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Here is a summary of all of Octave's built-in variables along with
cross references to additional information and their default values. In
the following table octave-home stands for the root directory
where all of Octave is installed (the default is /usr/local,
version stands for the Octave version number (for example,
2.1.x) and arch stands for the type of system for which
Octave was compiled (for example, i586-pc-linux-gnu).
DEFAULT_LOADPATHDefault value: ".:octave-home/lib/version".
EDITORDefault value: "emacs".
EXEC_PATHDefault value: ":$PATH".
INFO_FILEDefault value: "octave-home/info/octave.info".
INFO_PROGRAMDefault value: "octave-home/libexec/octave/version/exec/arch/info".
LOADPATHDefault value: ":", which tells Octave to use the directories
specified by the built-in variable DEFAULT_LOADPATH.
OCTAVE_HOME"/usr/local".
PAGERDefault value: "less", or "more".
PS1Default value: "\s:\#> ".
PS2Default value: "> ".
PS4Default value: "+ ".
automatic_replotDefault value: 0.
beep_on_errorDefault value: 0.
completion_append_charDefault value: " ".
default_save_formatDefault value: "ascii".
crash_dumps_octave_coreDefault value: 1.
fixed_point_formatDefault value: 0.
gnuplot_binaryDefault value: "gnuplot".
history_fileDefault value: "~/.octave_hist".
history_sizeDefault value: 1024.
ignore_function_time_stampDefault value: "system".
max_recursion_depthDefault value: 256.
output_max_field_widthDefault value: 10.
output_precisionDefault value: 5.
page_screen_outputDefault value: 1.
print_answer_id_nameDefault value: 1.
print_empty_dimensionsDefault value: 1.
return_last_computed_valueDefault value: 0.
save_precisionDefault value: 17.
saving_historyDefault value: 1.
sighup_dumps_octave_coreDefault value: 1.
sigterm_dumps_octave_coreDefault value: 1.
silent_functionsDefault value: 0.
split_long_rowsDefault value: 1.
struct_levels_to_printDefault value: 2.
suppress_verbose_help_messageDefault value: 1.
warn_assign_as_truth_valueDefault value: 1.
warn_comma_in_global_declDefault value: 1.
warn_divide_by_zeroDefault value: 1.
warn_empty_list_elementsDefault value: 0.
warn_fortran_indexingDefault value: 0.
warn_function_name_clashDefault value: 1.
warn_imag_to_realDefault value: 0.
warn_missing_semicolonDefault value: 0.
warn_neg_dim_as_zeroDefault value: 0.
warn_num_to_strDefault value: 1.
warn_reload_forces_clearDefault value: 1.
warn_resize_on_range_errorDefault value: 0.
warn_separator_insertDefault value: 0.
warn_single_quote_stringDefault value: 0.
warn_str_to_numDefault value: 0.
warn_undefined_return_valuesDefault value: 0.
warn_variable_switch_labelDefault value: 0.