[R] Why does substr<- truncate and not replace...

Thomas Vogels tov at ece.cmu.edu
Fri Sep 7 22:02:52 CEST 2001

... when the replacement string is shorter than the portion of the
string to be replaced?

The documentation to substr (in R 1.3.1) gives me:

     If the portion to be replaced is longer than the replacement
     string, then only the portion the length of the string is

And so I try:

R> x <- "abcdef"
R> substr(x,2,3) <- "xy" #ok
R> x
[1] "axydef"
R> substr(x,2,3) <- "w" #ko
R> x
[1] "aw"

hmm, I would have expected "awdef".  Am I reading the docs wrong?  (Or
am I just blinded to expect this string because that's what Perl would do?)


mailto:tov at ece.cmu.edu (Tom Vogels)   Tel: (412) 268-6638   FAX: -3204

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