R-alpha: New version of R for testing

[Peter Dalgaard BSA]

Ross Ihaka <ihaka@stat.auckland.ac.nz> writes:

> NEW FEATURES
> 
>  o  "expressions" are now implemented as a basic type rather than as
>     a class of object.  This change was made as move toward compatibility
>     with S and also to implement mathematical annotation in graphs.

Something looks wrong:

> expression(2+2)
expression(2 + 2)
> expression(2+2)[[1]]
expression(2 + 2)
> expression(2+2)[[1]][[1]]
expression(2 + 2)

- How the blazes is a poor soul supposed to get at the parse tree for
an expression? According to the docs, an expression is supposed to be
a list of calls, but obviously

> mode(expression(2+2)[[1]])
[1] "expression"

----------

Another piece of weirdness:

> t(table(0))
Error: dimnames: number of dimensions must equal number of names

# That one used to cause a segmentation fault (my bug report for it
# seems to have fallen off of the TASKS list - bug suicide?)

> t(as.matrix(table(0)))
     0
[1,] 1

# Looks OK now ... or is it? Watch:

> ?ls
Warning: invalid 'cutoff' for deparse, used default
#^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        
        List Objects

             ls(name, pos=2, envir=sys.frame(sys.parent()),
                    all.names=FALSE, pattern)

Same thing happens if you omit the 2nd expression.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907
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