Re: [R] dumping/loading objects with 'tsp' attribute
On Thu, 23 Nov 2006, Antonio, Fabio Di Narzo wrote: Dear all, I'm indirectly faced with the fact that setting the 'tsp' attribute of an object modifies its class definition: class( structure(1:2, tsp=c(1,2,1), class=c(myts,ts)) ) [1] ts myts In general, this is of really little (ok, I admit: totally no) interest for me because 'myts' class is added just after assigning the 'tsp' attribute (by calling ts). However, this behaviour gives me troubles when re-loading a previously deparsed object, so that: x - ts(1:2) class(x) - c(myts, class(x)) dput( x , temp.dat) class(dget(temp.dat)) [1] ts myts unlink(temp.dat) In other words, my real problem should be restated as: how to safely dump (and then load) an object which has a (perhaps valid) tsp attribute? More generally: can someone suggest me a safer way to dump/restoring R objects? save/load. ?dput comes with copious warnings about the problems of doing what you are attempting, so I wonder why you are surprised. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UKFax: +44 1865 272595 __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] dumping/loading objects with 'tsp' attribute
2006/11/23, Prof Brian Ripley [EMAIL PROTECTED]: On Thu, 23 Nov 2006, Antonio, Fabio Di Narzo wrote: Dear all, I'm indirectly faced with the fact that setting the 'tsp' attribute of an object modifies its class definition: class( structure(1:2, tsp=c(1,2,1), class=c(myts,ts)) ) [1] ts myts In general, this is of really little (ok, I admit: totally no) interest for me because 'myts' class is added just after assigning the 'tsp' attribute (by calling ts). However, this behaviour gives me troubles when re-loading a previously deparsed object, so that: x - ts(1:2) class(x) - c(myts, class(x)) dput( x , temp.dat) class(dget(temp.dat)) [1] ts myts unlink(temp.dat) In other words, my real problem should be restated as: how to safely dump (and then load) an object which has a (perhaps valid) tsp attribute? More generally: can someone suggest me a safer way to dump/restoring R objects? save/load. Ok. That seems to be the final statement: to be sure about the result, I have to use binary files for storing R objects (even pure data objects with attached attributes) instead of dumped R code. I will accept that (infact, as I can read in 'save' help page, those binaries should be portable across R platforms) and avoid boring you anymore :-) ?dput comes with copious warnings about the problems of doing what you are attempting, so I wonder why you are surprised. I've seen. That's because I've asked for suggestions, and not called this a 'bug' or a 'nonsense' behaviour. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UKFax: +44 1865 272595 -- Antonio, Fabio Di Narzo Ph.D. student at Department of Statistical Sciences University of Bologna, Italy __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] dumping/loading objects with 'tsp' attribute
On 11/23/06, Antonio, Fabio Di Narzo [EMAIL PROTECTED] wrote: 2006/11/23, Prof Brian Ripley [EMAIL PROTECTED]: On Thu, 23 Nov 2006, Antonio, Fabio Di Narzo wrote: Dear all, I'm indirectly faced with the fact that setting the 'tsp' attribute of an object modifies its class definition: class( structure(1:2, tsp=c(1,2,1), class=c(myts,ts)) ) [1] ts myts In general, this is of really little (ok, I admit: totally no) interest for me because 'myts' class is added just after assigning the 'tsp' attribute (by calling ts). However, this behaviour gives me troubles when re-loading a previously deparsed object, so that: x - ts(1:2) class(x) - c(myts, class(x)) dput( x , temp.dat) class(dget(temp.dat)) [1] ts myts unlink(temp.dat) In other words, my real problem should be restated as: how to safely dump (and then load) an object which has a (perhaps valid) tsp attribute? More generally: can someone suggest me a safer way to dump/restoring R objects? save/load. Ok. That seems to be the final statement: to be sure about the result, I have to use binary files for storing R objects (even pure data objects with attached attributes) instead of dumped R code. If its mainly ascii you are after but the source file part is not important then note that save can save to ascii files: y - x save(x, file = temp.rda, ascii = TRUE) rm(x) load(temp.rda) identical(x, y) readLines(temp.rda) unlink(temp.rda) I will accept that (infact, as I can read in 'save' help page, those binaries should be portable across R platforms) and avoid boring you anymore :-) ?dput comes with copious warnings about the problems of doing what you are attempting, so I wonder why you are surprised. I've seen. That's because I've asked for suggestions, and not called this a 'bug' or a 'nonsense' behaviour. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UKFax: +44 1865 272595 -- Antonio, Fabio Di Narzo Ph.D. student at Department of Statistical Sciences University of Bologna, Italy __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] dumping/loading objects with 'tsp' attribute
On 11/23/06, Gabor Grothendieck [EMAIL PROTECTED] wrote: On 11/23/06, Antonio, Fabio Di Narzo [EMAIL PROTECTED] wrote: 2006/11/23, Prof Brian Ripley [EMAIL PROTECTED]: On Thu, 23 Nov 2006, Antonio, Fabio Di Narzo wrote: Dear all, I'm indirectly faced with the fact that setting the 'tsp' attribute of an object modifies its class definition: class( structure(1:2, tsp=c(1,2,1), class=c(myts,ts)) ) [1] ts myts In general, this is of really little (ok, I admit: totally no) interest for me because 'myts' class is added just after assigning the 'tsp' attribute (by calling ts). However, this behaviour gives me troubles when re-loading a previously deparsed object, so that: x - ts(1:2) class(x) - c(myts, class(x)) dput( x , temp.dat) class(dget(temp.dat)) [1] ts myts unlink(temp.dat) In other words, my real problem should be restated as: how to safely dump (and then load) an object which has a (perhaps valid) tsp attribute? More generally: can someone suggest me a safer way to dump/restoring R objects? save/load. Ok. That seems to be the final statement: to be sure about the result, I have to use binary files for storing R objects (even pure data objects with attached attributes) instead of dumped R code. If its mainly ascii you are after but the source file part is not important then note that save can save to ascii files: y - x save(x, file = temp.rda, ascii = TRUE) rm(x) load(temp.rda) identical(x, y) readLines(temp.rda) unlink(temp.rda) and here is a workaround if you are willing to do a bit of work when outputting the objects: # test data x - ts(1:2) class(x) - c(myts, ts) y - x # need 3 output statements dump(x, temp.R) write(attributes(x) -, temp.R, append = TRUE) write(deparse(attributes(x)), temp.R, append = TRUE) # source it back in and check rm(x) source(temp.R) identical(x,y) readLines(temp.R) # clean up unlink(temp.R) __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] dumping/loading objects with 'tsp' attribute
2006/11/23, Gabor Grothendieck [EMAIL PROTECTED]: On 11/23/06, Gabor Grothendieck [EMAIL PROTECTED] wrote: On 11/23/06, Antonio, Fabio Di Narzo [EMAIL PROTECTED] wrote: 2006/11/23, Prof Brian Ripley [EMAIL PROTECTED]: On Thu, 23 Nov 2006, Antonio, Fabio Di Narzo wrote: Dear all, I'm indirectly faced with the fact that setting the 'tsp' attribute of an object modifies its class definition: class( structure(1:2, tsp=c(1,2,1), class=c(myts,ts)) ) [1] ts myts In general, this is of really little (ok, I admit: totally no) interest for me because 'myts' class is added just after assigning the 'tsp' attribute (by calling ts). However, this behaviour gives me troubles when re-loading a previously deparsed object, so that: x - ts(1:2) class(x) - c(myts, class(x)) dput( x , temp.dat) class(dget(temp.dat)) [1] ts myts unlink(temp.dat) In other words, my real problem should be restated as: how to safely dump (and then load) an object which has a (perhaps valid) tsp attribute? More generally: can someone suggest me a safer way to dump/restoring R objects? save/load. Ok. That seems to be the final statement: to be sure about the result, I have to use binary files for storing R objects (even pure data objects with attached attributes) instead of dumped R code. If its mainly ascii you are after but the source file part is not important then note that save can save to ascii files: y - x save(x, file = temp.rda, ascii = TRUE) rm(x) load(temp.rda) identical(x, y) readLines(temp.rda) unlink(temp.rda) and here is a workaround if you are willing to do a bit of work when outputting the objects: # test data x - ts(1:2) class(x) - c(myts, ts) y - x # need 3 output statements dump(x, temp.R) write(attributes(x) -, temp.R, append = TRUE) write(deparse(attributes(x)), temp.R, append = TRUE) # source it back in and check rm(x) source(temp.R) identical(x,y) readLines(temp.R) # clean up unlink(temp.R) Many thanks! This works as I want, and can be eventually encapsulated in a sort of safedump function for convenience. More generally, interesting to learn that using attributes- has no side effects (i.e., attributes aren't set by using accessor functions, isn't it?), as opposed to using 'structure' named arguments, so can be more convenient in building R objects with arbitrary attributes (at useR risk...). -- Antonio, Fabio Di Narzo Ph.D. student at Department of Statistical Sciences University of Bologna, Italy __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
