[R] Difference between SPlus & R question

[Prof Brian D Ripley]

On Thu, 22 Jun 2000, Marc Feldesman wrote:

> In S-Plus, I do the following:
> 
> v1<-rnorm(50)
> v2<-rnorm(50)
> v3<-"gorilla"
> v4<-cbind(v1, v2)
> v5<-data.frame(v4, v5)

v5<-data.frame(v4, v3)?

> 
> v5 is a dataframe with 50 rows and 3 columns.  The third column has 
> "gorilla" replicated for all 50 rows - the behavior I desire.  (It also 
> works if I simply do:
> 
> v5<-data.frame(v1, v2, v3)
> 
> leaving out the cbind() step altogether.

These do not work in S-PLUS 3.4 (`the prototype').


> If I try the same thing in R, it rejects v5, reporting an error that v4 has 
> 50 rows while v3 has 1 row.
> 
> What is the proper way to achieve the same result in R?

data.frame(v1, v2, v3=rep("gorilla", 50))

will certainly do.


The bug (if it is considered to be one) is at the line

        if (length(xi) == 1 && nr%%nrows[[i]] == 0 && is.vector(xi[[1]])) 
            value[[i]] <- list(rep(xi[[1]], length = nr))

in data.frame.  is.vector is too severe a test, failed by a factor.


-- 
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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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