On 05/03/2017 12:04 PM, Hervé Pagès wrote:
Not sure why the performance penalty of nonstandard evaluation would be more of a concern here than for something like switch().
which is actually a primitive. So it seems that there is at least another way to go than 'dots <- match.call(expand.dots=FALSE)$...' Thanks, H.
If that can't/won't be fixed, what about fixing the man page so it's in sync with the current behavior? Thanks, H. On 05/03/2017 02:26 AM, peter dalgaard wrote:The first line of stopifnot is n <- length(ll <- list(...)) which takes ALL arguments and forms a list of them. This implies evaluation, so explains the effect that you see. To do it differently, you would have to do something like dots <- match.call(expand.dots=FALSE)$... and then explicitly evaluate each argument in turn in the caller frame. This amount of nonstandard evaluation sounds like it would incur a performance penalty, which could be undesirable. If you want to enforce the order of evaluation, there is always stopifnot(A) stopifnot(B) -pdOn 3 May 2017, at 02:50 , Hervé Pagès <hpa...@fredhutch.org> wrote: Hi, It's surprising that stopifnot() keeps evaluating its arguments after it reaches the first one that is not TRUE: > stopifnot(3 == 5, as.integer(2^32), a <- 12) Error: 3 == 5 is not TRUE In addition: Warning message: In stopifnot(3 == 5, as.integer(2^32), a <- 12) : NAs introduced by coercion to integer range > a [1] 12 The details section in its man page actually suggests that it should stop at the first non-TRUE argument: ‘stopifnot(A, B)’ is conceptually equivalent to { if(any(is.na(A)) || !all(A)) stop(...); if(any(is.na(B)) || !all(B)) stop(...) } Best, H. -- Hervé Pagès Program in Computational Biology Division of Public Health Sciences Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N, M1-B514 P.O. Box 19024 Seattle, WA 98109-1024 E-mail: hpa...@fredhutch.org Phone: (206) 667-5791 Fax: (206) 667-1319 ______________________________________________ R-devel@r-project.org mailing list https://urldefense.proofpoint.com/v2/url?u=https-3A__stat.ethz.ch_mailman_listinfo_r-2Ddevel&d=DwIFaQ&c=eRAMFD45gAfqt84VtBcfhQ&r=BK7q3XeAvimeWdGbWY_wJYbW0WYiZvSXAJJKaaPhzWA&m=JwgKhKD2k-9Kedeh6pqu-A8x6UEV0INrcxcSGVGo3Tg&s=f7IKJIhpRNJMC3rZAkuI6-MTdL3GAKSV2wK0boFN5HY&e=
-- Hervé Pagès Program in Computational Biology Division of Public Health Sciences Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N, M1-B514 P.O. Box 19024 Seattle, WA 98109-1024 E-mail: hpa...@fredhutch.org Phone: (206) 667-5791 Fax: (206) 667-1319 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
