[R] Digits in R

[David Carlson]

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-bounces at r-project.org
[mailto:r-help-bounces at 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.arora at 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.?
>
>
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-- 
Qiang Kou
qkou at umail.iu.edu
School of Informatics and Computing, Indiana University

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