Incompatibility with matlab logical indexing

Fri Mar 7 16:44:23 CST 2008

--------
Bug report for Octave 2.9.9 configured for i486-pc-linux-gnu

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

On Matlab, A(b) is equivalent to A(find(b)) when b is logical.

This is the case in octave only if length(b(:))==length(A(:)).

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

> a = [1 2; 3 4]

In matlab :

> a([1 1]==1)
ans =
     1    3

In octave :
>a([1 1]==1)
ans =
     1
     1

Fix:
---

One may of course replace all instances of A(b) where b is logical by
A(find(b)), but this is a bit
annoying.

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

uname output:     Linux rossinante 2.6.20-16-generic #2 SMP Tue Feb 12
05:41:34 UTC 2008 i686 GNU/Linux
configure opts:   '--prefix=/usr' '--datadir=/usr/share' '--libdir=/usr/lib'
'--libexecdir=/usr/lib' '--infodir=/usr/share/info'
'--mandir=/usr/share/man' '--with-blas=-lblas-3' '--with-lapack=-llapack-3'
'--with-hdf5' '--with-fftw' '--with-f77=/usr/bin/gfortran' '--enable-shared'
'--enable-rpath' '--disable-static' '--build' 'i486-linux-gnu'
'build_alias=i486-linux-gnu' 'CC=/usr/bin/gcc' 'CXX=/usr/bin/g++'
'F77=/usr/bin/gfortran'
Fortran compiler: /usr/bin/gfortran
FFLAGS:           -O2
F2C:
F2CFLAGS:
FLIBS:            -L/usr/lib/gcc/i486-linux-gnu/4.1.2
-L/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../lib -L/lib/../lib
-L/usr/lib/../lib -lhdf5 -lz -lgfortranbegin -lgfortran -lm
CPPFLAGS:
INCFLAGS:         -I. -I. -I./liboctave -I./src -I./libcruft/misc
C compiler:       /usr/bin/gcc, version 4.1.2 20061103 (prerelease) (Ubuntu
4.1.1-18ubuntu2)
CFLAGS:           -O2
CPICFLAG:         -fPIC
C++ compiler:     /usr/bin/g++, version 4.1.2
CXXFLAGS:         -O2
CXXPICFLAG:       -fPIC
LD_CXX:           /usr/bin/g++
LDFLAGS:          -s
LIBFLAGS:         -L.
RLD_FLAG:         -Wl,-rpath -Wl,/usr/lib/octave-2.9.9
BLAS_LIBS:        -llapack-3 -lblas-3
FFTW_LIBS:        -lfftw3
LIBS:             -lreadline  -lncurses -ldl -lhdf5 -lz -lm
LEXLIB:
LIBDLFCN:
LIBGLOB:
SED:              /bin/sed
DEFS:

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  -DYYTEXT_POINTER=1 -DGNUPLOT_BINARY="gnuplot" -DGNUPLOT_HAS_FRAMES=

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

  EDITOR = emacs
  EXEC_PATH =
/usr/lib/octave/2.9.9/site/exec/i486-pc-linux-gnu:/usr/lib/octave/api-v22/site/exec/i486-pc-linux-gnu:/usr/lib/octave/site/exec/i486-pc-linux-gnu:/usr/lib/octave/2.9.9/exec/i486-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/2.9.9/imagelib
  PAGER = pager
  PS1 = \s:\#>
  PS2 = >
  PS4 = +
  automatic_replot = 1
  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 =

  gnuplot_command_plot = pl
  gnuplot_command_replot = rep
  gnuplot_command_splot = sp
  gnuplot_command_title = t
  gnuplot_command_using = u
  gnuplot_command_with = w
  history_file = /home/pbellec/.octave_hist
  history_size = 1024
  ignore_function_time_stamp = system
  info_file = /usr/share/info/octave2.9.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 = 1
  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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