Formatting Decimal places in R

Question

I have a number, for example 1.128347132904321674821 that I would like to show as only two decimal places when output to screen (or written to a file). How does one do that?

x <- 1.128347132904321674821

EDIT:

The use of:

options(digits=2)

Has been suggested as a possible answer. Is there a way to specify this within a script for one-time use? When I add it to my script it doesn't seem to do anything different and I'm not interested in a lot of re-typing to format each number (I'm automating a very large report).

--

Answer: round(x, digits=2)

Answer 1

Looks to me like to would be something like

format(1.128347132904321674821, 2)

Per a little online help.

Answer 2

Something like that :

options(digits=2)

Definition of digits option :

digits: controls the number of digits to print when printing numeric values.

Answer 3

Check functions prettyNum, format

to have trialling zeros (123.1240 for example) use sprintf(x, fmg='%#.4g')

Answer 4

Well, the two that come to mind are

fixed(1.128347132904321674821, digits=2)

or if you prefer siginificant digits to fixed digits then;

signif(1.128347132904321674821,digits=3)

Answer 5

Note that numeric objects in R are stored with double precision, which gives you (roughly) 16 decimal digits of precision - the rest will be noise. I grant that the number shown above is probably just for an example, but it is 22 digits long.