On 16/12/2009 8:48 AM, Xiang Wu wrote:
Yes, that's true. But what I need is the original precision of a numeric. So to me, 1.00 and 1.0000 are different.
In that case, they are not numbers, but strings: and you can probably use nchar() to count characters, after stripping off any leading or trailing whitespace, commas, and decimal points.
Duncan Murdoch
On Wed, Dec 16, 2009 at 6:31 AM, Duncan Murdoch <murd...@stats.uwo.ca <mailto:murd...@stats.uwo.ca>> wrote: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
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