[R] strings

Martin Maechler maechler at stat.math.ethz.ch
Wed Oct 4 08:42:14 CEST 2000

>>>>> "KH" == Kurt Hornik <Kurt.Hornik at ci.tuwien.ac.at> writes:

>>>>> Richard Rowe writes:
    >> I am attempting to analyse some behaviour sequence data.  The input is
    >> an alphabetic string "ASDFGH ... ".  I wish to start at one end of the
    >> string, peel off each character, and convert to an integer to develop
    >> transition matrices etc. My blundering through the ref manual hasn't
    >> produced any light.

    >> Can this be done easily in R or should I pre-process?

    >> I recollect an item similar to this on R-help around 6 mo ago but I
    >> can't find it in the archive. If there is such an article can someone
    >> please send me the date and I will track it down,

    KH> Richard,

    KH> Not sure what precisely you need ... if it is about converting a string
    KH> to a vector of characters, you could use

    R> x <- "ASDFGH"
    R> x
    KH> [1] "ASDFGH"
    R> unlist(strsplit(x, NULL))
    KH> [1] "A" "S" "D" "F" "G" "H"

    KH> and proceed from there.

which reminds me that I've had a desire for something like
the old S function  [from the blue book, and library(examples) I think]
which would return a vector of integers, each the (decimal) equivalent of
the (ISO-latin1) representation of the corresponding characters in ch.

This should be easy enough (and be done in C).
Any volunteers?

Martin Maechler <maechler at stat.math.ethz.ch>	http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum  LEO D10	Leonhardstr. 27
ETH (Federal Inst. Technology)	8092 Zurich	SWITZERLAND
phone: x-41-1-632-3408		fax: ...-1228			<><
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