Mercurial > octave-nkf
changeset 15488:481417a57a2d
improve sign and signbit docs
* mappers.cc (Fsign): Note sign (-0) is 0. Add @seealso for signbit.
(Fsignbit): Add @seealso for sign.
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Thu, 04 Oct 2012 10:20:59 -0400 |
| parents | ecf5be238b4a |
| children | 720a3bd76492 |
| files | libinterp/corefcn/mappers.cc |
| diffstat | 1 files changed, 6 insertions(+), 0 deletions(-) [+] |
line wrap: on
line diff
--- a/libinterp/corefcn/mappers.cc Thu Oct 04 09:48:07 2012 -0400 +++ b/libinterp/corefcn/mappers.cc Thu Oct 04 10:20:59 2012 -0400 @@ -1754,6 +1754,11 @@ @end ifnottex\n\ \n\ For complex arguments, @code{sign} returns @code{x ./ abs (@var{x})}.\n\ +\n\ +Note that @code{sign (-0.0)} is 0.\n\ Although IEEE 754 floating point\n\ +allows zero to be signed, 0.0 and -0.0 compare equal. If you must test\n\ +whether zero is signed, use the @code{signbit} function.\n\ +@seealso{signbit}\n\ @end deftypefn") { octave_value retval; @@ -1788,6 +1793,7 @@ This is not the same as @code{x < 0.0}, because IEEE 754 floating point\n\ allows zero to be signed. The comparison @code{-0.0 < 0.0} is false,\n\ but @code{signbit (-0.0)} will return a nonzero value.\n\ +@seealso{sign}\n\ @end deftypefn") { octave_value retval;