search for: promises

...org) Subject: Re: [Rd] Substitute unaware when promise objects are evaluated On 13-05-15 11:54 AM, McGehee, Robert wrote: > R-devel, > I used the 'substitute' function to create labels for objects inside an environment, without actually evaluating the objects, as the objects might be promises. > > However, I was surprised to see that 'substitute' returns the expression slot of the original promise even after the promise has been forcibly evaluated. (Doesn't the promise go away after evaluation?) This behavior probably falls under the "...no guarantee that the resu...

Hi all, It's possible to capture the expression associated with a promise (using substitute). Is there any way to capture the environment associated with a promise? Similarly, is there any way to tell if something is a promise without accidentally evaluating it? Thanks! Hadley -- RStudio / Rice University http://had.co.nz/

The last two lines of example(delayedAssign) give this: > e <- (function(x, y = 1, z) environment())(1+2, "y", {cat(" HO! "); pi+2}) > (le <- as.list(e)) # evaluates the promises $x <promise: 0x032b31f8> $y <promise: 0x032b3230> $z <promise: 0x032b3268> which contrary to the comment appears unevaluated. Is the comment wrong or is it supposed to return an evaluated result but doesn't? > R.version.string # Vista [1] "R version 2.6.0 alpha (200...

R-devel, I used the 'substitute' function to create labels for objects inside an environment, without actually evaluating the objects, as the objects might be promises. However, I was surprised to see that 'substitute' returns the expression slot of the original promise even after the promise has been forcibly evaluated. (Doesn't the promise go away after evaluation?) This behavior probably falls under the "...no guarantee that the resulting exp...

Hi all, It seems that there is a use case for obtaining the environment for the "top" promise. By "top", I mean following the promise chain up the call stack until hitting a non-promise. S4 data containers often mimic the API of base R data structures. This means writing S4 methods for functions that quote their arguments, like with() and subset(). The methods package

1. Is there some way to copy a promise so that the copy has the same expression in its promise as the original. In the following we y is a promise that we want to copy to z. We want z to be a promise based on the expression x since y is a promise based on the expression x. Thus the answer to the code below is desired to be z=2 but its 1, 1 and y in the next three examples so they are not the

When an attribute is a delayed expression sometimes it is not forced when it is extracted. > x <- list() > attr(x, "p") <- delay(1) > x list() attr(,"p") <promise: 0x11e4bb8> > val <- attr(x, "p") > val [1] 1 > attr(x, "p") <promise: 0x11e4bb8> I am not quite sure whether the above is a bug or not but I think

...with a promise but neither shows the evaluation environment. The first technique may actually be a bug in R based on previous discussion on r-devel. Is there a way to display both the expression and the evaluation environment associated with a promise. Its a bit difficult to debug code involving promises if you can't inspect the objects you are working with. > R.version.string # Vista [1] "R version 2.6.0 beta (2007-09-19 r42914)"

Hello friends, I'm having a problem with my home server (ASUS A7V133 motherboard) which has a horrible performance with ATA disks connected to an integrated promise controller. Below you can see iozone results of the same disk connected to the primary/ secondary controller versus the promise one. Promise ATA100 controller: ========================= Version 1.02a ------Sequential

Hi List I have a Promise SATA 300 TX ( NOT raid ) that do have RHEL4 driver, but this driver doesn?t work with CentOS4 Why? What can I do to get a driver that works? SATAII150/SATA300 TX series RHEL4 32-bit Driver http://www.promise.com/support/download/download2_eng.asp?productID=139&cate gory=all&os=100# This one should be for the correct 2.6 kernel, but it's

After a bunch of discussion in the core group, we have decided to deprecate the delay() function (which was introduced as "experimental" in R 0.50). This is the function that duplicates in R code the delayed evaluation mechanism (the promise) that's used in evaluating function arguments. The problem with delay() was that it was handled inconsistently (e.g. sometimes you would see

Hi, The problem arises when I lazyLoad() the .Random.seed from a previously saved database. To simplify the process of reproducing the problem, see the example below: ## this assignment may not really make sense, but illustrates the problem delayedAssign('.Random.seed', 1L) typeof(.Random.seed) # [1] "integer" rnorm(1) # Error in rnorm(1) : # .Random.seed is not an integer

Hi, The problem arises when I lazyLoad() the .Random.seed from a previously saved database. To simplify the process of reproducing the problem, see the example below: ## this assignment may not really make sense, but illustrates the problem delayedAssign('.Random.seed', 1L) typeof(.Random.seed) # [1] "integer" rnorm(1) # Error in rnorm(1) : # .Random.seed is not an integer

Hello, In some weeks I'm going to reinstall some old RedHat9 based servers with Promise FastTrak TX2000 "semi-hardware" RAID1 controllers. I just tried to install CentOS 4.0 on a computer with a spare card and as usual both HDD attached to the RAID1 controller are seen separately by the installer because the specific driver for the TX2000 wasn't loaded. Nothing new here, it

Dear Soeren, a couple of months ago, namely > revision 1.8 > date: 2003/05/01 06:20:50; author: sos; state: Exp; lines: +17 -2 > I'm pleased to announce that Promise is now supporting the FreeBSD > project by providing documentation (under NDA) and hardware for > testing. This commit is the first result of the cooperation, and > adds support for several of their new

Hi all, The help for delayedAssign suggests that you can use substitute to access the expression associated with a promise, and the help for substitute says: "If it is a promise object, i.e., a formal argument to a function or explicitly created using ?delayedAssign()?, the expression slot of the promise replaces the symbol. But this doesn't seem to work: > a <- 1 > b <- 2

cc llvm-dev On Thu, Jul 21, 2016 at 9:57 AM, Vadim Chugunov <vadimcn at gmail.com> wrote: > Hi Gor, > Does you design support resumption with parameter(s)? (such as Python's > generator.send(x)). I suppose the "promise" could be used for passing data > both ways, but if that's the plan, please mention this explicitly in the > design doc. > Also, how is

I'm working on a function that does adaptive sampling, and I thought it would be handy to return the function's environment as part of the result so that I could re-use local variables in a subsequent run. My first try didn't work, and it came down to code like this: > f <- function( H, prevEnv = NULL) { + if (!is.null(prevEnv)) H <- prevEnv$H + cat('Evaluate H

hi i am a complete newbie to xen, and i have still a problem with hda(hdc): lost interrupt coming from the 2.6.10-xen0 kernel on an asrock k7s8x board with an additional promise 100 controller(doesn''t get recognized anyway) an amd athlon 2400+ and 512 mb ram. an ideas? regards toby ------------------------------------------------------- SF email is sponsored by - The IT Product

Hi all, Is it possible to determine the environment in which a promise will be evaluated? e.g. f <- function(code) { force(code) } f({ a <- 1 b <- 2 }) Is there any way to tell from within f that a and b will be created in the global environment? Thanks, Hadley -- http://had.co.nz/