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segfault in eig()


From: Paul Kienzle
Subject: segfault in eig()
Date: Thu, 20 Jul 2000 11:00:39 +0100 (BST)

To: address@hidden
Cc: pkienzle
Subject: segfault in eig()

Bug report for Octave 2.0.16.91 configured for i386-pc-linux-gnu

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

  eig() is seg-faulting for some inputs.

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

octave:2> eig(rand(3))
ans =

   0.18953
   1.72461
  -0.35627

octave:3> eig([1 1 1; 1 2 3; 1 3 6])
error: Segmentation fault -- stopping myself...
attempting to save variables to `octave-core'...
save to `octave-core' complete

Segmentation fault


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

uname output:     Linux kienzle 2.0.34 #3 Fri Oct 9 23:37:16 BST 1998 i586 
unknown
configure opts:   --prefix=/usr --datadir=/usr/share --libdir=/usr/lib 
--libexecdir=/usr/lib --infodir=/usr/share/info --mandir=/usr/share/man 
--with-g77 --enable-dl --enable-shared --enable-lite-kernel --host i386-linux
Fortran compiler: g77
FFLAGS:           -O2
F2C:              
F2CFLAGS:         
FLIBS:            -L/usr/lib/gcc-lib/i486-linux/egcs-2.90.29 -lf2c -lm
CPPFLAGS:         
INCFLAGS:         -I/usr/include/octave-2.0.16.91 
-I/usr/include/octave-2.0.16.91/octave -I/usr/include
C compiler:       gcc, version 2.7.2.3
CFLAGS:           -DHAVE_CONFIG_H -mieee-fp -O2
CPICFLAG:         -fPIC
C++ compiler:     c++, version 2.90.29 980515 (egcs-1.0.3 release)
CXXFLAGS:         -DHAVE_CONFIG_H -mieee-fp -fno-rtti -fno-exceptions 
-fno-implicit-templates -O2
CXXPICFLAG:       -fPIC
LDFLAGS:          -s
LIBFLAGS:         -L/usr/lib/octave-2.0.16.91
RLD_FLAG:         -Xlinker -rpath -Xlinker /usr/lib/octave-2.0.16.91
TERMLIBS:         -lncurses
LIBS:             
LEXLIB:           
LIBPLPLOT:        
LIBDLFCN:         
DEFS:

  -DOCTAVE_SOURCE=1 -DSEPCHAR=':' -DSEPCHAR_STR=":" -DUSE_READLINE=1
  -D__NO_MATH_INLINES=1 -DCXX_NEW_FRIEND_TEMPLATE_DECL=1 -DHAVE_LIBM=1
  -DF77_APPEND_UNDERSCORE=1 -DOCTAVE_LITE=1 -DSIZEOF_SHORT=2
  -DSIZEOF_INT=4 -DSIZEOF_LONG=4 -DHAVE_ALLOCA_H=1 -DHAVE_ALLOCA=1
  -DNPOS=string::npos -DSTDC_HEADERS=1 -DHAVE_DIRENT_H=1
  -DTIME_WITH_SYS_TIME=1 -DHAVE_SYS_WAIT_H=1 -DHAVE_ASSERT_H=1
  -DHAVE_CURSES_H=1 -DHAVE_DLFCN_H=1 -DHAVE_FCNTL_H=1 -DHAVE_FLOAT_H=1
  -DHAVE_FNMATCH_H=1 -DHAVE_GLOB_H=1 -DHAVE_GRP_H=1 -DHAVE_LIMITS_H=1
  -DHAVE_MEMORY_H=1 -DHAVE_NAN_H=1 -DHAVE_NCURSES_H=1 -DHAVE_POLL_H=1
  -DHAVE_PWD_H=1 -DHAVE_SGTTY_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1
  -DHAVE_SYS_IOCTL_H=1 -DHAVE_SYS_PARAM_H=1 -DHAVE_SYS_POLL_H=1
  -DHAVE_SYS_RESOURCE_H=1 -DHAVE_SYS_SELECT_H=1 -DHAVE_SYS_STAT_H=1
  -DHAVE_SYS_TIME_H=1 -DHAVE_SYS_TIMES_H=1 -DHAVE_SYS_TYPES_H=1
  -DHAVE_SYS_UTSNAME_H=1 -DHAVE_TERMCAP_H=1 -DHAVE_TERMIO_H=1
  -DHAVE_TERMIOS_H=1 -DHAVE_UNISTD_H=1 -DHAVE_VARARGS_H=1 -DHAVE_ATEXIT=1
  -DHAVE_BCOPY=1 -DHAVE_BZERO=1 -DHAVE_DUP2=1 -DHAVE_ENDGRENT=1
  -DHAVE_ENDPWENT=1 -DHAVE_EXECVP=1 -DHAVE_FCNTL=1 -DHAVE_FORK=1
  -DHAVE_GETCWD=1 -DHAVE_GETEGID=1 -DHAVE_GETEUID=1 -DHAVE_GETGID=1
  -DHAVE_GETGRENT=1 -DHAVE_GETGRGID=1 -DHAVE_GETGRNAM=1 -DHAVE_GETHOSTNAME=1
  -DHAVE_GETPGRP=1 -DHAVE_GETPID=1 -DHAVE_GETPPID=1 -DHAVE_GETPWENT=1
  -DHAVE_GETPWNAM=1 -DHAVE_GETPWUID=1 -DHAVE_GETTIMEOFDAY=1 -DHAVE_GETUID=1
  -DHAVE_GETWD=1 -DHAVE_LSTAT=1 -DHAVE_MEMMOVE=1 -DHAVE_MKDIR=1
  -DHAVE_MKFIFO=1 -DHAVE_ON_EXIT=1 -DHAVE_PIPE=1 -DHAVE_PUTENV=1
  -DHAVE_RENAME=1 -DHAVE_RINDEX=1 -DHAVE_RMDIR=1 -DHAVE_SELECT=1
  -DHAVE_SETGRENT=1 -DHAVE_SETPWENT=1 -DHAVE_SETVBUF=1 -DHAVE_SIGACTION=1
  -DHAVE_SIGPENDING=1 -DHAVE_SIGPROCMASK=1 -DHAVE_SIGSUSPEND=1
  -DHAVE_STAT=1 -DHAVE_STRCASECMP=1 -DHAVE_STRDUP=1 -DHAVE_STRERROR=1
  -DHAVE_STRNCASECMP=1 -DHAVE_TEMPNAM=1 -DHAVE_UMASK=1 -DHAVE_UNLINK=1
  -DHAVE_USLEEP=1 -DHAVE_VFPRINTF=1 -DHAVE_VSPRINTF=1 -DHAVE_WAITPID=1
  -DSMART_PUTENV=1 -DHAVE_PROGRAM_INVOCATION_NAME=1 -DHAVE_LIBDL=1
  -DHAVE_DLOPEN=1 -DHAVE_DLSYM=1 -DHAVE_DLERROR=1 -DHAVE_DLCLOSE=1
  -DWITH_DL=1 -DWITH_DYNAMIC_LINKING=1 -DHAVE_FINITE=1 -DHAVE_ISNAN=1
  -DHAVE_ISINF=1 -DHAVE_ACOSH=1 -DHAVE_ASINH=1 -DHAVE_ATANH=1 -DHAVE_ERF=1
  -DHAVE_ERFC=1 -DHAVE_ST_BLKSIZE=1 -DHAVE_ST_BLOCKS=1 -DHAVE_ST_RDEV=1
  -DHAVE_TM_ZONE=1 -DHAVE_GR_PASSWD=1 -DEXCEPTION_IN_MATH=1
  -DRETSIGTYPE=void -DSYS_SIGLIST_DECLARED=1 -DHAVE_SYS_SIGLIST=1
  -DHAVE_POSIX_SIGNALS=1 -DHAVE_GETRUSAGE=1 -DHAVE_TIMES=1
  -DGNUPLOT_HAS_MULTIPLOT=1 -DGNUPLOT_HAS_FRAMES=1

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

  EDITOR = "vi"
  EXEC_PATH = 
"/home/pkienzle/octave/audio::/scratch/programs/audio/package/pipewave.1.3/bin:/scratch/programs/audio/pitch/POWERpv1.1G/bin:/home/pkienzle/pantome/bin:/home/pkienzle/sfs/bin:/scratch/usr/bin:/home/pkienzle/bin:/usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin:/usr/games"
  IMAGEPATH = ".:/usr/share/octave/2.0.16.91/imagelib//"
  INFO_FILE = "/usr/share/info/octave.info"
  INFO_PROGRAM = "info"
  LOADPATH = "/home/pkienzle/matcompat//:/home/pkienzle/octave//::"
  PAGER = "less"
  PS1 = "\\s:\\#> "
  PS2 = "> "
  PS4 = "+ "
  auto_unload_dot_oct_files = 1
  automatic_replot = 0
  beep_on_error = 0
  completion_append_char = " "
  default_eval_print_flag = 1
# default_global_variable_value = <no value or error in displaying it>
  default_return_value = []
  default_save_format = "ascii"
  define_all_return_values = 0
  do_fortran_indexing = 0
  echo_executing_commands = 0
  empty_list_elements_ok = "warn"
  fixed_point_format = 0
  gnuplot_binary = "gnuplot"
  gnuplot_has_frames = 1
  gnuplot_has_multiplot = 1
  history_file = "/home/pkienzle/.octave_hist"
  history_size = 1024
  ignore_function_time_stamp = "system"
  implicit_num_to_str_ok = 0
  implicit_str_to_num_ok = 0
  initialize_global_variables = 0
  max_recursion_depth = 256
  ok_to_lose_imaginary_part = "warn"
  output_max_field_width = 10
  output_precision = 5
  page_output_immediately = 0
  page_screen_output = 1
  prefer_column_vectors = 1
  prefer_zero_one_indexing = 0
  print_answer_id_name = 1
  print_empty_dimensions = 1
  propagate_empty_matrices = 1
  resize_on_range_error = 1
  return_last_computed_value = 0
  save_precision = 15
  saving_history = 1
  silent_functions = 0
  split_long_rows = 1
  string_fill_char = " "
  struct_levels_to_print = 2
  suppress_verbose_help_message = 1
  treat_neg_dim_as_zero = 0
  warn_assign_as_truth_value = 1
  warn_comma_in_global_decl = 1
  warn_divide_by_zero = 1
  warn_function_name_clash = 1
  warn_missing_semicolon = 0
  warn_reload_forces_clear = 1
  warn_variable_switch_label = 0
  whitespace_in_literal_matrix = 



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