Summary of Built-in Variables

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9.4 Summary of Built-in Variables

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, 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_LOADPATH: See Function Files.
Default value: ".:octave-home/lib/version".
EDITOR: See Commands For History.
Default value: "emacs".
EXEC_PATH: See Controlling Subprocesses.
Default value: ":$PATH".
INFO_FILE: See Getting Help.
Default value: "octave-home/info/octave.info".
INFO_PROGRAM: See Getting Help.
Default value: "octave-home/libexec/octave/version/exec/arch/info".
LOADPATH: See Function Files.
Default value: ":", which tells Octave to use the directories specified by the built-in variable DEFAULT_LOADPATH.
OCTAVE_HOME: Default value: "/usr".
PAGER: See Input and Output.
Default value: "less", or "more".
PS1: See Customizing the Prompt.
Default value: "\s:\#> ".
PS2: See Customizing the Prompt.
Default value: "> ".
PS4: See Customizing the Prompt.
Default value: "+ ".
automatic_replot: See Low-Level plotting commands.
Default value: 0.
beep_on_error: See Error Handling.
Default value: 0.
completion_append_char: See Commands For Completion.
Default value: " ".
default_save_format: See Simple File I/O.
Default value: "ascii".
crash_dumps_octave_core: See Simple File I/O.
Default value: 1.
fixed_point_format: See Matrices.
Default value: 0.
gnuplot_binary: See Three-Dimensional Plotting.
Default value: "gnuplot".
history_file: See Commands For History.
Default value: "~/.octave_hist".
history_size: See Commands For History.
Default value: 1024.
ignore_function_time_stamp: See Function Files.
Default value: "system".
max_recursion_depth: See Recursion.
Default value: 256.
output_max_field_width: See Matrices.
Default value: 10.
output_precision: See Matrices.
Default value: 5.
page_screen_output: See Input and Output.
Default value: 1.
print_answer_id_name: See Terminal Output.
Default value: 1.
print_empty_dimensions: See Empty Matrices.
Default value: 1.
return_last_computed_value: See Returning From a Function.
Default value: 0.
save_precision: See Simple File I/O.
Default value: 17.
saving_history: See Commands For History.
Default value: 1.
sighup_dumps_octave_core: See Simple File I/O.
Default value: 1.
sigterm_dumps_octave_core: See Simple File I/O.
Default value: 1.
silent_functions: See Defining Functions.
Default value: 0.
split_long_rows: See Matrices.
Default value: 1.
struct_levels_to_print: See Data Structures.
Default value: 2.
suppress_verbose_help_message: See Getting Help.
Default value: 1.
warn_assign_as_truth_value: See The if Statement.
Default value: 1.
warn_comma_in_global_decl: See Global Variables.
Default value: 1.
warn_divide_by_zero: See Arithmetic Ops.
Default value: 1.
warn_empty_list_elements: See Empty Matrices.
Default value: 0.
warn_fortran_indexing: See Index Expressions.
Default value: 0.
warn_function_name_clash: See Function Files.
Default value: 1.
warn_imag_to_real: See Special Utility Matrices.
Default value: 0.
warn_missing_semicolon: See Defining Functions.
Default value: 0.
warn_neg_dim_as_zero: See Special Utility Matrices.
Default value: 0.
warn_num_to_str: See String Conversions.
Default value: 1.
warn_reload_forces_clear: See Dynamically Linked Functions.
Default value: 1.
warn_resize_on_range_error: See Index Expressions.
Default value: 0.
warn_separator_insert: See Matrices.
Default value: 0.
warn_single_quote_string: See String Conversions.
Default value: 0.
warn_str_to_num: See String Conversions.
Default value: 0.
warn_undefined_return_values: See Multiple Return Values.
Default value: 0.
warn_variable_switch_label: See The switch Statement.
Default value: 0.