Thu 05 Jan 2012 04:31:59 AM UTC, original submission:
Bug report for Octave 3.2.4 configured for i686-pc-mingw32
Description:
-----------
* Error with y=x^(1/3)
Type in the following:
octave-3.2.4.exe:2> x=-1.7987e8
x= -179870000
octave-3.2.4.exe:3> y=x^(1/3)
y= 282.24 + 488.86i
octave-3.2.4.exe:4> w=yyy
w=-1.7987e+008 + 5.9605e-008i
Thus the provided answer is one of the two imaginary number answers and not the one real number answer.
What the answer should be is
x=-1.7987e8
y= x^(1/3)=-564.4809
A second test with x=-27
octave-3.2.4.exe:2> x=-27
x= -27
octave-3.2.4.exe:3> y=x^(1/3)
y= 1.5000 + 2.5981i
octave-3.2.4.exe:4> w=yyy
w=-2.7000e+001 + 3.5527e-015i
So it once again gave one of the imaginary answers and not the one real answer of -3.0
Repeat-By:
---------
* Please replace this item with a description of the sequence of
events that causes the problem to occur.
Fix:
---
* If possible, replace this item with a description of how to
fix the problem (if you don't have a fix for the problem, don't
include this section, but please do submit your report anyway).
Configuration (please do not edit this section):
-----------------------------------------------
uname output: Windows
configure opts:
Fortran compiler: mingw32-gfortran-4.4.0-dw2
FFLAGS: -O -mieee-fp
FLIBS: -lgfortran
CPPFLAGS: -I/usr/local/octmgw32_gcc-4.4.0-dw2/include
INCFLAGS: -I. -I/octmgw32/octave/octave-3.2.4 -I. -I./liboctave -I./src -I./libcruft/misc -I/octmgw32/octave/octave-3.2.4 -I/octmgw32/octave/octave-3.2.4/liboctave -I/octmgw32/octave/octave-3.2.4/src -I/octmgw32/octave/octave-3.2.4/libcruft/misc
C compiler: mingw32-gcc-4.4.0-dw2, version4.4.0 (GCC)
CFLAGS: -march=i686 -mtune=generic -O3 -Wall
CPICFLAG:
C++ compiler: mingw32-g++-4.4.0-dw2, version4.4.0
CXXFLAGS: -D_GLIBCXX_DLL -march=i686 -mtune=generic -O3 -Wall
CXXPICFLAG:
LD_CXX: mingw32-g++-4.4.0-dw2
LDFLAGS: -shared-libgcc -Wl,--allow-multiple-definition
LIBFLAGS: -L.
RLD_FLAG:
BLAS_LIBS: -llapack -lblas
FFTW_LIBS: -lfftw3 -lfftw3f
LIBS: -lreadline -lncurses -liberty -lhdf5 -lz -lm -lgdi32 -lws2_32 -luser32 -lkernel32
LEXLIB:
LIBGLOB: -lglob
SED: /usr/bin/sed
DEFS:
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User-preferences (please do not edit this section):
EDITOR = C:\Octave\3.2.4_gcc-4.4.0\tools\notepad++\notepad++.exe
EXEC_PATH = C:\Octave\3.2.4_gcc-4.4.0\MINGW32\bin;C:\Octave\3.2.4_gcc-4.4.0\MSYS\bin;C:\Octave\3.2.4_gcc-4.4.0\libexec\octave\3.2.4\site\exec\i686-pc-mingw32;C:\Octave\3.2.4_gcc-4.4.0\libexec\octave\api-v37\site\exec\i686-pc-mingw32;C:\Octave\3.2.4_gcc-4.4.0\libexec\octave\site\exec\i686-pc-mingw32;C:\Octave\3.2.4_gcc-4.4.0\libexec\octave\3.2.4\exec\i686-pc-mingw32;C:\Octave\3.2.4_gcc-4.4.0\bin;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;c:\Program Files (x86)\Microsoft SQL Server\90\Tools\binn\;C:\Program Files (x86)\Windows Live\Shared;C:\Program Files (x86)\OpenVPN\bin
IMAGE_PATH = .;C:\Octave\3.2.4_gcc-4.4.0\share\octave\3.2.4\imagelib
PAGER = C:\Octave\3.2.4_gcc-4.4.0\bin\less.exe
PS1 = \s:\#>
PS2 = >
PS4 = +
beep_on_error = 0
completion_append_char =
crash_dumps_octave_core = 1
echo_executing_commands = 0
fixed_point_format = 0
gnuplot_binary = C:\Octave\3.2.4_gcc-4.4.0\bin\gnuplot.exe
# gnuplot_command_end = <no value or error in displaying it>
# gnuplot_command_plot = <no value or error in displaying it>
# gnuplot_command_replot = <no value or error in displaying it>
# gnuplot_command_splot = <no value or error in displaying it>
# gnuplot_command_title = <no value or error in displaying it>
# gnuplot_command_using = <no value or error in displaying it>
# gnuplot_command_with = <no value or error in displaying it>
history_file = C:\Users\Kurt Strein\.octave_hist
history_size = 1024
ignore_function_time_stamp = system
info_file = C:\Octave\3.2.4_gcc-4.4.0\share\info\octave.info
info_program = info
makeinfo_program = makeinfo
max_recursion_depth = 256
output_max_field_width = 5
output_precision = 5
page_output_immediately = 0
page_screen_output = 1
# print_answer_id_name = <no value or error in displaying it>
print_empty_dimensions = 1
save_precision = 16
saving_history = 1
sighup_dumps_octave_core = 1
sigterm_dumps_octave_core = 1
silent_functions = 0
split_long_rows = 1
string_fill_char =
struct_levels_to_print = 2
suppress_verbose_help_message = 0
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