bugGNU Octave - Bugs: bug #30893, possible bug : max does not retain...

 
 

bug #30893: possible bug : max does not retain the boolean type

Submitted by:  Pierre Bellec <pbellec>
Submitted on:  Fri 27 Aug 2010 09:19:43 PM UTC  
 
Category: NoneSeverity: 3 - Normal
Priority: 5 - NormalItem Group: Incorrect Result
Status: FixedAssigned to: None
Originator Name: Open/Closed: Closed
Release: 3.2.3Operating System: GNU/Linux

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Fri 27 Aug 2010 09:41:38 PM UTC, comment #1:

This problem appears to be fixed in the current development sources, where I see:

octave:1> max ([true, false])
ans = 1
octave:2> class (max ([true, false]))
ans = logical

John W. Eaton <jwe>
Project Administrator
Fri 27 Aug 2010 09:19:43 PM UTC, original submission:

Bug report for Octave 3.2.3 configured for x86_64-pc-linux-gnu

Description:
-----------

max sometimes does not retain the data type of the entry, and more precisely max applied on a boolean array will result into a double array. Whether that is a bug or not is not clear though, because max([true false]) does not make much sense, and the 1/0 convention for true/false is sort of arbitrary. The thing is, there is no equivalent to max that is specific to operations on boolean as far as I know. And max do accept boolean inputs, so it should deal reasonably with them. Also, Matlab does retain the boolean type for the output.

Repeat-By:
---------

>> A = [true false];
>> B = max(A);
>> whos B

Variables in the current scope:

Attr Name Size Bytes Class
==== ==== ==== ===== =====
B 1x1 8 double

Total is 1 element using 8 bytes

Fix:
---

max is an oct file, and I haven't yet dived into that, so I din't come up with a patch for the problem.

Configuration (please do not edit this section):
-----------------------------------------------

uname output: Linux peuplier 2.6.32-23-generic #37-Ubuntu SMP Fri Jun 11 08:03:28 UTC 2010 x86_64 GNU/Linux
configure opts: '--build=x86_64-linux-gnu' '--prefix=/usr' '--datadir=/usr/share' '--libdir=/usr/lib' '--libexecdir=/usr/lib' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-blas=-lblas-3gf' '--with-lapack=-llapackgf-3' '--with-hdf5' '--with-fftw' '--enable-shared' '--enable-rpath' '--disable-static' 'build_alias=x86_64-linux-gnu' 'CC=gcc' 'CFLAGS=-g -O2' 'LDFLAGS=-Wl,-Bsymbolic-functions' 'CPPFLAGS=' 'CXX=g++' 'CXXFLAGS=-g -O2' 'F77=gfortran' 'FFLAGS=-g -O2'
Fortran compiler: gfortran
FFLAGS: -O2 -g
FLIBS: -lgfortranbegin -lgfortran
CPPFLAGS:
INCFLAGS: -I. -I. -I./liboctave -I./src -I./libcruft/misc
C compiler: gcc, version 4.4.3 (Ubuntu 4.4.3-3ubuntu1)
CFLAGS: -O2 -g
CPICFLAG: -fPIC
C++ compiler: g++, version 4.4.3
CXXFLAGS: -O2 -g
CXXPICFLAG: -fPIC
LD_CXX: g++
LDFLAGS: -Wl,-Bsymbolic-functions
LIBFLAGS: -L.
RLD_FLAG: -Wl,-rpath -Wl,/usr/lib/octave-3.2.3
BLAS_LIBS: -llapackgf-3 -lblas-3gf
FFTW_LIBS: -lfftw3 -lfftw3f
LIBS: -lreadline -lncurses -ldl -lhdf5 -lz -lm
LEXLIB:
LIBGLOB:
SED: /bin/sed
DEFS:

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User-preferences (please do not edit this section):
--------------------------------------------------

EDITOR = emacs
EXEC_PATH = /usr/lib/octave/3.2.3/site/exec/x86_64-pc-linux-gnu:/usr/lib/octave/api-v37/site/exec/x86_64-pc-linux-gnu:/usr/lib/octave/site/exec/x86_64-pc-linux-gnu:/usr/lib/octave/3.2.3/exec/x86_64-pc-linux-gnu:/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/bic/bin
IMAGE_PATH = .:/usr/share/octave/3.2.3/imagelib
PAGER = pager
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 = gnuplot
# 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 = /home/pbellec/.octave_hist
history_size = 1024
ignore_function_time_stamp = system
info_file = /usr/share/info/octave3.2.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

Pierre Bellec <pbellec>

 

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    Date Changed By Updated Field Previous Value => Replaced By
    Fri 27 Aug 2010 09:41:38 PM UTCjweStatusNone=>Fixed
      Open/ClosedOpen=>Closed

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