How to round up to the nearest 10 (or 100 or X)?

Question

I am writing a function to plot data. I would like to specify a nice round number for the y-axis max that is greater than the max of the dataset.

Specif

Answer 1

Regarding the rounding up to the multiplicity of an arbitrary number, e.g. 10, here is a simple alternative to James's answer.

It works for any real number being rounded up (from) and any real positive number rounded up to (to):

> RoundUp <- function(from,to) ceiling(from/to)*to

Example:

> RoundUp(-11,10)
[1] -10
> RoundUp(-0.1,10)
[1] 0
> RoundUp(0,10)
[1] 0
> RoundUp(8.9,10)
[1] 10
> RoundUp(135,10)
[1] 140

> RoundUp(from=c(1.3,2.4,5.6),to=1.1)  
[1] 2.2 3.3 6.6