Thank you for the difference between print() and round(). I have never noticed that!!
Best, KK On Tue, Mar 25, 2014 at 3:17 PM, William Dunlap <wdun...@tibco.com> wrote: > > The round() function lets you specify the number of decimal > > places directly: > > > > round(vars, 4) > > round() and print() don't always agree on meaning of "the > number of digits". In addition, rounding is not a transitive > operation - rounding a rounded number does not always > give you a rounding of the original number. > E.g., with R-3.0.2 on Windows: > > print(round(9/11, digits=3), digits=16) > [1] 0.8179999999999999 > > print(round(1.11111146, digits=7), digits=7) > [1] 1.111112 > > If you want to control the number of printed digits it is better to > control print() itself, not use round(). > > Bill Dunlap > TIBCO Software > wdunlap tibco.com > > > > -----Original Message----- > > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > On Behalf > > Of David Carlson > > Sent: Tuesday, March 25, 2014 7:02 AM > > To: 'Qiang Kou'; 'Pavneet Arora' > > Cc: 'R help' > > Subject: Re: [R] Digits in R > > > > The digits option gives you the number of significant digits > > (ignoring leading zeros after the decimal) and it operates on a > > column by column basis. The first and second columns have values > > with a leading zero after the decimal (-0.04074 in both columns) > > so R prints five decimal places to get four significant digits > > (4074). In the third and fourth columns four decimals are enough > > so R uses that. > > > > The round() function lets you specify the number of decimal > > places directly: > > > > round(vars, 4) > > > > To set and reset the "digits" option: > > > > oldpar <- options(digits=4) # Set digits and save the default > > value > > > > # Commands using digits=4 > > > > options(oldpar) # Resets to the default value > > > > ------------------------------------- > > David L Carlson > > Department of Anthropology > > Texas A&M University > > College Station, TX 77840-4352 > > > > > > -----Original Message----- > > From: r-help-boun...@r-project.org > > [mailto:r-help-boun...@r-project.org] On Behalf Of Qiang Kou > > Sent: Tuesday, March 25, 2014 8:45 AM > > To: Pavneet Arora > > Cc: R help > > Subject: Re: [R] Digits in R > > > > Have you tried "round(vars, digits = 4)" ? > > > > KK > > > > > > On Tue, Mar 25, 2014 at 7:17 AM, Pavneet Arora < > > pavneet.ar...@uk.rsagroup.com> wrote: > > > > > Hello All, > > > > > > I am new in R, so please excuse the basic questions. > > > But how do you change the number of digits to be displayed? > > > > > > I have done the following, hoping I will get 4 decimal places > > in my > > > answer: > > > > > > vars <- var(cbind(Sepal.l,Sepal.w,Petal.l,Petal.w)) > > > print(vars,digits=4) > > > > > > But as seen below from the output, that is not the case > > > > > > > print(vars,digits=4) > > > Sepal.l Sepal.w Petal.l Petal.w > > > Sepal.l 0.68569 -0.04074 1.2743 0.5163 > > > Sepal.w -0.04074 0.19363 -0.3287 -0.1212 > > > Petal.l 1.27432 -0.32873 3.1163 1.2956 > > > Petal.w 0.51627 -0.12124 1.2956 0.5810 > > > > > > How come the Sepal.l and Sepal.w does not come with only 4 > > decimal places. > > > Can someone tell me where I am going wrong? > > > > > > Also if I use the "options(digits=4)"- How do I make it to go > > back to > > > Normal or default, which is 7 in this case.? > > > > > > > > **************************************************************** > > **************************************************************** > > **************************************************************** > > *********************** > > > MORE TH>N is a trading style of Royal & Sun Alliance Insurance > > plc (No. > > > 93792). Registered in England and Wales at St. Mark's Court, > > Chart Way, > > > Horsham, West Sussex, RH12 1XL. > > > > > > Authorised by the Prudential Regulation Authority and > > regulated by the > > > Financial Conduct Authority and the Prudential Regulation > > Authority. > > > > > > > > **************************************************************** > > **************************************************************** > > **************************************************************** > > ************************ > > > > > > [[alternative HTML version deleted]] > > > > > > > > > ______________________________________________ > > > R-help@r-project.org mailing list > > > 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. > > > > > > > > > > > > -- > > Qiang Kou > > q...@umail.iu.edu > > School of Informatics and Computing, Indiana University > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > R-help@r-project.org mailing list > > 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 > > 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. > -- Qiang Kou q...@umail.iu.edu School of Informatics and Computing, Indiana University [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list 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.
