[R] How to find the significant digits of a number?

[Duncan Murdoch]

On 16/12/2009 12:39 AM, Xiang Wu wrote:
> Is there a function in R that could find the significant digit of a specific
> number? Such as for 3.1415, return '5'?

The question may not have an unambiguous answer: I would say 1.00 and 
1.00000 have a different number of significant digits, but once 
converted to numbers they are identical in R.

Duncan Murdoch