At 16:53 18.07.2005 +0200, Heinz Tuechler wrote: >At 09:29 18.07.2005 -0500, Frank E Harrell Jr wrote: >>Heinz Tuechler wrote: >>> Dear All, >>> >>> it seems to me that levels() deletes other attributes. See the following >>> example: >>> >>> ## example with levels >>> f1 <- factor(c('level c','level b','level a','level c'), ordered=TRUE) >>> attr(f1, 'testattribute') <- 'teststring' >>> attributes(f1) >>> levels(f1) <- c('L-A', 'L-B', 'L-C') >>> attributes(f1) >>> >>> If I run it, after assigning new levels, the class is only "factor" instead >>> of "ordered" "factor" and the $testattribute "teststring" is gone. >>> >>> The same happens to the label() attribute of Hmisc. >>> >>> ## example with levels and label >>> library(Hmisc) >>> f1 <- factor(c('level c','level b','level a','level c'), ordered=TRUE) >>> label(f1) <- 'factor f1' >>> attr(f1, 'testattribute') <- 'teststring' >>> attributes(f1) >>> levels(f1) <- c('L-A', 'L-B', 'L-C') >>> attributes(f1) >>> >>> Should I expect this behaviour? >> >>Does the same thing happen when you do >> >> attr(f1,'levels') <- c('L-A',...) >> >>Frank > >No, it does not. With attr(f1,'levels') <- c('L-A', 'L-B', 'L-C') only the >levels are changed, all other attributes remain as before. >Heinz > I think, I know why attr(f1,'levels') behaves different from levels(f1) <- . As far as I see, the method of levels for factor does not use attr() but factor(). Heinz >>> >>> Thanks >>> >>> Heinz >>> >>> # R-Version 2.1.0 Patched (2005-05-30) >>> # Windows98 >>> >>> ______________________________________________ >>> R-help@stat.math.ethz.ch mailing list >>> https://stat.ethz.ch/mailman/listinfo/r-help >>> PLEASE do read the posting guide! >http://www.R-project.org/posting-guide.html >>> >> >> >>-- >>Frank E Harrell Jr Professor and Chair School of Medicine >> Department of Biostatistics Vanderbilt University >> >> > >______________________________________________ >R-help@stat.math.ethz.ch mailing list >https://stat.ethz.ch/mailman/listinfo/r-help >PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html > >
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