>To my knowledge, the only data type capable of storing graph objects >(and >any R object) is list, but unfortunately it is available in only one >dimension. Could the graphs be stored in any two-dimensional data type?
Lists can have any number of dimensions you want, just as with other vector types. The default printout of such a thing is not very pretty, but the information is in the object. > M <- matrix(list(as.roman(99), "Two", c(3,pi) , c(4,44,444)), nrow=2, ncol=2) > M [,1] [,2] [1,] 99 Numeric,2 [2,] "Two" Numeric,3 > M[[1,1]] [1] XCIX > M[[1,2]] [1] 3.000000 3.141593 Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On > Behalf > Of Jeff Newmiller > Sent: Thursday, May 23, 2013 9:06 AM > To: jpm miao; r-help > Subject: Re: [R] Could graph objects be stored in a "two-dimensional list"? > > You could use lists of lists, and index them with vectors. > > a <- list() > a[[1]] <- list() > a[[2]] <- list() > a[[c(1,1)]] <- g11 > a[[c(1,2)]] <- g12 > a[[c(2,1)]] <- g21 > a[[c(2,2)]] <- g22 > print(a[[c(2,1)]]) > > but this seems like an inefficient use of memory because your indexed data is > stored > more compactly than the graph object is. I would index the data and generate > the graph > object on the fly when I wanted to see it. > --------------------------------------------------------------------------- > Jeff Newmiller The ..... ..... Go Live... > DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go... > Live: OO#.. Dead: OO#.. Playing > Research Engineer (Solar/Batteries O.O#. #.O#. with > /Software/Embedded Controllers) .OO#. .OO#. rocks...1k > --------------------------------------------------------------------------- > Sent from my phone. Please excuse my brevity. > > jpm miao <miao...@gmail.com> wrote: > > >Hi, > > > >I have a few graph objects created by some graphic package (say, > >ggplot2, > >which I use frequently). Because of the existent relation between the > >graphs, I'd like to index them in two dimensions as p[1,1], p[1,2], > >p[2,1], > >p[2,2] for convenience. > > > >To my knowledge, the only data type capable of storing graph objects > >(and > >any R object) is list, but unfortunately it is available in only one > >dimension. Could the graphs be stored in any two-dimensional data type? > > > > One remedy that comes to my mind is to build a function f so that > >f(1,1)=1 > >f(1,2)=2 > >f(2,1)=3 > >f(2,2)=4 > >With functions f and f^{-1} (inverse function of f) , the > >two-dimensional > >indices could be mapped to and from a set of one-dimensional indices, > >and > >the functions are exactly the way R numbers elements in a matrix. Does > >R > >have this built-in function for a m by n matrix or more generally, > >m*n*p > >array? (I know this function is easy to write, but just want to make > >sure > >whether it exists already) > > > > Thanks, > > > >Miao > > > > [[alternative HTML version deleted]] > > > >______________________________________________ > >R-help@r-project.org 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@r-project.org 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@r-project.org 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.