Heinz Tuechler wrote:
Dear All!
If I try to compare the attributes of two objects, I find a surprising
behaviour of attr.all.equal(). With identical attributes I receive the
answert NULL. If the attributes differ, the answer is as expecxted and
differences are shown.
all.equal(attributes(), attributes()) instead returns TRUE, if
attributes are equal.
That _is_ as documented, although if you want to quibble, it should
probably also have been mentioned in the Value section.
I don't know if there's a a rationale for it. The actual code goes
msg <- NULL
if (....) msg <- c(msg, some text)
if (.....
msg
so it returns NULL if none of the ifs are taken, but it could easily be
changed to return
if (is.null(msg)) TRUE else msg
("easily" depending, of course, on how much code actually depends on the
current behaviour...)
See example:
v <- 1:5
attr(v, 'testattribute') <- 'testattribute v'
v_c <- v
attributes(v)
$testattribute
[1] "testattribute v"
attributes(v_c)
$testattribute
[1] "testattribute v"
all.equal(v, v_c)
[1] TRUE
attr.all.equal(v, v_c)
NULL << - - - - - - - - - - here is, what I don't expected
all.equal(attributes(v), attributes(v_c))
[1] TRUE
attr(v_c, 'testattribute') <- 'testattribute v_c'
attr.all.equal(v, v_c)
[1] "Attributes: < Component 1: 1 string mismatch >"
all.equal(attributes(v), attributes(v_c))
[1] "Component 1: 1 string mismatch"
Thanks for your attention
Heinz Tüchler
Version:
platform = i386-pc-mingw32
arch = i386
os = mingw32
system = i386, mingw32
status = Patched
major = 2
minor = 8.0
year = 2008
month = 11
day = 04
svn rev = 46830
language = R
version.string = R version 2.8.0 Patched (2008-11-04 r46830)
Windows XP (build 2600) Service Pack 2
Locale:
LC_COLLATE=German_Austria.1252;LC_CTYPE=German_Austria.1252;LC_MONETARY=German_Austria.1252;LC_NUMERIC=C;LC_TIME=German_Austria.1252
Search Path:
.GlobalEnv, package:stats, package:graphics, package:grDevices,
package:utils, package:datasets, package:methods, Autoloads, package:base
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