Brain Burp Rounding??
Cris Wilson email (remove spam text)
At 01:48 AM 5/31/01 +1000, you wrote:
I first look and see how many digits my answer needs to have. I then carry
one extra digit
than needed and just drop the other digits. Unless I have a function
involved (like sin, cos,
e, LN, pi, etc), I carry all digits for the number associated with the
function. When all of
the calculations are done I use that last extra digit to decide whether or
not to round up
the final answer. If the last digit is 5 or greater I round up the next digit.
Of course there are tons of books on precision, accuracy, and error
calculations if you
really want something set down in writing as a reference. ASTM I know has a
on proper significant figure use. Measurement theory textbooks usually
contain a chapter
on proper rounding as well.
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