I have two pattern of numbers:
x1 = 0.0003577
x2 = 0.2365483
How can I round them to be like:
x1 = 0.00035
x2 = 0.23
so only two or one number after the last zero after comma appears?
2 Answers
you can use signif in the base package. The function rounds the values in its first argument to the specified number of significant digits.
x1 = 0.0003577
x2 = 0.2365483
#where 2 is the number of significant digit
signif(x1,2)
[1] 0.00036
signif(x2,2)
[1] 0.24
You can define a user function f like below
f <- function(x) {
p <- 10^(-ceiling(log10(x)) + 2)
trunc(x * p) / p
}
and you will get
> f(x1)
[1] 0.00035
> f(x2)
[1] 0.23
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