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...ont: sda2: write barrier op failed blkfront: sda2: barriers disabled end_request: I/O error, dev sda2, sector 0 end_request: I/O error, dev sda2, sector 0 Filesystem "sda2": Disabling barriers, trial barrier write failed Has anybody an idea how to resolve this? Thanks a lot Alexander Maringer _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users

Dear all, version 2.10-0 of package NMOF is on CRAN now. NMOF stands for 'Numerical Methods and Optimization in Finance', and it accompanies the book with the same name, written by Manfred Gilli, Dietmar Maringer and Enrico Schumann.[1] Since the last announcement on this list in 2021, several functions have been added to the package, such as 'barrierOptionEuropean' for valuing barrier options, and function 'minMAD' for computing minimum-MAD portfolios. Also, existing functionality has bee...

Dear all, version 2.10-0 of package NMOF is on CRAN now. NMOF stands for 'Numerical Methods and Optimization in Finance', and it accompanies the book with the same name, written by Manfred Gilli, Dietmar Maringer and Enrico Schumann.[1] Since the last announcement on this list in 2021, several functions have been added to the package, such as 'barrierOptionEuropean' for valuing barrier options, and function 'minMAD' for computing minimum-MAD portfolios. Also, existing functionality has bee...

Dear all, version 0.20-0 of package NMOF is now on CRAN. 'NMOF' stands for 'Numerical Methods and Optimization in Finance'. The package accompanies the book with the same name, written by Manfred Gilli, Dietmar Maringer and Enrico Schumann, published by Elsevier/Academic Press in 2011. The package contains, in particular, several implementations of optimization heuristics, such as Differential Evolution, Genetic Algorithms and Threshold Accepting. The package comes with several vignettes, for example on yield...

Dear all, version 0.20-0 of package NMOF is now on CRAN. 'NMOF' stands for 'Numerical Methods and Optimization in Finance'. The package accompanies the book with the same name, written by Manfred Gilli, Dietmar Maringer and Enrico Schumann, published by Elsevier/Academic Press in 2011. The package contains, in particular, several implementations of optimization heuristics, such as Differential Evolution, Genetic Algorithms and Threshold Accepting. The package comes with several vignettes, for example on yield...

Dear all, version 1.2-2 of package NMOF is on CRAN now. NMOF stands for 'Numerical Methods and Optimization in Finance'. The package provides R code and datasets for the book with the same name, written by Manfred Gilli, Dietmar Maringer and Enrico Schumann, published by Elsevier/Academic Press in 2011. The package has finally crossed the 1.0 line: It is 10 years since the development of NMOF began, and many of the functions -- notably those for optimization -- have been in continuous use since then. That implies a certain maturit...

Good day, Here I was trying to write a code for Garch(1,1) . As garch problem is more or less an optimization problem I also tried to get the algorithm for "nlminb" function. What I saw that if use this function 'nlminb" I can easyly get the estimate of parameters. But any other function is not working. I tried to write my own code for optimization using Quasi-Newton