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.