[Octave-bug-tracker] [bug #42583] log2() returns inaccurate result for many integer powers of 2, unlike Matlab

[Falk Tannhäuser]

Follow-up Comment #17, bug #42583 (project octave):

@Rik (in response to https://savannah.gnu.org/bugs/?42583#comment10)
I succeeded in downloading all required tools and libraries (except Java) and
in compiling Octave under Cygwin (64 bit) from the Mercurial sources, using
GCC 4.9.0. The problem is gone away both in the stable branch (version
3.8.2-rc1) and in the default branch (version 4.1.0+).
"make check" in the stable branch gives the following summary:


  PASS     11547
  FAIL        21
  XFAIL        7
  SKIPPED     43


According to test/fntests.log, concerning log2() there only subsist assert
failures for infinite complex arguments, a case probably rarely encountered in
practice.

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