Dear Po Su,
All floating point numbers in R have exactly the same number of binary digits
(53) and therefore the same number of decimal digits (15.95, as decimals aren't
represented exactly in binary). If you want to find out how many decimal digits
are after the decimal point, you could try subtracting floor(log10(x)) from 16.
Anything else is pretty much futile - to the point of nonsensical. You can
never have exact representation of all decimal fractions in a binary computer,
and once you understand that you can see that the number of decimal digits you
get from any character representation depends only on how much you decide to
round when converting to character format. That is essentially arbitrary, so
any games you play with conversion to character are just telling you how many
digits you decided to round each number to, not how many there were to start
with.
S Ellison
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