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Consider the following example: # substitute a with b in the indicated function. Seems to work. > z <- substitute( function()a+1, list(a=quote(b)) ) > z function() b + 1 # z is an object of class call so use eval # to turn it into an object of class expression; however, # when z is evaluated, the variable a returns. > eval(z) function()a+1 Why did a suddenly reappear again

Thank you for the reference to Knuth. Indeed in vol. 2 he has a > -----Original Message----- > From: Tony Plate [mailto:tplate@blackmesacapital.com] > Sent: Friday, September 24, 2004 8:05 AM > To: Vadim Ogranovich > Subject: Re: [Rd] algorithm reference for sample() > > Have you tried looking in Knuth's books on computer > algorithms? (They are classics for good reason!) If I > remember correctly, a collea...

Just for fun (and actually because I would use it too) I wrote a version of the "paste" menu command that assumes the clipboard contains a transcript, and just pastes the commands from it into the R console window (Windows GUI only). So, if something like this: > foo <- + 33 > foo * 3 [1] 99 > foo [1] 33 is on the clipboard, then the "paste commands" menu

I was trying to create a function with a value computed at creation time, using substitute(), but I got results I don't understand: > this.is.R Error: Object "this.is.R" not found > substitute(this.is.R <- function() X, list(X=!is.null(options("CRAN")[[1]]))) this.is.R <- function() TRUE > # the above expression as printed is what I want for the

Hi everyone I've been playing with do.call() but I'm having problems understanding it. I have a list of "n" elements, each one of which is "d" dimensional [actually an n-by-n-by ... by-n array]. Neither n nor d is known in advance. I want to bind the elements together in a higher-dimensional array. Toy example follows with d=n=3. f <-

Does anyone have something like tapply that is extremely fast for matrices when there is a very large number of levels of the grouping variable? I'm referring to, for example, tapply(x, grouping.variable, function.operating.on.submatrix) where x is a matrix and the submatrix is a subset of the rows of x. The grouping variable's length equals the number of rows of x. -- Frank E

I'm trying to create a language structure that is a call to a function with a number of arguments that is only known at run time. I do this by using repeated indices to expand out a call with a single argument. However, when I change one of the arguments, all are changed. I don't see the same behavior when I initially create a call with multiple arguments. Even more strangely,

Tony, I don't understand what you mean. Could you give an example? > -----Original Message----- > From: Tony Plate [mailto:tplate at blackmesacapital.com] > > ... I'm not saying "never write functions that use ...", > >I'm just saying "never write functions that depend on a particular > >argument being passed via ...". > > Several reasons for not following that principle involve proliferatio...

Tony Plate wrote: > ligges@statistik.uni-dortmund.de wrote: > >> tplate@blackmesacapital.com wrote: >> >> >>> I've noticed that seek(con, 0, "end", rw="r") on a file connection >>> does not always work correctly after a write (R 2.1.0 on Windows). >>> >>> [Is a call to fflush() needed inside file_seek() in main/...

I'm consistently seeing R crash with a particular large data set. What's strange is that although the crash seems related to running out of memory, I'm unable to construct a pseudo-random data set of the same size that also causes the crash. Further adding to the strangeness is that the crash only happens if the dataset goes through a save()/load() cycle -- without that, the

tplate@blackmesacapital.com wrote: > I've noticed that seek(con, 0, "end", rw="r") on a file connection does > not always work correctly after a write (R 2.1.0 on Windows). > > [Is a call to fflush() needed inside file_seek() in main/connections.c?] If you have an idea where to f...

Full_Name: Lars Hansen Version: 2.8.0 OS: Linux Submission from: (NULL) (70.90.201.133) Hi, Calling installed.packages() on a directory with only one package causes an error if the priority argument is set to "NA": > installed.packages(lib.loc = "/home/lhansen/R/libs", priority = "NA") Error in mat[, "Package"] : incorrect number of dimensions This

It appears that the maximum number of connections available in R is about 48. Can anyone tell me how to bump this number up? I've been perusing the source, but any info would speed things up. Is there a reason that it was set to such a low number? Thanks for any help. -Frank

...ead.table(). > >-- >Brian Gough > >Network Theory Ltd, >Publishing the R Reference Manuals --- http://www.network-theory.co.uk/R/base/ > > > >------------------------------ > >Message: 2 >Date: Sat, 14 Aug 2004 07:42:31 -0600 >From: Tony Plate <tplate at blackmesacapital.com> >Subject: RE: [R] numerical accuracy, dumb question >To: MSchwartz at MedAnalytics.com, Dan Bolser <dmb at mrc-dunn.cam.ac.uk> >Cc: R-Help <r-help at stat.math.ethz.ch> >Message-ID: > <6.1.0.6.2.20040814073336.063d4778 at mailhost.blackmesacapital.com> &gt...

ligges@statistik.uni-dortmund.de wrote: > tplate@blackmesacapital.com wrote: > > >>I've noticed that seek(con, 0, "end", rw="r") on a file connection does >>not always work correctly after a write (R 2.1.0 on Windows). >> >>[Is a call to fflush() needed inside file_seek() in main/connections.c?] > &gt...

Dear list, I can not understand why the expression in the subject does not work correct: > dcrn[which(fn == inve[2])] numeric(0) > inve[2] [1] 406.7 > dcrn[which(fn == 406.7)] [1] 1.3994e-07 1.3988e-07 1.3953e-07 1.3966e-07 1.3953e-07 1.3968e-07 Is this a kick self problem or an bug? Thaks very much Thomas

In a quick search of the R website just now, I found no mention of a unit testing framework for R. I hope to find something in the style of Java's JUnit, or Python's unittest. Is such a thing available? Thanks, - Paul Shannon Institute for Systems Biology Seattle

Is it a bug that quantile() can return a lower sample quantile for a higher probability? > ##### quantile returns decreasing results with increasing probs (data at the end of the message) > quantile(x2, (0:5)/5) 0% 20% 40% 60% 80% -0.0014141174 -0.0009041968 -0.0009041968 -0.0007315023 -0.0005746115 100% 0.2905596324 >

...eek fseeko64 #define f_tell ftello64 #else #define f_seek fseek #define f_tell ftell #endif #endif Windows support for > 2Gb files seemed flaky, but we did not think it was R's job to report OS deficiencies. I've now used off64_t in file_seek under Windows. On Thu, 19 May 2005 tplate@blackmesacapital.com wrote: > This message relates to handling files > 2Gb under Windows. (I use 2Gb > as shorthand for 2^31-1 -- the largest integer representable in a signed > 32 bit integer.) > > First issue: truncate() is not able to successfully truncate files at a > position > 2Gb...

I would like to reference array dimensions by name in an apply and a summary function. For example: apply(x, "workers", sum) Is there a better way to do this than creating a new attribute for the array and then creating new methods for apply and summary? I don't want to name the individual elements of each dimension (such as with dimnames) but rather name the dimensions. Thanks