hashing using named lists
On Thu, 18 Nov 2004, Huntsinger, Reid wrote:
It seems that that behavior is hard-coded in the subscript code,
the behaviour being partial matching?
but I bet you could fix it easily by changing the call to get1index
offset = get1index(CAR(subs), getAttrib(x, R_NamesSymbol),
length(x), /*partial ok*/TRUE, i);
in src/main/subset.c (line 762 I think, R-2.0.0) to supply FALSE in place of
TRUE and recompiling... I haven't tried yet though so maybe I'm quite badly
wrong.
That is the [[ ]] code. The $ code is at about line 968. And if you did that a lot of R code may break, so please don't even think about it. Partial matching is a long-standing feature. There have been proposals from time to time for [ ] and [[ ]] to have an exact=TRUE argument for character indices. That seems a good idea, except that they are generic and there are now many methods out there which would ignore the argument.
Reid Huntsinger -----Original Message----- From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of ulas karaoz Sent: Thursday, November 18, 2004 11:30 AM To: r-help at stat.math.ethz.ch Subject: [R] hashing using named lists hi all, I am trying to use named list to hash a bunch of vector by name, for instance: test = list() test$name = c(1,2,3) the problem is that when i try to get the values back by using the name, the matching isn't done in an exact way, so test$na is not NULL. is there a way around this? Why by default all.equal.list doesnt require an exact match? How can I do hashing in R? thanks. ulas.
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Brian D. Ripley, ripley at stats.ox.ac.uk 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