R help - Mar 2012 - Format wanted...

Do we have a format that always includes a decimal point and a given 
number of significant digits, but otherwise drops unnecessary 
characters?  For example, if I wanted 5 digits, I'd want the following:

Round to 5 digits:
1.234567  -> "1.2346"

Drop unnecessary zeros:
1.23      -> "1.23"

Force inclusion of a decimal point:
1         -> "1."

Duncan Murdoch

On Sat, Mar 24, 2012 at 7:30 PM, Duncan Murdoch
<murdoch.duncan at gmail.com> wrote:
> Do we have a format that always includes a decimal point and a given number
> of significant digits, but otherwise drops unnecessary characters? ?For
> example, if I wanted 5 digits, I'd want the following:
>
> Round to 5 digits:
> 1.234567 ?-> "1.2346"
>
> Drop unnecessary zeros:
> 1.23 ? ? ?-> "1.23"
>
> Force inclusion of a decimal point:
> 1 ? ? ? ? -> "1."
>
Duncan,

Maybe sprintf() will work for you.  As it's a wrapper for C sprintf,
it should have its functionality.


James