[R] Matrixes as data
bolker at ufl.edu
Fri Oct 16 23:18:19 CEST 2009
Magnus Torfason-2 wrote:
> > Hola!
> > I am working on a problem where data points are (square) matrices. Is
> > there a way to make a "vector" of matrices, such that it can be stored
> > in a data.frame?
> I agree with previous posters that in most cases, you would want to
> store matrices in a list. However, if you already have a bunch of data
> in a data.frame, and really want your matrices to hang around with that
> data (for example for persistent storage purposes), you could use the
> serialize() function to convert them into a string. I have the following
> functions ("object to character" and "character to object"), that I have
> used for that exactly:
> # This function stores an R object as a character string.
> # Useful for storing in places that don't accept an R list
> # or other objects.
> otc <- function(o)
> return(rawToChar(serialize(o, NULL, ascii=TRUE)))
> # This function accepts an object that has been serialized as
> # a character string and returns the original object.
> cto <- function(c)
> # Demo code
> x <- matrix(1:4,nrow=2)
> s <- otc(x)
> d <- data.frame(a=c,stringsAsFactors=FALSE)
The alternative, if you're going to be working with these kinds of data *a
is to create a class for the matrices+auxiliary data object (for S3, you can
store this as a list of (list of matrices, data frames); for S4, store the
of matrices and the data frame as separate slots in the object). Then write
accessor functions that make sense.
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