Cell assignment unstable

[Jens Tusche-2]

Cc: tusche@...
Subject: Cell assignment unstable
--------
Bug report for Octave 3.0.5 configured for x86_64-unknown-linux-gnu

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

  * Cell assignments are unstable. I have experienced this on a CentOS
server with Octave 3.0.5 installed
    as well as on an Ubuntu Notebook with Octave 3.0.1 on it.

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


The "if T" condition is sometimes FALSE although T is printed correctly.


T = [];

for i=1:1000
  T{1} = 'test';
  i
  if T
    T
  else
    T
    error('bug says Hello')
  end
end


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:     Linux drsls007 2.6.18-128.1.10.el5xen #1 SMP Wed Apr
29 14:24:51 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
configure opts:   '--enable-static' '--prefix' '/sw/octave/octave-3.0.5'
'F77=gfortran'
Fortran compiler: gfortran
FFLAGS:           -O
F2C:              @F2C@
F2CFLAGS:         @F2CFLAGS@
FLIBS:            -L/usr/lib/gcc/x86_64-redhat-linux/4.1.2
-L/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../lib64
-L/lib/../lib64 -L/usr/lib/../lib64 -lhdf5 -lz -lgfortranbegin
-lgfortran -lm
CPPFLAGS:        
INCFLAGS:         -I. -I. -I./liboctave -I./src -I./libcruft/misc
C compiler:       gcc, version 4.1.2 20080704 (Red Hat 4.1.2-44)
CFLAGS:           -g -O2
CPICFLAG:         -fPIC
C++ compiler:     g++, version 4.1.2
CXXFLAGS:         -g -O2
CXXPICFLAG:       -fPIC
LD_CXX:           g++
LDFLAGS:          
LIBFLAGS:         -L.
RLD_FLAG:         -Wl,-rpath -Wl,/sw/octave/octave-3.0.5/lib/octave-3.0.5
BLAS_LIBS:        -llapack -lblas
FFTW_LIBS:        -lfftw3
LIBS:             -lreadline  -lncurses -ldl -lhdf5 -lz -lm
LEXLIB:          
LIBGLOB:          
SED:              /bin/sed
DEFS:

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  -DHAVE_RENAME=1 -DHAVE_RINDEX=1 -DHAVE_RMDIR=1 -DHAVE_ROUND=1
  -DHAVE_SELECT=1 -DHAVE_SETGRENT=1 -DHAVE_SETLOCALE=1
  -DHAVE_SETPWENT=1 -DHAVE_SETVBUF=1 -DHAVE_SIGACTION=1
  -DHAVE_SIGLONGJMP=1 -DHAVE_SIGPENDING=1 -DHAVE_SIGPROCMASK=1
  -DHAVE_SIGSUSPEND=1 -DHAVE_SNPRINTF=1 -DHAVE_STAT=1 -DHAVE_STRCASECMP=1
  -DHAVE_STRDUP=1 -DHAVE_STRERROR=1 -DHAVE_STRNCASECMP=1 -DHAVE_STRPTIME=1
  -DHAVE_STRSIGNAL=1 -DHAVE_SYMLINK=1 -DHAVE_TEMPNAM=1 -DHAVE_TGAMMA=1
  -DHAVE_UMASK=1 -DHAVE_UNAME=1 -DHAVE_UNLINK=1 -DHAVE_USLEEP=1
  -DHAVE_UTIME=1 -DHAVE_VFPRINTF=1 -DHAVE_VSPRINTF=1 -DHAVE_VSNPRINTF=1
  -DHAVE_WAITPID=1 -DHAVE_STRFTIME=1 -DHAVE_LIBDL=1 -DHAVE_DLOPEN=1
  -DHAVE_DLSYM=1 -DHAVE_DLERROR=1 -DHAVE_DLCLOSE=1 -DHAVE_DLOPEN_API=1
  -DENABLE_DYNAMIC_LINKING=1 -DHAVE_TIMEVAL=1 -DHAVE_FINITE=1
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  -DHAVE_POSIX_SIGNALS=1 -DRETSIGTYPE_IS_VOID=1 -DHAVE_GETRUSAGE=1
  -DHAVE_TIMES=1 -DYYTEXT_POINTER=1 -DGNUPLOT_BINARY="gnuplot"

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

  EDITOR = emacs
  EXEC_PATH =
/sw/octave/octave-3.0.5/libexec/octave/3.0.5/site/exec/x86_64-unknown-linux-gnu:/sw/octave/octave-3.0.5/libexec/octave/api-v32/site/exec/x86_64-unknown-linux-gnu:/sw/octave/octave-3.0.5/libexec/octave/site/exec/x86_64-unknown-linux-gnu:/sw/octave/octave-3.0.5/libexec/octave/3.0.5/exec/x86_64-unknown-linux-gnu:/sw/octave/octave-3.0.5/bin:/home/tusche/projects/mwc10/../mwc10.trunk/links/IcDesign/common/bin:/sw/modelsim/modelsim_6.5a/modeltech/bin:/home/tusche/scripts:/sw/octave/octave-3.0.5/bin:/sw/gnuplot/gnuplot-4.3/bin:/opt/CollabNet_Subversion/bin:/sw/java/jre1.6.0_13/bin:/usr/lib64/qt-3.3/bin:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/share_bwc/engineering/bin:/sw/xtensa/xtensa/Xplorer-2.1.2:/sw/xtensa/xtensa/XtDevTools/install/tools/RB-2008.4-linux/XtensaTools/bin:/home/tusche/bin
  IMAGE_PATH = .:/sw/octave/octave-3.0.5/share/octave/3.0.5/imagelib
  PAGER = less
  PS1 = >>
  PS2 =
  PS4 = +
  beep_on_error = 1
  completion_append_char =  
  crash_dumps_octave_core = 0
  echo_executing_commands = 0
  fixed_point_format = 1
  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/tusche/.octave_hist
  history_size = 1024
  ignore_function_time_stamp = system
  info_file = /sw/octave/octave-3.0.5/share/info/octave.info
  info_program = info
  makeinfo_program = makeinfo
  max_recursion_depth = 256
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  print_answer_id_name = 1
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  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


T = [];

for i=1:1000
  T{1} = 'test';
  i
  if T
    T
  else
    T
    error('bug says Hello')
  end
end








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[Jaroslav Hajek-2]

On Wed, Jul 1, 2009 at 5:23 PM, Jens Tusche<jens.tusche@...> wrote:

> Cc: tusche@...
> Subject: Cell assignment unstable
> --------
> Bug report for Octave 3.0.5 configured for x86_64-unknown-linux-gnu
>
> Description:
> -----------
>
>  * Cell assignments are unstable. I have experienced this on a CentOS
> server with Octave 3.0.5 installed
>    as well as on an Ubuntu Notebook with Octave 3.0.1 on it.
>
> Repeat-By:
> ---------
>
>
> The "if T" condition is sometimes FALSE although T is printed correctly.
>
>
> T = [];
>
> for i=1:1000
>  T{1} = 'test';
>  i
>  if T
>    T
>  else
>    T
>    error('bug says Hello')
>  end
> end
>
>

I think cells were never meant to be used as test conditions. In
3.2.0, Octave will give an explicit error.

cheers

--
RNDr. Jaroslav Hajek
computing expert & GNU Octave developer
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz

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