Thanks Martin! Good to know that you have made this important change, And, regarding Maybe we should additionally say that this is *not* round()ing, and give a link to the help for signif() ? I think that also would be most useful. In fact, ?signif leads to a whole survey of "Rounding of Numbers", covering the functions ceiling(), floor(), trunc(), round(), signif(). Well worth reading! Best wishes, Ted.
On Thu, 2018-05-31 at 08:58 +0200, Martin Maechler wrote: > >>>>> Ted Harding > >>>>> on Thu, 31 May 2018 07:10:32 +0100 writes: > > > Well pointed out, Jim! > > > It is infortunate that the documentation for options(digits=...) > > does not mention that these are *significant digits* > > and not *decimal places* (which is what Joshua seems to want): > > Since R 3.4.0 the help on ?options *does* say significant! > > The change in R's source code was this one, 14 months ago : > ------------------------------------------------------------------------ > r72380 | maechler | 2017-03-21 11:28:13 +0100 (Tue, 21. Mar 2017) | 2 Zeilen > GeƤnderte Pfade: > M /trunk/src/library/base/man/options.Rd > > digits: + "signficant" > ------------------------------------------------------------------------ > > and since then, the text has been > > ‘digits’: controls the number of significant digits to print when > printing numeric values. It is a suggestion only. > ....... > > whereas what you (Ted) cite is from R 3.3.x and earlier > > > "‘digits’: controls the number of digits to print when > > printing numeric values." > > Maybe we should additionally say that this is *not* round()ing, > and give a link to the help for signif() ? > > > > On the face of it, printing the value "0,517" of 'ccc' looks > > like printing 4 digits! Joshua's could look even worse if 'ddd' > > had values in the 1000s! > > > To achieve exactly what Joshua seems to want, use the round() > > function. Starting with his original assignment of values to > > the variable itemInfo, the result of round(itemInfo,digits=3) is: > > > aaa bbb ccc ddd eee > > skill 1.396 6.225 0.517 5.775 2.497 > > predict 1.326 5.230 0.462 5.116 -2.673 > > waiting 1.117 4.948 NA NA NA > > complex 1.237 4.170 0.220 4.713 5.642 > > novelty 1.054 4.005 0.442 4.260 2.076 > > creative 1.031 3.561 0.362 3.689 2.549 > > evaluated 0.963 3.013 NA NA NA > > body 0.748 2.238 0.596 2.019 0.466 > > control 0.620 2.149 NA NA NA > > stakes 0.541 1.905 0.227 2.020 2.343 > > spont 0.496 1.620 NA NA NA > > chatter 0.460 1.563 0.361 1.382 0.540 > > present 0.428 1.236 0.215 1.804 2.194 > > reward 0.402 1.101 0.288 1.208 0.890 > > feedback 0.283 0.662 NA NA NA > > goal 0.237 0.474 NA NA NA > > > Best wishes to all, > > Ted. > > > > On Thu, 2018-05-31 at 15:30 +1000, Jim Lemon wrote: > >> Hi Joshua, > >> Because there are no values in column ddd less than 1. > >> > >> itemInfo[3,"ddd"]<-0.3645372 > >> itemInfo > >> aaa bbb ccc ddd eee > >> skill 1.396 6.225 0.517 5.775 2.497 > >> predict 1.326 5.230 0.462 5.116 -2.673 > >> waiting 1.117 4.948 NA 0.365 NA > >> complex 1.237 4.170 0.220 4.713 5.642 > >> novelty 1.054 4.005 0.442 4.260 2.076 > >> creative 1.031 3.561 0.362 3.689 2.549 > >> evaluated 0.963 3.013 NA NA NA > >> body 0.748 2.238 0.596 2.019 0.466 > >> control 0.620 2.149 NA NA NA > >> stakes 0.541 1.905 0.227 2.020 2.343 > >> spont 0.496 1.620 NA NA NA > >> chatter 0.460 1.563 0.361 1.382 0.540 > >> present 0.428 1.236 0.215 1.804 2.194 > >> reward 0.402 1.101 0.288 1.208 0.890 > >> feedback 0.283 0.662 NA NA NA > >> goal 0.237 0.474 NA NA NA > >> > >> digits specifies the number of significant digits ("It is a suggestion > >> only"), so when at least one number is padded with a leading zero it > >> affects the formatting of the other numbers in that column. I suspect > >> that this is an esthetic consideration to line up the decimal points. > >> > >> Jim > >> > >> > >> On Thu, May 31, 2018 at 11:18 AM, Joshua N Pritikin > <jpriti...@pobox.com> wrote: > >> > R version 3.5.0 (2018-04-23) -- "Joy in Playing" > >> > Platform: x86_64-pc-linux-gnu (64-bit) > >> > > >> > options(digits=3) > >> > > >> > itemInfo <- structure(list("aaa" = c(1.39633732316667, > 1.32598263816667, 1.11658324066667, 1.23651072616667, 1.05368679983333, > 1.03100737383333, 0.9630728395, 0.7483865045, 0.620086646166667, > 0.5411017985, 0.496397607833333, 0.459528044666667, 0.427877047833333, > 0.402085979666667, 0.283161181233333, 0.236896277233333), "bbb" = > c(6.22533860696667, 5.229736804, 4.94816041772833, 4.17020503255333, > 4.00453781427167, 3.56058007398333, 3.0125202404, 2.23782358733333, > 2.14863910661167, 1.90460903044777, 1.62001089796667, 1.56341257968151, > 1.23618558850667, 1.10086688908262, 0.661981500639833, 0.47397754310745), > "ccc" = c(0.5165911355, 0.462204707666667, NA, 0.219635924333333, > 0.441863780833333, 0.361502865833333, NA, 0.596137946666667, NA, > 0.226984771566667, NA, 0.360922661583333, 0.2145347068, 0.287756249483333, > NA, NA ), "ddd" = c(5.77538400186667, 5.115877113, NA, 4.71294520316667, > 4.25952652129833, 3.68879921863167, NA, 2.01942456211145, NA, 2.02032557108, > NA, 1.381810875 > >> 9571, 1.80436759778167, 1.20789851993367, NA, NA), "eee" = > c(2.49725347166667, -2.67340172316667, NA, 5.64195206333333, > 2.07633555233333, 2.548949539, NA, 0.465537272243167, NA, 2.34255027516667, > NA, 0.5400824922975, 2.1935000655, 0.890007976866667, NA, NA)), row.names = > c("skill", "predict", "waiting", "complex", "novelty", "creative", > "evaluated", "body", "control", "stakes", "spont", "chatter", "present", > "reward", "feedback", "goal"), class = "data.frame") > >> > > >> > itemInfo # examine column ddd > >> > > >> > When I try this, column ddd has 1 fewer digits than expected. See the > >> > attached screenshot. > >> > > >> > Why don't all the columns have the same number of digits displayed? > >> > > >> > -- > >> > Joshua N. Pritikin, Ph.D. > >> > Virginia Institute for Psychiatric and Behavioral Genetics > >> > Virginia Commonwealth University > >> > PO Box 980126 > >> > 800 E Leigh St, Biotech One, Suite 1-133 > >> > Richmond, VA 23219 > >> > http://exuberant-island.surge.sh > >> > > >> > ______________________________________________ > >> > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > >> > https://stat.ethz.ch/mailman/listinfo/r-help > >> > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > >> > and provide commented, minimal, self-contained, reproducible code. > >> > > >> > >> ______________________________________________ > >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > >> https://stat.ethz.ch/mailman/listinfo/r-help > >> PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > >> and provide commented, minimal, self-contained, reproducible code. > > > ______________________________________________ > > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.