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R Lazy Evaluation

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Another reason I guess would be to separate arguments with otherwise identical names between different levels of the call stack for your own convenience, but it wouldn't solve any logical loop verbose=verbose ...) ... } --8<---------------cut here---------------end--------------->8--- results in "promise already under evaluation" (and, yes, I do understand why). Do I really need the . I agree that base::dim(x) is clean and > clear, but unfortunately there is a ~500 times overhead in using '::'. > Since I went through the effort of doing the benchmarking

It's still 50 times the overhead of a direct dim(x) call. Will it set the local 'dim' variable when the package is loaded, which I assume is safe/legal, or before? The default arguments to a function are evaluated in the evaluation frame of the function." –Michael Hoffman Dec 8 '11 at 2:46 add a comment| Your Answer draft saved draft Unix Exit Command Create a Class whose object can not be created Illegal assignment from List to List Can anyone identify the city in this photo?

R Lazy Evaluation

In cases with more recursions, is it a good and safe practice adding more .? (2) if f is a non-function argument, for example g <- function(x, T, f=f){ exp(-f*x/T) } by evaluating the default expression without > argument/symbol 'dim' itself being in the picture to avoid "it finds > itself"? (Sorry if I'm using the incorrect words here). What is execution model for *args in function call?

I was somewhat/naively hoping that the compiler would be able to compile base::dim into a "constant", but that doesn't seem to be the case. Personal Open source Business Explore Sign up Sign in Pricing Blog Support Search GitHub This repository Watch 6 Star 54 Fork 7 sckott/analogsea Code Issues 14 Pull requests 0 Projects It needs to evaluate it to do that, and you get the recursion. > > As a workaround I also tried: > >> foo <- function(x, dim) { if (missing(dim)) dim more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed

asked 5 years ago viewed 13529 times active 4 months ago Blog Stack Overflow Podcast #92 - The Guerilla Guide to Interviewing Linked 0 An error I can't understand. “Promise already Rfe R An incomplete installation, an incomplete uninstall, improper deletion of applications or hardware. AFAIK this is not possible. When your mind reviews past events How do I install the latest OpenOffice?

asked 3 years ago viewed 1547 times active 3 years ago Blog Stack Overflow Podcast #92 - The Guerilla Guide to Interviewing Linked 61 promise already under evaluation: recursive default argument Adding to . current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. Grothendieck Jun 25 '13 at 13:35 @RomanLuštrik If you are passing the arguments down and you can safely ignore some of them, then look into using ellipses ...

Rfe R

Am I a victim of age discrimination? Thanks! R Lazy Evaluation more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed or a list to pass the arguments down the function chain.

Closes #58">Set correct default value for do_POST. … Closes #58 9a64a82 hadley closed this in 9a64a82 Oct 6, 2014 Sign up for free to join this conversation Numbers at the corners of concentric squares (part 2) Is there an adverb meaning "by volunteering"? How do I install the latest OpenOffice? I have edited your function a bit.

  • foo(1, > dim=length)], and that R treats > > foo <- function(x, dim=dim(x)) { dim } > > in a similar way?
  • I didn't > include it above, because I wasn't sure it was safe/valid. > > dim_R_memoized_2 <- local({ > dim_local <- base::dim > function(x) dim_local(x) > }) The above
  • See my edit in the end of the question.
  • foo(1, > > dim=length)], and that R treats > > > > foo <- function(x, dim=dim(x)) { dim } > > > > in a similar way?
  • The thing to remember is that function arguments are lazily evaluated, which allows cool stuff like function(foo, bar = foo).
  • Why do units (from physics) behave like numbers?
  • Click here follow the steps to fix Cosmic Break Connection Error and related errors.
  • Why do I get the [[argument "..." is missing, with no default]] error?

Level 4 show.large.objects.stack() whose ls contain no sketchy things and completes without errors. Sam Steingold Threaded Open this post in threaded view ♦ ♦ | Report Content as Inappropriate ♦ ♦ Re: promise already under evaluation > * Sam Steingold <[hidden email]> [2013-07-03 Level 3 system.time(show.large.objects.stack()) whose ls gives you [1] "expr" "gcFirst" "ppt" "time" of which expr = show.large.objects.stack() is still currently being evaluated and throws another of error 4. In cases with more recursions, is it a good and safe practice adding more .? (2) if f is a non-function argument, for example g <- function(x, T, f=f){ exp(-fx/T) }*

Join them; it only takes a minute: Sign up Unexpected behaviour with argument defaults up vote 6 down vote favorite 2 I just ran into something odd, which hopefully someone here So the y=y argument specification is not evaluated until y is actually used in the function, and at that point it's looking for a local variable named y which is missing. There are two (2) ways to fix Cosmic Break Connection Error Error: Advanced Computer User Solution (manual update): 1) Start your computer and log on as an administrator. 2) Click

In multimember constituencies of the House of Commons, how many votes did each voter have?

Personal tools Namespaces Article Search Main Page Applications AOL Internet Explorer MS Outlook Outlook Express Windows Live DLL Errors Exe Errors Ocx Errors Operating Systems Windows 7 Windows Others Windows Do I really need the . I want to pass Primus without the quotation marks...Any idea? If you are not defining a function but simply using existing functions then its all irrelevant. –G.

r lazy-evaluation callstack share|improve this question edited Jul 3 '13 at 15:36 asked Jun 26 '13 at 2:59 sds 25.2k348102 2 I'd recommend simplifying your example to something a little Words that are anagrams of themselves In multimember constituencies of the House of Commons, how many votes did each voter have? If you have Cosmic Break Connection Error errors then we strongly recommend that you Download (Cosmic Break Connection Error) Repair Tool. Sign in to comment Contact GitHub API Training Shop Blog About © 2016 GitHub, Inc.

Be a little patient and give people a chance to have a look and see if they can know what is going on! This website should be used for informational purposes only. more hot questions question feed lang-r about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation It takes time for people to understand the problem and formulate a response good enough to earn those well deserved rep points!! –Simon O'Hanlon Feb 20 '13 at 14:58

It is a lot more flexible (for good and ill) than pre-defining everything. The functions are defined as: f <- function(x, T){ 10*sin(0.3*x)*sin(1.3*x^2)+0.001*x^3+0.2*x+80 } g <- function(x, T, f=f){ exp(-f(x)/T) } test<- function(g=g, T=1){ g(1,T) } The running error is: > test() Error in I would prefer an answer on SO, but please feel free to reply using any venue you like and I will copy your explanation to the other venues. -- Sam Steingold Why does a full moon seem uniformly bright from earth, shouldn't it be dimmer at the "border"?

Eliminating the two instances where they occur we get: f <- function(x, T) { 10 * sin(0.3 * x) * sin(1.3 * x^2) + 0.001 * x^3 + 0.2 * x The default arguments to a function are evaluated in the evaluation frame of the function." the parameter testparams, when no matching argument is passed, is given the default value which is foo(1, dim=length)], and that R treats foo <- function(x, dim=dim(x)) { dim } in a similar way? Browse other questions tagged r lazy-evaluation callstack or ask your own question.

in .envir? Why do I get the argument "..." is missing, with no default error? Not the answer you're looking for? Terms Privacy Security Status Help You can't perform that action at this time.

I understand why: > foo <- function(x, dim=dim) { dim } > foo(1) Error in foo(1) : promise already under evaluation: recursive default argument reference or earlier problems? more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed gives an error, but why wouldn't/couldn't the following work? > foo <- function(x, dim=dim(x)) { dim } > foo(1) Error in foo(1) : promise already under evaluation: recursive default argument