Re: [VFS] canCreateFileSystem("directory.jar/")

2013-08-16 Thread Bernd Eckenfels
Hello, I have filed this Bug report and also provided a fixed version (on Github): https://issues.apache.org/jira/browse/VFS-490 https://github.com/ecki/seeburger-vfs2/blob/master/vfs2provider-jdbctable/src/main/java/com/seeburger/vfs2/util/VFSClassLoader.java#L152 Greetings Bernd Am 16.08.201

[VFS] canCreateFileSystem("directory.jar/")

2013-08-16 Thread Bernd Eckenfels
Hello, I want to use the VFSClassLoader on JAR files and Directories (to provide resources). My problem is, that some directories are exploded archives and have a name with a .jar extension. The addFileObjects() of the VFSClassLoader uses canCreateFileSystem() to detect, if for a given fi

Re: [math] Using the hessian in scalar unconstrained optimization

2013-08-16 Thread Ajo Fod
If you're talking about analysis.differentiation package. I'm looking forward to using it. Though, my main point in this thread was that if one can compute the hessian, it should be possible in certain cases to speed up convergence rather than depending on an update rule to estimate an *approximat

Re: [math] Using the hessian in scalar unconstrained optimization

2013-08-16 Thread Luc Maisonobe
Le 16/08/2013 18:55, Ajo Fod a écrit : > The algorithm computes the Hessian using an update rule. My question was > what if you can compute the hessian analytically? > > Hessian: http://en.wikipedia.org/wiki/Hessian_matrix > Gradient: http://en.wikipedia.org/wiki/Gradient We do have support to he

Re: [math] Using the hessian in scalar unconstrained optimization

2013-08-16 Thread Ajo Fod
The algorithm computes the Hessian using an update rule. My question was what if you can compute the hessian analytically? Hessian: http://en.wikipedia.org/wiki/Hessian_matrix Gradient: http://en.wikipedia.org/wiki/Gradient Cheers, -Ajo On Fri, Aug 16, 2013 at 9:39 AM, Luc Maisonobe wrote: > L

Re: [math] Using the hessian in scalar unconstrained optimization

2013-08-16 Thread Luc Maisonobe
Le 15/08/2013 22:59, Ajo Fod a écrit : > Hello, > > Is'nt there an advantage to being able to compute the Jacobian of the > gradient precisely at a point? > > If so, is there a class that uses the Jacobian instead of estimating the > jacobian from the last few iteration as NonLinearConjugateGradi