[vfs] Current status?
Commons VFS seems to be useful to help with a number of aspects I'm looking at, but I'm concered about it's current development state. It seems a little dormant in terms of recent development activity and fixing, and the web pages have a number of broken links. Is this still an active and viable project to consider using? -- Rob Ascert - Taking systems to the edge www.ascert.com - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
Re: [vfs] Current status?
Hello, It hasnt seen much activity but we still are working slowly towards a 2.1 Version. It is a bit unclear how it fits into newer Java offered FileSystem abstractions, but it has still quite a few Providers no other solutions offer. -- http://bernd.eckenfels.net - Ursprüngliche Nachricht - Von: Rob Walker r...@ascert.com Gesendet: 01.08.2014 08:33 An: user@commons.apache.org user@commons.apache.org Betreff: [vfs] Current status? Commons VFS seems to be useful to help with a number of aspects I'm looking at, but I'm concered about it's current development state. It seems a little dormant in terms of recent development activity and fixing, and the web pages have a number of broken links. Is this still an active and viable project to consider using? -- Rob Ascert - Taking systems to the edge www.ascert.com - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
Re: [vfs] Current status?
Ok, cool, thanks for the feedback Bernd - Rob On 01/08/2014 09:03, Bernd Eckenfels wrote: Hello, It hasnt seen much activity but we still are working slowly towards a 2.1 Version. It is a bit unclear how it fits into newer Java offered FileSystem abstractions, but it has still quite a few Providers no other solutions offer. -- Ascert - Taking systems to the edge r...@ascert.com SA +27 21 300 2028 UK +44 20 7488 3470 ext 5119 www.ascert.com - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
[vfs] webdav access throws ClassCastException: ArrayList cannot be cast Node
@Gary: I am using 2.1-SNAPSHOT Rev.:1609711 @Martin: I can understand - to an extent - what you write about the difference between XMLConfiguration and PropertyConfiguration. But can you explain why is this topic special to webdav in general or maybe only in combination with Alfresco? And most importantly, how can I get WebDav to work? From reading on the projects's web-site, I was in the believe that WebDav is a supported filesystem. Am I doing something wrong in my code? Are there any examples I can have a look at?
[vfs] Next newbie Q - local cacheing of remote files (e.g. HTTP)
From what I've read, I think that if I use say HTTP for file access, there's cacheing of files locally in a temp dir to avoid retrieving them on every reference? That's pretty much exactly what I need. Just want to check I'm not misunderstanding this, and if there are any gotchas to be aware of I'd assume that things like Last-Modified would be checked at some period, and new copies pulled down if changed? -- Rob Walker -- Ascert - Taking systems to the edge www.ascert.com - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
Re: [vfs] Next newbie Q - local cacheing of remote files (e.g. HTTP)
There is a caching mechanism, which you can override if you instantiate your own FileSystemManager. AFAIR from reading the code, each provider has some control over deciding which files should be cached. For your initial voyage, the defaults should work fine. -- Schalk W. Cronjé Maintainer of Groovy-VFS [Sent from mobile phone] div Original message /divdivFrom: Rob Walker r...@ascert.com /divdivDate:01/08/2014 12:35 (GMT+02:00) /divdivTo: Commons Users List user@commons.apache.org /divdivSubject: [vfs] Next newbie Q - local cacheing of remote files (e.g. HTTP) /divdiv /divFrom what I've read, I think that if I use say HTTP for file access, there's cacheing of files locally in a temp dir to avoid retrieving them on every reference? That's pretty much exactly what I need. Just want to check I'm not misunderstanding this, and if there are any gotchas to be aware of I'd assume that things like Last-Modified would be checked at some period, and new copies pulled down if changed? -- Rob Walker -- Ascert - Taking systems to the edge www.ascert.com - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
Re: [vfs] Next newbie Q - local cacheing of remote files (e.g. HTTP)
Cool, thanks Schalk, sounds to be what I need - Rob On 01/08/2014 14:28, Schalk W. Cronjé wrote: There is a caching mechanism, which you can override if you instantiate your own FileSystemManager. AFAIR from reading the code, each provider has some control over deciding which files should be cached. For your initial voyage, the defaults should work fine. -- Schalk W. Cronjé Maintainer of Groovy-VFS [Sent from mobile phone] div Original message /divdivFrom: Rob Walker r...@ascert.com /divdivDate:01/08/2014 12:35 (GMT+02:00) /divdivTo: Commons Users List user@commons.apache.org /divdivSubject: [vfs] Next newbie Q - local cacheing of remote files (e.g. HTTP) /divdiv /divFrom what I've read, I think that if I use say HTTP for file access, there's cacheing of files locally in a temp dir to avoid retrieving them on every reference? That's pretty much exactly what I need. Just want to check I'm not misunderstanding this, and if there are any gotchas to be aware of I'd assume that things like Last-Modified would be checked at some period, and new copies pulled down if changed? -- Rob Walker -- Ascert - Taking systems to the edge r...@ascert.com SA +27 21 300 2028 UK +44 20 7488 3470 ext 5119 www.ascert.com - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
[math3.fitting.leastsquares]
Dear mailing list, I would like to do a Levenberg-Marquardt least mean square fit (i. e. min( |f(x)|^2 ) for f: R^d - R^n, d in [2,8], n in [~50, ~1]) using org.apache.commons.math3.fitting.leastsquares.LevenbergMarquardtOptimizer and I am somewhat confused by the relevant API. tl/dr: Is there a way to do this in a simple way, providing only a function f, its derivative function df and an initial guess for x? Long form: it seems that I have to create a LeastSquaresProblem which requires a lot of input * MultivariateVectorFunction model: done * MultivariateMatrixFunction jacobian: done * double[] observed: [0,...,0] in my case, since i want least mean squares, right? * double[] start: done * RealMatrix weight: should this be a new DiagonalMatrix([1,...,1]) of the dimension of observed? * ConvergenceCheckerLeastSquaresProblem.Evaluation checker: no clue * int maxEvaluations: no clue * int maxIterations: no clue Is there a way to get reasonable defaults for the three or four last arguments? Or put differently, what would be typical inputs for the last four arguments? I would be very glad, if you could help me with this problem. I have been trying to figure out, what would be sensible inputs be reading the source code, but I guess it would take ages until I really understood what is going on there. The results of a trial-and-error approach have also been rather disappointing so far. Best regards, Benjamin Eltzner - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
Re: [VFS][WebDAV] access throws ClassCastException: ArrayList cannot be cast Node
Hello Jörg, is this (or a similiar installation) somewhere available over the internet, I would like to debug what types are returned here. (I am not sure I understand what this has to do with XMLConfiguration) I dont think it is a problem of your code, that casting problem should never happen. Feel free to open a Jira Bug for it. https://issues.apache.org/jira/browse/VFS Gruss Bernd Am Fri, 1 Aug 2014 11:26:09 +0200 schrieb Jörg Wille joerg.wi...@gmail.com: @Gary: I am using 2.1-SNAPSHOT Rev.:1609711 @Martin: I can understand - to an extent - what you write about the difference between XMLConfiguration and PropertyConfiguration. But can you explain why is this topic special to webdav in general or maybe only in combination with Alfresco? And most importantly, how can I get WebDav to work? From reading on the projects's web-site, I was in the believe that WebDav is a supported filesystem. Am I doing something wrong in my code? Are there any examples I can have a look at? - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
Re: [math3.fitting.leastsquares]
Hi. On Fri, 01 Aug 2014 18:29:33 +0200, Benjamin Eltzner wrote: Dear mailing list, I would like to do a Levenberg-Marquardt least mean square fit (i. e. min( |f(x)|^2 ) for f: R^d - R^n, d in [2,8], n in [~50, ~1]) using org.apache.commons.math3.fitting.leastsquares.LevenbergMarquardtOptimizer and I am somewhat confused by the relevant API. tl/dr: Is there a way to do this in a simple way, providing only a function f, its derivative function df and an initial guess for x? Long form: it seems that I have to create a LeastSquaresProblem which requires a lot of input * MultivariateVectorFunction model: done * MultivariateMatrixFunction jacobian: done * double[] observed: [0,...,0] in my case, since i want least mean squares, right? Not necessarily. The algorithm will look for the set of parameters x = ( x_1, x_2, ..., x_d ) for which f(x) = c_1, c_2, ..., c_n is closest to the observed values o_1, o_2, ..., o_n. * double[] start: done * RealMatrix weight: should this be a new DiagonalMatrix([1,...,1]) of the dimension of observed? A diagonal matrix of unit weights is the default. * ConvergenceCheckerLeastSquaresProblem.Evaluation checker: no clue It's a user-defined check for convergence. But you can set it to null: the standard Levenberg-Marquardt procedure for checking convergence will then be used. * int maxEvaluations: no clue * int maxIterations: no clue These are intended to avoid running forever: maxEvaluations sets a limit to the number of evaluations of f(x), maxIterations limits the number of iteration of the optimizer's main loop. If you are confident that the problem is well behaved, you can set them to Integer.MAX_VALUE. Is there a way to get reasonable defaults for the three or four last arguments? Or put differently, what would be typical inputs for the last four arguments? I would be very glad, if you could help me with this problem. I have been trying to figure out, what would be sensible inputs be reading the source code, but I guess it would take ages until I really understood what is going on there. The results of a trial-and-error approach have also been rather disappointing so far. The user guide should be updated; sorry for that. Best regards, Gilles - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
