similar to: Which data structure in R can mimic hash in PERL best?

For learning purposes mainly I attempted to implement hashes/maps/dictionaries (Python lingua) as S4 classes, see the coding below. I came across some rough S4 edges, but in the end it worked (for one dictionary). When testing ones sees that the dictionaries D1 and D2 share their environments D1 at hash and D2 at hash, though I thought a new and empty environment would be generated each time

On Tue, Oct 13, 2015 at 4:43 PM, Hadley Wickham <h.wickham at gmail.com> wrote: > Seems easy enough to write yourself: > > where <- function(x, env = parent.frame()) { > if (identical(env, emptyenv())) > return(NULL) > if (exists(x, envir = env, inherits = FALSE)) > return(env) > where(x, parent.env(env)) > } > > sample2 <-

I was surprised just now to find out that `topenv(emptyenv())` equals ? `.GlobalEnv`, not `emptyenv()`. From my understanding of the description of `topenv`, it should walk up the chain of enclosing environments (as if by calling `e = parent.env(e)` repeatedly; in fact, that is almost exactly its implementation in envir.c) until it hits a top level. However, `emptyenv()` has no enclosing

Hi, this relates to the question "How to set a former environment?" asked yesterday. What is the best way to to return a function with a minimal environment from a function? Here is a dummy example: foo <- function(huge) { scale <- mean(huge) function(x) { scale * x } } fcn <- foo(1:10e5) The problem with this approach is that the environment of 'fcn' does not

Hi, I'm trying to write a general-purpose "lexicon" class and associated methods for storing and accessing information about large numbers of specific words (e.g., their frequencies in different genres). Crucial to making such a class practically useful is to get hashing working correctly so that information about specific words can be accessed quickly. But I've never really

Hello R-philes: I have the following function that gets the output of mget() and converts it to a data frame to return. What I am finding is that the dimensions are wrong. Basically, I get: bridesmaid wed u see m gt lt like love X.0 dress pagetrack one go X3 get 1 56 35 27 30 24 20 20 23 28 17 25 16 16 28 15 26 Instead, I want something like: [1] bridesmaid

I wish I had started with "I am disappointed that lm() doesn't continue its search for weights into the calling environment" or "the fact that lm() looks only in the formula environment and data frame for weights doesn't seem consistent with how other values are treated." But I did not. So I do apologize for both that and for negative tone on my part. Simplified

Hi list, This looks similar to the problem reported here https://stat.ethz.ch/pipermail/r-devel/2006-April/037199.html by Henrik Bengtsson a long time ago. It is very sporadic and non-reproducible. Henrik, do you remember if your code was using reg.finalizer()? I tend to suspect it but I'm not sure. I've been hunting this bug for months but today, and we the help of other Bioconductor

Dear R gurus, I need to know the length of a variable (let's call that X) that is mentioned in a formula. So obviously I look for the environment from which the formula is called and then I have two options: - using eval(parse(text='length(X)'), envir=environment(formula) ) - using length(get('X'), envir=environment(formula) ) a bit of

Dear List I have experienced that objects generated with one of my packages used a lot of space when saved on disc (object.size did not show this!). some debugging revealed that formula and call objects carried the full environment of subroutines along, including even stuff not needed by the formula or call. here is a sketch of the problem ,---- | test <- function(x){ | x <-

Hi I am trying to configure the last_login plugin with LDAP dictionary which is causing dict service to crash. Not sure if this is a bug or some configuration parameter I'm getting wrong? Running latest dovecot but was having the same problem in earlier version 2.2.25 # dovecot --version 2.2.28 (bed8434) I have configured dovecot like so: dovecot.conf (before conf.d/*.conf: dict {

On Wed, Mar 22, 2017, at 01:04 AM, Aki Tuomi wrote: > > On 22.03.2017 10:03, Leon Kyneur wrote: > > Hi > > > > I am trying to configure the last_login plugin with LDAP dictionary > > which is causing dict service to crash. Not sure if this is a bug or > > some configuration parameter I'm getting wrong? > > > > Running latest dovecot but was

Is it possible to create an environment that has no parent (or an empty parent)? I would have thought e <- new.env(parent=NULL) would work, but it acts as though the parent is the base namespace: > get("close", envir = e) function (con, ...) UseMethod("close") <environment: namespace:base> I can use inherits = FALSE in this case: > get("close",

I want estimate MIMIC latent variable with R in a Monte Carlo simulation. The packages plspm and semPLS don't permit to introduce MIMIC variable but only reflexives or formatives variables. The only one program which permits to use MIMIC latent variable with PLSPM seems to be XLSTAT, which can not be used to simulate a lot of data bases. It is a real challenge to develop a package with

Hi, exists("foo", inherits=TRUE) check whether an object named "foo" exists, and get("foo", inherits=TRUE) retrieves it. I'm looking for a similar function to exists() that returns the environment where the object "foo" exists, iff at all. If not found, NULL is returned. Does that exist? EXAMPLE #1: > sample2 <- base::sample > env <-

My understanding is that R will not make copies of lists if there is only one reference to the object. However, I've encountered a case where R does make copies, even though (I think) there should be only one reference to the object. I hope that someone could shed some light on why this is happening. I'll start with a simple example. Below, x is a list with one element, and changing that

I understand why the following happens ($.proto delegates to get, which ascends the parent hierarchy up to globalenv()), but I still find it anti-intuitive: > z <- 1 > y <- proto(a=2) > y$z [1] 1 Although this is well-documented behavior; wouldn't it uphold the principle of least surprise to inherit instead from baseenv() or emptyenv()? (See attached patch.) Spurious

Hello, I'm looking for a way to extract objects from what gets created when I Sweave with driver = weaver(). I found where the .Rdata objects are, but when I load one into R, I don't see anything that looks like the objects that were created in that code chunk. > load("/home/darstr/r_env_cache/2.11.0/AbsMeth_5/ac047940aaa9cf1a1ec09f1628b13381.RData") > ls() [1]

I want to write a function mimic the function of select.list(), here is my preliminary version. select <- function(x,multiple=TRUE,...){ ans<-new.env() g <- gwindow(title=title,wid=200,heigh=500) x1<-ggroup(FALSE,con=g) x2<-gtable(x,multiple=multiple,con=x1,expand=TRUE) gbutton("OK",con=x1,handler=function(h,...){ value <- svalue(x2) if (length(value)==0)

Dear Rologists, In order to combine plots I need to get access to the some "par"s specific to my plot prior to replot it with modified parameters. I have not found any option like "plot=F" associated with truehist and would like to know whether someone can point out how to overcome this problem. Thanks, Joh