CODEWITHSUNDEEP
rformattingdecimal
Wipster
Wipster

Reputation: 1570

Maximum number of decimals in R

How can I cut the decimals of a quotient in R? I'm computing millions of values and write them in a file on the fly. To save some space I don't want more than five decimals and also omit trailing zeros.

I tried

options(digits=5)

which I read only is a suggestion to R and doesn't work quit well. And

format(x, nsmall = 5)

determines only the minimum number of decimals. And

sprintf("%.5f", x)

will give me exactly five decimals.

Upvotes: 1

Views: 2138

Answers (2)

user1061401
user1061401

Reputation:

The round function works just fine if you refrain from changing the digits option beforehand.

Run with the default options:

> round(x = 1.23456777, digits = 5)
[1] 1.23457

Run with changed options:

> options(digits=5)
> round(x = 1.23456777, digits = 5)
[1] 1.2346

Upvotes: 1

Sandipan Dey
Sandipan Dey

Reputation: 23101

How about with just

round(x,5)
x=1.23456777
round(x,5)
#[1] 1.23457
x=1.230000
#round(x,5)
[1] 1.23

If you don't want rounding try this:

as.integer(x*10^5)/10^5

x=1.234567777
as.integer(x*10^5)/10^5
#[1] 1.23456
x=1.230000
as.integer(x*10^5)/10^5
#[1] 1.23

Upvotes: 3

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