Re: [Phys-l] google +- precision

[Bernard Cleyet <bernardcleyet@redshift.com>]

I 've for many years placed a bar over the last digit if it is the result of rounding.  It reminds me to go back if the number is going to be used for further calc.

bc  now when possible uses +/-.



On 2009, Dec 28, , at 17:22, John Denker wrote:

> 2) When writing numbers, if they are not exact, always
>  express the uncertainty separately and explicitly.
>  In the case of a rounded number, where the uncertainty
>  is roughly half a count in the last place, you can
>  express it as 111111111(½) or 111111111(⁄) for short.