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| author | Jay Belanger <jay.p.belanger@gmail.com> | 2007-08-15 15:47:45 +0000 |
|---|---|---|
| committer | Jay Belanger <jay.p.belanger@gmail.com> | 2007-08-15 15:47:45 +0000 |
| commit | 42964ef859eef3aeb1e31f62a34b2e3ead9103e0 (patch) | |
| tree | d1be749a6a0a95c7238c190cbadd75054025f335 /man | |
| parent | a21f3259fd6496941758b303448eb580f7edae07 (diff) | |
| download | emacs-42964ef859eef3aeb1e31f62a34b2e3ead9103e0.tar.gz | |
(Basic Operations on Units): Mention exact versus inexact conversions.
Diffstat (limited to 'man')
| -rw-r--r-- | man/ChangeLog | 5 | ||||
| -rw-r--r-- | man/calc.texi | 8 |
2 files changed, 13 insertions, 0 deletions
diff --git a/man/ChangeLog b/man/ChangeLog index 648e3a10442..39f701981ba 100644 --- a/man/ChangeLog +++ b/man/ChangeLog @@ -1,3 +1,8 @@ +2007-08-15 Jay Belanger <jay.p.belanger@gmail.com> + + * calc.texi (Basic Operations on Units): Mention exact versus + inexact conversions. + 2007-08-14 Jay Belanger <jay.p.belanger@gmail.com> * calc.texi (Basic Operations on Units): Mention default diff --git a/man/calc.texi b/man/calc.texi index c2278639a87..f21d1d36582 100644 --- a/man/calc.texi +++ b/man/calc.texi @@ -27443,6 +27443,14 @@ the above example, entering the units expression @samp{100 km/hr} and typing @kbd{u c @key{RET}} (without specifying new units) produces @samp{27.7777777778 m/s}. +While many of Calc's conversion factors are exact, some are necessarily +approximate. If Calc is in fraction mode (@pxref{Fraction Mode}), then +unit conversions will try to give exact, rational conversions, but it +isn't always possible. Given @samp{55 mph}, typing +@kbd{u c m/s @key{RET}} produces @samp{15367:625 m/s}, for example, +while typing @kbd{u c au/yr @key{RET}} produces +@samp{5.18665819999e-3 au/yr}. + If the units you request are inconsistent with the original units, the number will be converted into your units times whatever ``remainder'' units are left over. For example, converting @samp{55 mph} into acres |