamics, astrophysics, etc. A close collaboration and visits with the other partners of the project will be involved. The positions will focus on design, implementation, and evaluation of parallel algorithms for numerical linear algebra with regards to the extreme-scale challenges. The research will be done in close collaboration with recognized researchers and PhD students in the research group as well as with other partners in NLAFET. This post offers a full-time 36-month research appointment. Informal enquiries may be made to: Professor Jack Dongarra. Email: [log in to unmask] ------------------------------------------------------- From: Patrick Henning [log in to unmask] Date: July 14, 2015 Subject: PhD/Postdoc Position, Univ Münster, Germany At the Institute for Computational und Applied Mathematics of the University of Münster (Germany) we are currently offering a 3-year PhD position. The position is associated with a project of the German Research Foundation (DFG) and focuses on finite element based approaches for nonlinear Schrödinger equations for simulating Bose-Einstein condensates. The salary is based on the German public service salary scale (TV-L). For additional information we refer to the following link http://www.uni-muenster.de/Rektorat/Stellen/ausschreibungen/st_20151307_sk12.html and for further questions, please contact Dr. Patrick Henning ([log in to unmask]). If you are interested in this position, please send your application and CV until the 31h of July electronically to Carolin Gietz ([log in to unmask]). ------------------------------------------------------- From: Christian Gerhards [log in to unmask] Date: July 13, 2015 Subject: PhD Position, Mathematical Geosciences, Univ of Vienna Currently, there is an open 3-year position for a PhD student at the Computational Science Center (headed by Otmar Scherzer) at the University of Vienna. The position is associated with the DFG-funded project Time-Space Multiscale Separation of Ocean Tide Generated Magnetic Signals which is part of the DFG Research Priority Program "Study of Earth system dynamics with a constellation of potential field missions (DynamicEarth)". The project aims at developing mathematical tools (e.g., the construction of localized basis functions for the induction equation) to separate the contribution of the Earth's magnetic field that is due to induction effects by (tidal) ocean currents. It takes place in collaboration with the GFZ German Research Center for Geosciences in Potsdam. Candidates must have a MSc degree (or equivalent) in Mathematics, Computer Science, or a closely related field and have a strong interest in interdisciplinary mathematics and geosciences. They are open minded, active, and have a good command of the English and/or German language. Interested candidates should send their application to [log in to unmask] by August 31, 2015. More details on the position, the project, and the Computational Science Center can be found on http://www.csc.univie.ac.at/index.php?page=ocean tides . ------------------------------------------------------- From: Oleg Davydov [log in to unmask] Date: July 13, 2015 Subject: PhD Position, Univ of Giessen, Germany Applications are invited for a PhD position in the Numerical Analysis group of the University of Giessen. Current research interests of the group are in the areas of approximation theory, radial basis functions, meshless methods and the finite element method, including both mathematical theory and numerical experimentation. The position is for 3 years with possible extension for 2 more years. The duties include teaching 2 hours of tutorials per week in German language. The salary is based on the German public service salary scale (TV-H). The starting date is October 1, 2015. The deadline for applications is July 31, 2015. The official announcement with full details of the position and application instructions can be found at http://www.inst.uni-giessen.de/stellenmarkt/pdf/stelle0008176.pdf If you want to discuss your application informally, please contact Prof. Dr. Martin Buhmann Tel: +49-(0)641-99-32190 Email: [log in to unmask] or Prof. Oleg Davydov Tel: +49-(0)641-99-32192 Email: [log in to unmask] ------------------------------------------------------- End of Digest **************************