R-alpha: New version of R for testing

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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