Percent(denom=Equal(X_CNTY), fn=LCI) +
Percent(denom=Equal(X_CNTY), fn=UCI), data=nh.smart)
You'll need to write the LCI and UCI functions to compute the confidence
limits. I don't know how to extract those from the objects you've got;
you may need t
on? There are examples on the
help page, though I don't think a mosaic plot is there.
Duncan Murdoch
Many thanks!
My best.
--
QQ: 1733768559
[[alternative HTML version deleted]]
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ction uses it, the x and y
variables are evaluated in the original context.
In your example, as.formula() will convert the string to a formula, and
attach the current environment. So you'd better hope that whatever
variable yname names, as well as time and gvhd, are all available there.
Duncan Murd
I am turning my attention to
> the namespace now. Am I correct this can be a handled by the namespace?
>
I would guess you have imported the lubridate and plyr packages, and
also defined your own duration() and here() functions, hiding theirs.
Duncan Murdoch
> Thanks,
> Glenn
tion. W hat you want is
lm(y ~ I((x<=10)*x) + I(x>10 & x<=20) + I((x>20)*x))
This doesn't give exactly the same results as the segmented regression,
because it uses the same intercept in all three segments; you might want
to add I(x <= 10) as well if you don't w
4 bit dlls, in which
case both versions can use the binary of the package.
If you've already done all that, then you'll need to give more details,
e.g. access to the source for the package, to get more specific help.
Duncan Murdoch
__
R-h
On 15/02/2015 10:08 AM, Sun Shine wrote:
> Thanks John: understanding it as a line return makes sense!
But it's not right. This is one statement, and it returns the value 3:
1 +
2
This is an error:
1 + ; 2
The semicolon is a statement separator, not a line return.
Duncan
On 15/02/2015 11:20 AM, John McKown wrote:
> On Sun, Feb 15, 2015 at 9:54 AM, Duncan Murdoch
> mailto:murdoch.dun...@gmail.com>>wrote:
>
> On 15/02/2015 10:08 AM, Sun Shine wrote:
> > Thanks John: understanding it as a line return makes sense!
>
> Bu
> Raja Dey, Ph. D.UCONN
You're writing to the wrong place. You need to write to your course
instructor, we have no idea about your course.
Duncan Murdoch
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ther than exporting the strings, it's easier to export a function that
produces the strings, e.g.
fig <- function(name) system.file(file.path("fig", name), package="foo")
to be called as
fig("man.png")
Duncan Murdoch
__
R2 has a missing value, you get NA from the equality tests,
but FALSE from the %in% tests. That won't affect subset (where NA and
FALSE both result in the omission of the observation), but it might
affect other code like this. For example, if you
of the
Introduction to R for a description of how to define these.)
Duncan Murdoch
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PLEASE do read the posting guide http://www.R-project.
n that
links to the original docs. (I notice it doesn't escape % properly, so
the generated page for "%>%" wouldn't work; sigh.)
Duncan Murdoch
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ers.) If you're using some other front-end,
you'll need to read its documentation.
Duncan Murdoch
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PLEASE do read the posting
On 19/02/2015 3:13 PM, Samuel Colon wrote:
> Hello All,
>
> I'm new to this mailing list, so please let me know if I've committed any
> posting faux-pas.
Yes, you should probably be using the Coursera support resources instead
of this list.
Duncan Murdoch
>
> I&#x
wever, the legend is still in red color.
> I need the legend be in black color.
> How can I get rid of the red color in the legend produced by'corrplot'?
See the help page ?corrplot. It appears that the ... argument to
corrplot.mixed can be any of the arguments to corrplot, an
ample, I wanted to verify that this is in fact unexpected
> behavior (under R 3.1.2)?
Before I spend the time thinking about that, I'd like to see a
reproducible example.
Duncan Murdoch
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ld be at the word dates in the first line of the
> plot.fore4nodate line.
>
> This is making me a little nuts. Actually a lot nuts.
>
> If anyone can see anything, I would really appreciate any suggestions.
Generally percent symbols (%) need to be escaped in Rd files. So t
On 21/02/2015 2:47 PM, Erin Hodgess wrote:
> I have Windows, but the "R CMD INSTALL --build pack" does not produce a
> compiled zip.
What does it do? Can you show us a transcript?
Duncan Murdoch
>
> Thanks,
> Erin
>
>
> On Sat, Feb 21, 2015 at 1:49 PM,
", x$data.name, "\n\n")
pp <- format.pval(x$p.value, digits, na.form = "-")
attributes(pp) <- attributes(x$p.value)
print(pp, quote = FALSE, ...)
cat("\nP value adjustment method:", x$p.adjust.method, "\n")
invisible(x)
}
Your d
the location of the crash. As far as I know only gdb supports debugging
R on Windows (there's a copy in the Rtools collection), but perhaps that
will change now that Microsoft has purchased Revolution Analytics.
Duncan Murdoch
__
R-help@r-project.o
ept
# call the knitr latex hook
# restore the options
}
knitr::knit_hooks$set(fullpage = hook_fullpage)
Then any chunk where you wanted this kind of inclusion you'd use the
fullpage=TRUE option, and knitr
would insert a bit of LaTeX code into the middle of your markdown document.
Duncan Murd
har(sub("^[[:digit:]]*[.]", "", a))
should work. (Note that default formatting is scientific for 0.0001.) If
you want some other formatting, then format first, and pass a character
object, e.g.
chars <- format(a, scientific = FALSE)
nchar(sub("
ly
numbers that you need. You'd use code like this to produce the matrix:
results <- matrix(NA_real_, 1, ncols = however many you keep )
for (i in 1:1) {
fit <- code to get the fit object
results[i,] <- with(
an OS.
If you want it to start 1000 seconds from now, use Sys.sleep(1000) as
your first statement. You'll have a process sitting there using no CPU
(but perhaps lots of virtual memory) until the sleeping is done. Using
cron is better.
Dunc
e works because in the cases where x$c is NA, it
evaluates NA | TRUE, and that evaluates to TRUE. In the cases where x$c
is not NA, you get x$c < 6 | FALSE, and that's the same as x$c < 6,
which will be either TRUE or FALSE.
Duncan Murdoch
_
thout actually triggering a warning or error.
BTW, I should have mentioned that the example where you indexed using
-which(x$c>=6) is a bad idea: if none of the entries were 6 or more,
this would be indexing with an empty vector, and you'd get nothing, not
everything.
Duncan Murdoch
$c<6) | is.na(x$c),]
I would write it as
x[is.na(x$c) | x$c < 6,]
but that's purely a style difference, I don't think it would affect
execution time (or results). I like to put the weird case first because
it will remind me that things are more complicated than you might guess.
construct that list as
structure(list(sum(get(bvar))), names=sumvar)
i.e. the full expression would be
dt_min <- dt[, structure(list(sum(get(bvar))), names=sumvar), by=list(a)]
The idea is that structure() produces list(sum(get(bvar))) with
attribute "names" set to the contents of sumvar.
;) give you in R? If it is just a character
string (e.g. "xdg-open" is what I get in Ubuntu), does it work from your
command line, outside of R, e.g. for me that test would be
xdg-open http://www.r-project.org
If that doesn't work, but you can figure out a command line way to op
On 28/02/2015 6:43 PM, Rolf Turner wrote:
>
> See inline below.
>
> On 01/03/15 10:59, Duncan Murdoch wrote:
>> On 28/02/2015 4:10 PM, Rolf Turner wrote:
>>>
>>> Firefox recently updated itself on my laptop. Now when I ask for R help
>>> --- e.g. ?
is TRUE; I had thought it
wasn't.
The -remote arg is also used for mozilla and opera; is it needed there?
Duncan Murdoch
>
> Best,
> Ista
>
> On Sun, Mar 1, 2015 at 7:14 AM, Duncan Murdoch
> wrote:
>> On 28/02/2015 6:43 PM, Rolf Turner wrote:
>>>
>
appreciated.
Setting the filename using the file.choose() function is usually
easiest. I.e.
f <- file.choose()
perf_data <- read.csv(f)
You'll get the usual file choose dialog (at least in Windows and OSX;
not sure about Linux) when file.choose() runs and can navigate to the
file. The fu
g to do. (Of
course, as the package evolves, the paper might become obsolete; then
you have a problem: update it, or just declare it of historical interest?)
Duncan Murdoch
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showing what you're
starting with, and what you want to produce. From what you wrote, I'd
guess merge(), not match(), but you might really be asking for something
completely different.
Duncan Murdoch
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You seem to be talking about something in the RStudio front end, not in
R, which means you're writing to the wrong place. They have their own
support forums.
Duncan Murdoch
On 18/03/2015 4:59 PM, Chad Danyluck wrote:
> I use R Studio (Version 0.98.994 on Mac) and R version 3.1.1 (20
ts
from nabble; perhaps they are now banned completely.
Duncan Murdoch
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.h
t;> 16*pi*(5^3)*(log(5+40) - log(5) - 40/(40+5))
> [1] 8220.516
>
> However, I can not try the same with cubature since the code is prepared only
> to be
> used in hypercubes.
I don't know how well the cubature package would deal with the
discontinuity, but a simple way to
point me to the right doc.
See the ?Startup help topic. You probably want to use one of the
profile files rather than .First, because .First needs to be in a
workspace, and you shouldn't be loading a workspace every time.
Duncan Murdoch
__
R-hel
rep(1, nrow(df1)), rep(2, nrow(df2)), rep(3, nrow(df3
# Create an empty dataframe to hold the results
df <- data.frame(strat=NA, id=NA, pid=NA)[rep(1, length(sel)),]
# Put the original dataframes into the appropriate slots:
df[sel == 1,] <- df1
df[sel == 2,] <- df2
df[sel == 3,] <-
atically
within a function?
Sarah, still sure I'm missing something obvious
The matrix() function has a dimnames argument, so you could do this:
names <- c("strat", "id", "pid")
data.frame(matrix(NA, nrow=10, ncol=3, dimnames=list(NULL, names)))
Duncan Mur
, but that's likely slower and less accurate than other equivalent
ones, such as x %*% solve(A, x), and I wouldn't be surprised if there
are better ones.
Duncan Murdoch
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n 3.0.1-1
>
The Cygwin release is not supported by us, and is known to be buggy,
because it doesn't handle line endings properly.
You'll need to talk to the Cygwin folks if you can't reproduce this in
one of our releases available from cran.r-project.org/bin/windows/base.
Duncan
s the reserved words (see section
10.3.3). It oversimplifies things, saying they can't be used as
variable names, when in fact almost any string can be used with proper
quoting. For example, both of these work:
"function" <- "Not an
ng on Windows, in a non-UTF-8 locale?
Posting sessionInfo() would be helpful.
Duncan Murdoch
-Farid
On Sun, Aug 12, 2018 at 7:24 AM, Jeff Newmiller
wrote:
... and read the Posting Guide... only a few file types will ever make it
through the mailing list so repeatedly sending files not among thos
%
source() %>%
close() # works fine
is a nice way to avoid this problem.
Duncan Murdoch
R version 3.5.1 (2018-07-02)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)
Matrix products: default
locale:
[1] LC_COLLATE=English_United States.1
rt
when you get the segfault. I don't know which report will be more
informative.
Duncan Murdoch
and got a lot of (mysterious to me) output:
/usr/local/bin/valgrind R
==18051== Memcheck, a memory error detector
==18051== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==18
nverse of the original
spline interpolator except at observed (x,y) pairs, but will usually be
close, especially if the functions are pretty smooth.
Duncan Murdoch
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p will probably not result in any action on it. Posting it to
the bug page will at least result in a fairly permanent record.
Duncan Murdoch
thanks
Farid
On Sun, Aug 12, 2018 at 9:03 PM, Duncan Murdoch
mailto:murdoch.dun...@gmail.com>> wrote:
On 12/08/2018 11:48 AM, Far
s sum(x)/length(x), so if x is length 0, you
get 0/0 which is NaN.
median(x) is documented in its help page to give NA for x of length 0.
sd(x) is documented to give an error for such x and NA for length 1, but
it gives NA for both.
Duncan Murdoch
x <- c(NA, NA, NA) mean(x, na.rm=TRUE)
ation: default
---
```{r global_options, echo=FALSE}
knitr::opts_chunk$set(tidy=TRUE,
warning=FALSE,
message=FALSE,
cache=FALSE,
dpi = 300)
Drop the dpi setting and it will work fine.
Duncan Murdoch
L, 0L). Better to use
for ( i in seq_along(var1) ) {
Duncan Murdoch
elem1 <-var1[i]
elem2 <- var2[i]
}
if you want more abstraction you could then wrap that up in a function
HTHOn 25 Aug 2018 18:57, Jeff Newmiller wrote:
look at the map2 function in the purrr package.
On August 24
On 25/08/2018 7:37 PM, Patrick Connolly wrote:
On Sat, 25-Aug-2018 at 07:53AM -0400, Duncan Murdoch wrote:
|> On 25/08/2018 6:21 AM, Patrick Connolly wrote:
|> >---
|> >title: "Barking up the wrong tree"
|> >author: "Patrick Connolly"
|> >
On 26/08/2018 3:10 AM, Jeremie Juste wrote:
Duncan Murdoch writes:
for ( i in 1:length(var1)){
This is generally a bad idea: if length(var1) == 0, it does the wrong
thing, since 1:0 is c(1L, 0L). Better to use
for ( i in seq_along(var1) ) {
granted. One should check the validity of
On 26/08/2018 4:40 AM, Patrick Connolly wrote:
On Sat, 25-Aug-2018 at 08:10PM -0400, Duncan Murdoch wrote:
|> On 25/08/2018 7:37 PM, Patrick Connolly wrote:
|> >On Sat, 25-Aug-2018 at 07:53AM -0400, Duncan Murdoch wrote:
|> >
|> >|> On 25/08/2018 6:21 AM
113569
This might just be a typo in your message, but as.character() is the
function you want, not as.Character().
The other typo or error above is that you are trying to convert
dp$sampdate, but the dataframe has no column with that name according to
the lines above.
Duncan Murdoch
I don&#x
y(xhth)
You could use
table(cut(xht, breaks=2*(0:5)))
which produces
(0,2] (2,4] (4,6] (6,8] (8,10]
2 2 2 2 2
for your dataset.
Duncan Murdoch
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Thank you.
Use traceback() to see which function called stri_split_regex.
Break up the long pipeline into smaller parts so you can see where the
error is comming from.
Don't post in HTML.
Duncan Murdoch
__
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o use
other characteristics as well, such as the symbol. You could plot 21
different letters in 5 different colours and it might work, but it's not
going to be easy for viewers.
Duncan Murdoch
I could pick them by hand, but that is about 15 colours more than I know (I
have a detailed c
xactly the
arguments to the bookdown::gitbook function. It passes ... to
rmarkdown::html_document, so those arguments are available too.
If you're using a different bookdown output format, the allowed entries
will be the arguments to whatever function you use.
to make the URL predictable, either by something like
options(help.ports = 12345)
(which will put help on port 12345, blocking that port for any other
use, including help in another R session), or by putting a static copy
of the help pages on some other web server.
Duncan Murdoch
On 22/09/2018 4:14 AM, Martin Maechler wrote:
Duncan Murdoch
on Fri, 21 Sep 2018 05:02:32 -0400 writes:
> On 21/09/2018 4:54 AM, Sigbert Klinke wrote:
>> Hi,
>>
>> is it possible to make a link from a vignette to a (Rd)
>> help files
.
It is very similar to (but probably a little faster than)
log(c1[2:len]/c1[1:(len-1)])
There are differences in borderline cases (like length(c1) != len, or
len < 2) that are not relevant in the original context.
Duncan Murdoch
Thank you,
John
John David Sorkin M.D., Ph.D.
Professor
function
so it acts as if it is vectorized.
The "performance penalty" part of your statement is true. It will
generally save some computing cycles to write a new function using a for
loop instead of using Vectorize(). But that may waste some programmer time.
Duncan Murdoch
(writ
"try it and see". Sometimes it probably helps a lot,
sometimes it's probably detrimental.
Duncan Murdoch
P.S. I last worked in a corporate computing environment 40 years ago
when I was still wet behind the ears, so you'd probably want to ask
someone else. However, more rec
s though for
submission there enforces some good coding and documentation practices.
Duncan Murdoch
And there are publications like "R Journal" that are looking for
descriptions of what you've done. I have a paper in "R Journal"
describing the "sos" pa
s far as I recall, this is an undocumented implementation
detail, and you aren't supposed to count on it.
2. You could write an as.list() method for the Wave class, then
with(as.list(Wobj),
would work. This may be the "right" way to do this.
Duncan Murdoch
nt the regular one sometimes and a custom one other times,
you could make your own panel function:
panel.cor2 <- function(...) panel.cor(..., prefix = "r = ")
Then use
pairs(USJudgeRatings, lower.panel = panel.smooth, upper.panel =
panel.cor2, gap=0, row1attop=FALSE)
Duncan Mur
you talking about? On Unix-alikes, you'd need an "echo"
ahead of that, and it would print the user's working directory, not the
working directory of the script.
Duncan Murdoch
__FILE__ in C relates to the source code directory that is usually not where
the executable
irectory of the script.
At least for me (I am running on the last version of Ubuntu)...
Not for me. Always prints the user's working directory.
Duncan Murdoch
Best regards,
Olivier
----
*De :* Duncan Murdoch
*E
On 10/10/2018 11:20 AM, Duncan Murdoch wrote:
On 10/10/2018 11:18 AM, Olivier GIVAUDAN wrote:
Hi Duncan,
Yes, if you need to display the content of $PWD you obviously need to
type 'echo' before this variable.
It prints the user's working directory if run from a terminal but if
believable that you are seeing
anything different from that on a Unix-alike.
Duncan Muroch
--------
*De :* Duncan Murdoch
*Envoyé :* mercredi 10 octobre 2018 15:20
*À :* Olivier GIVAUDAN; Jeff Newmiller
*Cc :* r-help@r-projec
ctory in
your source. When the package is installed, those files will be moved
up one level, i.e.
Olivier/inst/foo
will become
system.file("foo", package = "Olivier")
Duncan Murdoch
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R-help@r-project.org mailing list --
rk using package.skeleton().
Really, if you are distributing R code, you should do it in the standard
way, not invent your own.
Duncan Murdoch
--------
*De :* Duncan Murdoch
*Envoyé :* mercredi 10 octobre 2018 20:54
*À :* Olivier
directory of the
program they are running, because the ones you've tried do it that way.
But they don't.
Duncan Murdoch
------------
*De :* Duncan Murdoch
*Envoyé :* mercredi 10 octobre 2018 21:39
*À :* Olivier GIVAUDAN; Jef
is not a good idea. It might be a good idea,
if you know the system very, very well. Otherwise, it's probably better
to work the standard way.
Duncan Murdoch
For example, you might thinkthat all front ends set the working
directory to the directory of theprogram they are running, b
ve it (batch, shell,
C, LaTeX, SAS with macro-variables, etc.)?"
Duncan Murdoch
--------
*De :* Duncan Murdoch
*Envoyé :* mercredi 10 octobre 2018 22:31
*À :* Olivier GIVAUDAN; Jeff Newmiller
*Cc :* r-help@r-project.org
*Obje
d out what line foo starts on, using
fooline <- getSrcLocation(foo)
This is a lot like __LINE__ in C.
Duncan Murdoch
'getwd()' is indeed not equivalent to VBA
'Application.ThisWorkbook.Path' or C macro '__FILE__' or SAS
%sysget(SAS_EXECFILENAME), etc.
---
or of filenames.
Duncan Murdoch
I have not tried RUI's yet, but i will if nothing else works out.
Thanks again--EK
had to strip off file.names from the extension PDF, but when i paste
the month.name with .PDF to get the correct file names, i am getting
the same error.
On Tue, Oct 9, 2018
On 10/10/2018 8:08 PM, Olivier GIVAUDAN wrote:
I think Gabor (at least) already suggested this solution. But the
problem is: how do you source this file containing this 'foo' function
without writing its absolute path?
You only need its relative path to source it.
Duncan Murdoc
onnect.com/content/2671/Combining-Shiny-R-Markdown.html>.
Other than my two notes above, your comments about Rmarkdown seem
right on the mark.
Duncan Murdoch
I'm trying to do real time monitoring of the broadcast quality of
a radio station, and it seems to me that it may be e
that what you meant?
What would probably be best is if you showed us a simple example of what
you are doing, and then referred to the results from that when saying
what you want to extract.
Duncan Murdoch
We therefore ask, is it possible for us to get the Summary(Model) column by
column, i.
x27;t know why others didn't
Duncan Murdoch
On October 26, 2018 1:11:19 PM PDT, Jeremie Juste
wrote:
Hello,
I suspect the error is in the file input-summerize.R.
I creating a new file input-summerize2.R with only print("hello") for
instance and check if
setwd(
ere is my scope problem
if (c==1) bar1()
if (c==2) bar2()
# some more code
cat(sprintf('foo: x=%d, y=%d, z=%d\n', x, y, z))
}
foo(c=0)
foo(c=1)
foo(c=2)
I get this output:
> foo(c=0)
foo: x=0, y=0, z=0
> foo(c=1)
bar1: x=1, y=1, z=1
foo: x=1, y=1, z=1
> foo(c=2)
bar2
problem
if (c==1) bar1(environment())
if (c==2) bar2(environment())
# some more code
cat(sprintf('foo: x=%d, y=%d, z=%d\n', x, y, z))
}
foo(c=0)
foo(c=1)
foo(c=2)
Duncan Murdoch
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uot;]]
y <- result[["y"]]
z <- result[["z"]]
Duncan Murdoch
- Original Message -
From: "Duncan Murdoch"
To: "Sebastien Bihorel" ,
r-help@r-project.org
Sent: Tuesday, October 30, 2018 4:13:05 PM
Subject: Re: [R] Question about function
[1] FALSE FALSE TRUE TRUE
What I want is a fast way to calculate
[1] NA NA 2 1
or (equally useful to me)
[1] 1 2 2 1
The result should have the property that if result[i] == j, then v[i] ==
v[j], at least for i != j.
Does this already exist somewhe
On 13/11/2018 12:35 AM, Pages, Herve wrote:
Hi,
On 11/12/18 17:08, Duncan Murdoch wrote:
The duplicated() function gives TRUE if an item in a vector (or row in
a matrix, etc.) is a duplicate of an earlier item. But what I would
like to know is which item does it duplicate?
For example,
v
adley's vectors package is addressing?
I don't know; hopefully someone else will respond...
Duncan Murdoch
Bill Dunlap
TIBCO Software
wdunlap tibco.com <http://tibco.com>
On Tue, Nov 13, 2018 at 2:15 AM, Duncan Murdoch
mailto:murdoch.dun...@gmail.com>> wrote:
On 13
t should contain the values of the two factors to your
model that you are holding fixed while plotting the two that are not fixed.
This Stackoverflow answer
https://stackoverflow.com/questions/53349811/how-to-draw-a-response-surface-plot-for-three-factorial-design/53350259#53350259
describes a w
functions like open3d(), not the
low-level rgl.* functions like rgl.open().)
The rgl.postscript() display is limited by what the GL2PS library can
do, so if it doesn't do what you want, there's not much you can do to
improve it.
Duncan Murdoch
Can somebody please show me
u multiply by 100, you get the exactly correct
result. Then the apparent rule for round(x, 2) is: multiply by 100,
round to an integer, divide by 100.
Duncan Murdoch
Therefore, according to the arithmetic rules, rounded 0.014 to the second
digit is 0.01. Also, the round() function in other
? What version? What locale?
Duncan Murdoch
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t,
otherwise it is assumed to be a text file, and LF is changed to CR LF.
There may also be handling of EOF marks, I forget.
Duncan Murdoch
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n read how to do it
here: <https://shiny.rstudio.com/articles/js-send-message.html>.
Duncan Murdoch
Thanks for any input.
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tr issue. I don't know if Yihui reads this list;
you'd probably be better off on StackOverflow or filing an issue as
described at https://yihui.name/knitr/faq/.
Duncan Murdoch
My code:
```{r setup, include=FALSE}
## Set the global chunk options for knitting reports
knitr::opts
am
Files\R\R-3.5.1\bin\x64\Rgui.exe"
Not sure what your question is, but the executable is called Rterm.exe,
and should be in the same directory as Rgui.exe.
Duncan Murdoch
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C","D": 1 1 2 2 1
Thank you
I don't think read.table() can do it for you automatically. To do it
yourself, you need to get a vector of the levels. If you know this,
just assign it to a variable; if you don't know it, compute it as
thelevels <- unique(unlist
an add levels this way:
levels> f <- factor(c("a","b"))
levels> levels(f) <- c("c", "a", "b")
levels> f
[1] c a
Levels: c a b
levels> f <- factor(c("a","b"))
levels> levels(f) <- list(C = "C&q
around R.
Duncan Murdoch
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