STDLIB

Reference Manual

Version 3.13.1

• User's Guide
• Reference Manual
• Release Notes
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Table of Contents

• STDLIB (App)
• array
  • Top of manual page
  • default/1
  • fix/1
  • foldl/3
  • foldr/3
  • from_list/1
  • from_list/2
  • from_orddict/1
  • from_orddict/2
  • get/2
  • is_array/1
  • is_fix/1
  • map/2
  • new/0
  • new/1
  • new/2
  • relax/1
  • reset/2
  • resize/1
  • resize/2
  • set/3
  • size/1
  • sparse_foldl/3
  • sparse_foldr/3
  • sparse_map/2
  • sparse_size/1
  • sparse_to_list/1
  • sparse_to_orddict/1
  • to_list/1
  • to_orddict/1
• assert.hrl
• base64
  • Top of manual page
  • decode/1
  • decode_to_string/1
  • encode/1
  • encode_to_string/1
  • mime_decode/1
  • mime_decode_to_string/1
• beam_lib
  • Top of manual page
  • all_chunks/1
  • build_module/1
  • chunks/2
  • chunks/3
  • clear_crypto_key_fun/0
  • cmp/2
  • cmp_dirs/2
  • crypto_key_fun/1
  • diff_dirs/2
  • format_error/1
  • info/1
  • md5/1
  • strip/1
  • strip/2
  • strip_files/1
  • strip_files/2
  • strip_release/1
  • strip_release/2
  • version/1
• binary
  • Top of manual page
  • at/2
  • bin_to_list/1
  • bin_to_list/2
  • bin_to_list/3
  • compile_pattern/1
  • copy/1
  • copy/2
  • decode_unsigned/1
  • decode_unsigned/2
  • encode_unsigned/1
  • encode_unsigned/2
  • first/1
  • last/1
  • list_to_bin/1
  • longest_common_prefix/1
  • longest_common_suffix/1
  • match/2
  • match/3
  • matches/2
  • matches/3
  • part/2
  • part/3
  • referenced_byte_size/1
  • replace/3
  • replace/4
  • split/2
  • split/3
• c
  • Top of manual page
  • bt/1
  • c/1
  • c/2
  • c/3
  • cd/1
  • erlangrc/1
  • flush/0
  • h/1
  • h/2
  • h/3
  • help/0
  • ht/1
  • ht/2
  • ht/3
  • i/0
  • i/3
  • l/1
  • lc/1
  • lm/0
  • ls/0
  • ls/1
  • m/0
  • m/1
  • memory/0
  • memory/1
  • mm/0
  • nc/1
  • nc/2
  • ni/0
  • nl/1
  • nregs/0
  • pid/3
  • pwd/0
  • q/0
  • regs/0
  • uptime/0
  • xm/1
  • y/1
  • y/2
• calendar
  • Top of manual page
  • date_to_gregorian_days/1
  • date_to_gregorian_days/3
  • datetime_to_gregorian_seconds/1
  • day_of_the_week/1
  • day_of_the_week/3
  • gregorian_days_to_date/1
  • gregorian_seconds_to_datetime/1
  • is_leap_year/1
  • iso_week_number/0
  • iso_week_number/1
  • last_day_of_the_month/2
  • local_time/0
  • local_time_to_universal_time/1
  • local_time_to_universal_time_dst/1
  • now_to_datetime/1
  • now_to_local_time/1
  • now_to_universal_time/1
  • rfc3339_to_system_time/1
  • rfc3339_to_system_time/2
  • seconds_to_daystime/1
  • seconds_to_time/1
  • system_time_to_local_time/2
  • system_time_to_rfc3339/1
  • system_time_to_rfc3339/2
  • system_time_to_universal_time/2
  • time_difference/2
  • time_to_seconds/1
  • universal_time/0
  • universal_time_to_local_time/1
  • valid_date/1
  • valid_date/3
• dets
  • Top of manual page
  • all/0
  • bchunk/2
  • close/1
  • delete/2
  • delete_all_objects/1
  • delete_object/2
  • first/1
  • foldl/3
  • foldr/3
  • from_ets/2
  • info/1
  • info/2
  • init_table/2
  • init_table/3
  • insert/2
  • insert_new/2
  • is_compatible_bchunk_format/2
  • is_dets_file/1
  • lookup/2
  • match/1
  • match/2
  • match/3
  • match_delete/2
  • match_object/1
  • match_object/2
  • match_object/3
  • member/2
  • next/2
  • open_file/1
  • open_file/2
  • pid2name/1
  • repair_continuation/2
  • safe_fixtable/2
  • select/1
  • select/2
  • select/3
  • select_delete/2
  • slot/2
  • sync/1
  • table/1
  • table/2
  • to_ets/2
  • traverse/2
  • update_counter/3
• dict
  • Top of manual page
  • append/3
  • append_list/3
  • erase/2
  • fetch/2
  • fetch_keys/1
  • filter/2
  • find/2
  • fold/3
  • from_list/1
  • is_empty/1
  • is_key/2
  • map/2
  • merge/3
  • new/0
  • size/1
  • store/3
  • take/2
  • to_list/1
  • update/3
  • update/4
  • update_counter/3
• digraph
  • Top of manual page
  • add_edge/3
  • add_edge/4
  • add_edge/5
  • add_vertex/1
  • add_vertex/2
  • add_vertex/3
  • del_edge/2
  • del_edges/2
  • del_path/3
  • del_vertex/2
  • del_vertices/2
  • delete/1
  • edge/2
  • edges/1
  • edges/2
  • get_cycle/2
  • get_path/3
  • get_short_cycle/2
  • get_short_path/3
  • in_degree/2
  • in_edges/2
  • in_neighbours/2
  • info/1
  • new/0
  • new/1
  • no_edges/1
  • no_vertices/1
  • out_degree/2
  • out_edges/2
  • out_neighbours/2
  • vertex/2
  • vertices/1
• digraph_utils
  • Top of manual page
  • arborescence_root/1
  • components/1
  • condensation/1
  • cyclic_strong_components/1
  • is_acyclic/1
  • is_arborescence/1
  • is_tree/1
  • loop_vertices/1
  • postorder/1
  • preorder/1
  • reachable/2
  • reachable_neighbours/2
  • reaching/2
  • reaching_neighbours/2
  • strong_components/1
  • subgraph/2
  • subgraph/3
  • topsort/1
• epp
  • Top of manual page
  • close/1
  • default_encoding/0
  • encoding_to_string/1
  • format_error/1
  • open/1
  • open/2
  • open/3
  • parse_erl_form/1
  • parse_file/2
  • parse_file/3
  • read_encoding/1
  • read_encoding/2
  • read_encoding_from_binary/1
  • read_encoding_from_binary/2
  • set_encoding/1
  • set_encoding/2
• erl_anno
  • Top of manual page
  • column/1
  • end_location/1
  • file/1
  • from_term/1
  • generated/1
  • is_anno/1
  • line/1
  • location/1
  • new/1
  • set_file/2
  • set_generated/2
  • set_line/2
  • set_location/2
  • set_record/2
  • set_text/2
  • text/1
  • to_term/1
• erl_eval
  • Top of manual page
  • add_binding/3
  • binding/2
  • bindings/1
  • del_binding/2
  • expr/2
  • expr/3
  • expr/4
  • expr/5
  • expr_list/2
  • expr_list/3
  • expr_list/4
  • exprs/2
  • exprs/3
  • exprs/4
  • new_bindings/0
• erl_expand_records
  • Top of manual page
  • module/2
• erl_id_trans
  • Top of manual page
  • parse_transform/2
• erl_internal
  • Top of manual page
  • add_predefined_functions/1
  • arith_op/2
  • bif/2
  • bool_op/2
  • comp_op/2
  • guard_bif/2
  • list_op/2
  • op_type/2
  • send_op/2
  • type_test/2
• erl_lint
  • Top of manual page
  • format_error/1
  • is_guard_test/1
  • module/1
  • module/2
  • module/3
• erl_parse
  • Top of manual page
  • abstract/1
  • abstract/2
  • anno_from_term/1
  • anno_to_term/1
  • fold_anno/3
  • format_error/1
  • map_anno/2
  • mapfold_anno/3
  • new_anno/1
  • normalise/1
  • parse_exprs/1
  • parse_form/1
  • parse_term/1
  • tokens/1
  • tokens/2
• erl_pp
  • Top of manual page
  • attribute/1
  • attribute/2
  • expr/1
  • expr/2
  • expr/3
  • expr/4
  • exprs/1
  • exprs/2
  • exprs/3
  • form/1
  • form/2
  • function/1
  • function/2
  • guard/1
  • guard/2
• erl_scan
  • Top of manual page
  • category/1
  • column/1
  • end_location/1
  • format_error/1
  • line/1
  • location/1
  • reserved_word/1
  • string/1
  • string/2
  • string/3
  • symbol/1
  • text/1
  • tokens/3
  • tokens/4
• erl_tar
  • Top of manual page
  • add/3
  • add/4
  • close/1
  • create/2
  • create/3
  • extract/1
  • extract/2
  • format_error/1
  • init/3
  • open/2
  • t/1
  • table/1
  • table/2
  • tt/1
• ets
  • Top of manual page
  • all/0
  • delete/1
  • delete/2
  • delete_all_objects/1
  • delete_object/2
  • file2tab/1
  • file2tab/2
  • first/1
  • foldl/3
  • foldr/3
  • from_dets/2
  • fun2ms/1
  • give_away/3
  • i/0
  • i/1
  • info/1
  • info/2
  • init_table/2
  • insert/2
  • insert_new/2
  • is_compiled_ms/1
  • last/1
  • lookup/2
  • lookup_element/3
  • match/1
  • match/2
  • match/3
  • match_delete/2
  • match_object/1
  • match_object/2
  • match_object/3
  • match_spec_compile/1
  • match_spec_run/2
  • member/2
  • new/2
  • next/2
  • prev/2
  • rename/2
  • repair_continuation/2
  • safe_fixtable/2
  • select/1
  • select/2
  • select/3
  • select_count/2
  • select_delete/2
  • select_replace/2
  • select_reverse/1
  • select_reverse/2
  • select_reverse/3
  • setopts/2
  • slot/2
  • tab2file/2
  • tab2file/3
  • tab2list/1
  • tabfile_info/1
  • table/1
  • table/2
  • take/2
  • test_ms/2
  • to_dets/2
  • update_counter/3
  • update_counter/4
  • update_element/3
  • whereis/1
• file_sorter
  • Top of manual page
  • check/1
  • check/2
  • keycheck/2
  • keycheck/3
  • keymerge/3
  • keymerge/4
  • keysort/2
  • keysort/3
  • keysort/4
  • merge/2
  • merge/3
  • sort/1
  • sort/2
  • sort/3
• filelib
  • Top of manual page
  • ensure_dir/1
  • file_size/1
  • find_file/2
  • find_file/3
  • find_source/1
  • find_source/2
  • find_source/3
  • fold_files/5
  • is_dir/1
  • is_file/1
  • is_regular/1
  • last_modified/1
  • safe_relative_path/2
  • wildcard/1
  • wildcard/2
• filename
  • Top of manual page
  • absname/1
  • absname/2
  • absname_join/2
  • basedir/2
  • basedir/3
  • basename/1
  • basename/2
  • dirname/1
  • extension/1
  • find_src/1
  • find_src/2
  • flatten/1
  • join/1
  • join/2
  • nativename/1
  • pathtype/1
  • rootname/1
  • rootname/2
  • safe_relative_path/1
  • split/1
• gb_sets
  • Top of manual page
  • add/2
  • add_element/2
  • balance/1
  • del_element/2
  • delete/2
  • delete_any/2
  • difference/2
  • empty/0
  • filter/2
  • fold/3
  • from_list/1
  • from_ordset/1
  • insert/2
  • intersection/1
  • intersection/2
  • is_disjoint/2
  • is_element/2
  • is_empty/1
  • is_member/2
  • is_set/1
  • is_subset/2
  • iterator/1
  • iterator_from/2
  • largest/1
  • new/0
  • next/1
  • singleton/1
  • size/1
  • smallest/1
  • subtract/2
  • take_largest/1
  • take_smallest/1
  • to_list/1
  • union/1
  • union/2
• gb_trees
  • Top of manual page
  • balance/1
  • delete/2
  • delete_any/2
  • empty/0
  • enter/3
  • from_orddict/1
  • get/2
  • insert/3
  • is_defined/2
  • is_empty/1
  • iterator/1
  • iterator_from/2
  • keys/1
  • largest/1
  • lookup/2
  • map/2
  • next/1
  • size/1
  • smallest/1
  • take/2
  • take_any/2
  • take_largest/1
  • take_smallest/1
  • to_list/1
  • update/3
  • values/1
• gen_event
  • Top of manual page
  • add_handler/3
  • add_sup_handler/3
  • call/3
  • call/4
  • check_response/2
  • delete_handler/3
  • notify/2
  • send_request/3
  • start/0
  • start/1
  • start/2
  • start_link/0
  • start_link/1
  • start_link/2
  • start_monitor/0
  • start_monitor/1
  • start_monitor/2
  • stop/1
  • stop/3
  • swap_handler/3
  • swap_sup_handler/3
  • sync_notify/2
  • wait_response/2
  • which_handlers/1
  • Module:code_change/3
  • Module:format_status/2
  • Module:handle_call/2
  • Module:handle_event/2
  • Module:handle_info/2
  • Module:init/1
  • Module:terminate/2
• gen_fsm
• gen_server
  • Top of manual page
  • abcast/2
  • abcast/3
  • call/2
  • call/3
  • cast/2
  • check_response/2
  • enter_loop/3
  • enter_loop/4
  • enter_loop/4
  • enter_loop/5
  • multi_call/2
  • multi_call/3
  • multi_call/4
  • reply/2
  • send_request/2
  • start/3
  • start/4
  • start_link/3
  • start_link/4
  • start_monitor/3
  • start_monitor/4
  • stop/1
  • stop/3
  • wait_response/2
  • Module:code_change/3
  • Module:format_status/2
  • Module:handle_call/3
  • Module:handle_cast/2
  • Module:handle_continue/2
  • Module:handle_info/2
  • Module:init/1
  • Module:terminate/2
• gen_statem
  • Top of manual page
  • call/2
  • call/3
  • cast/2
  • check_response/2
  • enter_loop/4
  • enter_loop/5
  • enter_loop/6
  • reply/1
  • reply/2
  • send_request/2
  • start/3
  • start/4
  • start_link/3
  • start_link/4
  • start_monitor/3
  • start_monitor/4
  • stop/1
  • stop/3
  • wait_response/1
  • wait_response/2
  • Module:StateName/3
  • Module:StateName/3
  • Module:callback_mode/0
  • Module:code_change/4
  • Module:format_status/2
  • Module:handle_event/4
  • Module:handle_event/4
  • Module:init/1
  • Module:terminate/3
• io
  • Top of manual page
  • columns/0
  • columns/1
  • format/1
  • format/2
  • format/3
  • fread/2
  • fread/3
  • fwrite/1
  • fwrite/2
  • fwrite/3
  • get_chars/2
  • get_chars/3
  • get_line/1
  • get_line/2
  • getopts/0
  • getopts/1
  • nl/0
  • nl/1
  • parse_erl_exprs/1
  • parse_erl_exprs/2
  • parse_erl_exprs/3
  • parse_erl_exprs/4
  • parse_erl_form/1
  • parse_erl_form/2
  • parse_erl_form/3
  • parse_erl_form/4
  • printable_range/0
  • put_chars/1
  • put_chars/2
  • read/1
  • read/2
  • read/3
  • read/4
  • rows/0
  • rows/1
  • scan_erl_exprs/1
  • scan_erl_exprs/2
  • scan_erl_exprs/3
  • scan_erl_exprs/4
  • scan_erl_form/1
  • scan_erl_form/2
  • scan_erl_form/3
  • scan_erl_form/4
  • setopts/1
  • setopts/2
  • write/1
  • write/2
• io_lib
  • Top of manual page
  • build_text/1
  • char_list/1
  • deep_char_list/1
  • deep_latin1_char_list/1
  • format/2
  • format/3
  • fread/2
  • fread/3
  • fwrite/2
  • fwrite/3
  • indentation/2
  • latin1_char_list/1
  • nl/0
  • print/1
  • print/4
  • printable_latin1_list/1
  • printable_list/1
  • printable_unicode_list/1
  • scan_format/2
  • unscan_format/1
  • write/1
  • write/2
  • write_atom/1
  • write_atom_as_latin1/1
  • write_char/1
  • write_char_as_latin1/1
  • write_latin1_char/1
  • write_latin1_string/1
  • write_string/1
  • write_string_as_latin1/1
• lists
  • Top of manual page
  • all/2
  • any/2
  • append/1
  • append/2
  • concat/1
  • delete/2
  • droplast/1
  • dropwhile/2
  • duplicate/2
  • filter/2
  • filtermap/2
  • flatlength/1
  • flatmap/2
  • flatten/1
  • flatten/2
  • foldl/3
  • foldr/3
  • foreach/2
  • join/2
  • keydelete/3
  • keyfind/3
  • keymap/3
  • keymember/3
  • keymerge/3
  • keyreplace/4
  • keysearch/3
  • keysort/2
  • keystore/4
  • keytake/3
  • last/1
  • map/2
  • mapfoldl/3
  • mapfoldr/3
  • max/1
  • member/2
  • merge/1
  • merge/2
  • merge/3
  • merge3/3
  • min/1
  • nth/2
  • nthtail/2
  • partition/2
  • prefix/2
  • reverse/1
  • reverse/2
  • search/2
  • seq/2
  • seq/3
  • sort/1
  • sort/2
  • split/2
  • splitwith/2
  • sublist/2
  • sublist/3
  • subtract/2
  • suffix/2
  • sum/1
  • takewhile/2
  • ukeymerge/3
  • ukeysort/2
  • umerge/1
  • umerge/2
  • umerge/3
  • umerge3/3
  • unzip/1
  • unzip3/1
  • usort/1
  • usort/2
  • zip/2
  • zip3/3
  • zipwith/3
  • zipwith3/4
• log_mf_h
  • Top of manual page
  • init/3
  • init/4
• maps
  • Top of manual page
  • filter/2
  • find/2
  • fold/3
  • from_list/1
  • get/2
  • get/3
  • is_key/2
  • iterator/1
  • keys/1
  • map/2
  • merge/2
  • new/0
  • next/1
  • put/3
  • remove/2
  • size/1
  • take/2
  • to_list/1
  • update/3
  • update_with/3
  • update_with/4
  • values/1
  • with/2
  • without/2
• math
  • Top of manual page
  • acos/1
  • acosh/1
  • asin/1
  • asinh/1
  • atan/1
  • atan2/2
  • atanh/1
  • ceil/1
  • cos/1
  • cosh/1
  • erf/1
  • erfc/1
  • exp/1
  • floor/1
  • fmod/2
  • log/1
  • log10/1
  • log2/1
  • pi/0
  • pow/2
  • sin/1
  • sinh/1
  • sqrt/1
  • tan/1
  • tanh/1
• ms_transform
  • Top of manual page
  • format_error/1
  • parse_transform/2
  • transform_from_shell/3
• orddict
  • Top of manual page
  • append/3
  • append_list/3
  • erase/2
  • fetch/2
  • fetch_keys/1
  • filter/2
  • find/2
  • fold/3
  • from_list/1
  • is_empty/1
  • is_key/2
  • map/2
  • merge/3
  • new/0
  • size/1
  • store/3
  • take/2
  • to_list/1
  • update/3
  • update/4
  • update_counter/3
• ordsets
  • Top of manual page
  • add_element/2
  • del_element/2
  • filter/2
  • fold/3
  • from_list/1
  • intersection/1
  • intersection/2
  • is_disjoint/2
  • is_element/2
  • is_empty/1
  • is_set/1
  • is_subset/2
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• qlc
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• rand
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• random
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• re
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• shell
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• shell_default
• shell_docs
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• slave
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• sofs
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  • a_function/1
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  • to_external/1
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• string
  • Top of manual page
  • casefold/1
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  • titlecase/1
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• supervisor
  • Top of manual page
  • check_childspecs/1
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  • start_link/3
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  • which_children/1
  • Module:init/1
• supervisor_bridge
  • Top of manual page
  • start_link/2
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• sys
  • Top of manual page
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  • handle_system_msg/6
  • install/2
  • install/3
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  • no_debug/1
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  • resume/1
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  • terminate/3
  • trace/2
  • trace/3
  • Module:system_code_change/4
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• timer
  • Top of manual page
  • apply_after/4
  • apply_interval/4
  • cancel/1
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  • hours/1
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  • kill_after/2
  • minutes/1
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  • seconds/1
  • send_after/2
  • send_after/3
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  • send_interval/3
  • sleep/1
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  • tc/1
  • tc/2
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• unicode
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  • bom_to_encoding/1
  • characters_to_binary/1
  • characters_to_binary/2
  • characters_to_binary/3
  • characters_to_list/1
  • characters_to_list/2
  • characters_to_nfc_binary/1
  • characters_to_nfc_list/1
  • characters_to_nfd_binary/1
  • characters_to_nfd_list/1
  • characters_to_nfkc_binary/1
  • characters_to_nfkc_list/1
  • characters_to_nfkd_binary/1
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  • encoding_to_bom/1
• uri_string
  • Top of manual page
  • compose_query/1
  • compose_query/2
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  • normalize/2
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• win32reg
  • Top of manual page
  • change_key/2
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• zip
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  • create/2
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  • t/1
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  • zip_list_dir/1
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  • zip_open/2