> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/sidef-lang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/sidef-lang/programming_tasks/r.md).

# R

- [Radical of an integer](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/radical_of_an_integer.md)
- [Ramanujan's constant](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/ramanujans_constant.md)
- [Ramanujan primes](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/ramanujan-primes.md)
- [Twins](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/ramanujan-primes/twins.md)
- [Ramer-Douglas-Peucker line simplification](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/ramer-douglas-peucker_line_simplification.md)
- [Ramsey's theorem](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/ramseys_theorem.md)
- [Random number generator device](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/random_number_generator_device.md)
- [Random number generator included](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/random_number_generator_included.md)
- [Random numbers](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/random_numbers.md)
- [Range expansion](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/range_expansion.md)
- [Ranking methods](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/ranking_methods.md)
- [Rate counter](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/rate_counter.md)
- [Read a configuration file](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/read_a_configuration_file.md)
- [Read a file character by character](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/read-a-file-character-by-character.md)
- [UTF8](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/read-a-file-character-by-character/utf8.md)
- [Read a file line by line](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/read_a_file_line_by_line.md)
- [Read a specific line from a file](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/read_a_specific_line_from_a_file.md)
- [Read entire file](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/read_entire_file.md)
- [Readline interface](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/readline_interface.md)
- [Real constants and functions](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/real_constants_and_functions.md)
- [Recaman's sequence](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/recamans_sequence.md)
- [Reduced row echelon form](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/reduced_row_echelon_form.md)
- [Reflection](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/reflection.md)
- [List methods](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/reflection/list_methods.md)
- [Regular expressions](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/regular_expressions.md)
- [Remove duplicate elements](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/remove_duplicate_elements.md)
- [Remove lines from a file](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/remove_lines_from_a_file.md)
- [Rename a file](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/rename_a_file.md)
- [Rep-string](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/rep-string.md)
- [Repeat](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/repeat.md)
- [Repeat a string](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/repeat_a_string.md)
- [Repunit primes](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/repunit_primes.md)
- [Resistor mesh](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/resistor_mesh.md)
- [Respond to an unknown method call](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/respond_to_an_unknown_method_call.md)
- [Return multiple values](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/return_multiple_values.md)
- [Reverse a string](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/reverse_a_string.md)
- [Reverse the gender of a string](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/reverse_the_gender_of_a_string.md)
- [Reverse words in a string](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/reverse_words_in_a_string.md)
- [Rhonda numbers](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/rhonda_numbers.md)
- [Rice coding](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/rice_coding.md)
- [Riordan numbers](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/riordan_numbers.md)
- [Rock-paper-scissors](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/rock-paper-scissors.md)
- [Roman numerals](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/roman-numerals.md)
- [Decode](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/roman-numerals/decode.md)
- [Encode](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/roman-numerals/encode.md)
- [Roots of a function](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/roots_of_a_function.md)
- [Roots of a quadratic function](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/roots_of_a_quadratic_function.md)
- [Roots of unity](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/roots_of_unity.md)
- [Rosetta Code](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/rosetta-code.md)
- [Count examples](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/rosetta-code/count_examples.md)
- [Fix code tags](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/rosetta-code/fix_code_tags.md)
- [Rank languages by popularity](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/rosetta-code/rank_languages_by_popularity.md)
- [Rot-13](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/rot-13.md)
- [RSA code](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/rsa_code.md)
- [Run-length encoding](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/run-length_encoding.md)
- [Run as a daemon or service](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/run_as_a_daemon_or_service.md)
- [Runge-Kutta method](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/runge-kutta_method.md)
- [Runtime evaluation](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/runtime_evaluation.md)
- [In an environment](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/runtime_evaluation/in_an_environment.md)
- [Ruth-Aaron numbers](https://trizen.gitbook.io/sidef-lang/programming_tasks/r/ruth-aaron_numbers.md)