On Mon, 7 May 2007, Petr Savicky wrote: > Dear R developers, > > I suggest to modify the behaviour of "grep" function with fixed=TRUE option. > > Currently, fixed=TRUE implies ignore.case=FALSE (overrides ignore.case=TRUE, > if set by the user).
As it clearly says it does. > I suggest to keep ignore.case as set by the user even if fixed=TRUE. Since > the default of ignore.case is FALSE, this would not change the behaviour > of grep, if the user does not set ignore.case explicitly. > > In my opinion, fixed=TRUE is most useful for suppressing meta-character > expansion. On the other hand, for a simple word search, ignoring > case is sometimes useful. Well, it was written to use in R's own code as a quick way to match a fixed sequence of bytes. It is not suitable for a 'word' search as it does not (just) match to words. > If for some reason, it is better to keep the current behavior of grep, then I > suggest to extend the documentation as follows: > > ORIGINAL: > fixed: logical. If 'TRUE', 'pattern' is a string to be matched as > is. Overrides all conflicting arguments. > > SUGGESTED: > fixed: logical. If 'TRUE', 'pattern' is a string to be matched as > is. Overrides all conflicting arguments including ignore.case. Oh come on, ignore.case clearly conflicts with 'as is'! Adding unnecessary qualifiers just makes the text harder to read. I suggest you collaborate with the person who replied that he thought this was a good idea to supply patches against the R-devel sources for scrutiny. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
