NRCPP

Useful C++ functions for tasks from stats to file IO.

NR Stats

Basic

All basic functions accept arrays or vectors where appropriate.

• mean - allows specification of value to substract with when averaging. This is useful for standard deviation calculations.
• median
• mode

Less basic but still kinda basic

• standard_deviation - accepts a vector / array and you can specificy sample or population (population is default)
• count_for_item - accepts a vector / array and returns the times a given item appears in it
• standard_deviation_of_matching_items - accepts a vector / array and returns the standard deviation of indices for matching items

NR Files

• put_file_in_vector - converts elements separated by a specified character into a vector
• load_csv_file - loads a csv file into a vector of vectors of strings
• get_words_from_file - extracts individual words from a file and places them into a vector
• get_lines_from_file - extracts individual lines from a file and places them into a vector
• get_unique_word_set_from_file - returns a set of unique words from a file where there are no duplicates
• get_string_from_file - turns a file into one string
• get_word_count_in_file - returns the number of times a word appears in a file
• get_word_count_from_unordered_set_in_file - returns the number of times items in a set appear in a file
• get_word_count_from_vector_in_file - returns the number of times items in a vector appear in a file

NR Utilities

• convert_array_string_to_double - converts an array of strings into an array of doubles
• convert_vector_string_to_double - converts a vector of strings into a vector of doubles

NR Strings

• isPunctuation - returns true if character is a puncuation mark (currently highly restrictive)
• isNotAlphanumeric - returns true if the character is not alphanumeric
• get_words_in_string - tokenizes a string into words
• get_word_count_from_string_matching_string - returns the number of times a string appears as a substring of another string
• get_word_count_from_string_matching_vector - returns the number of times strings in a vector appear as substrings of another string
• get_word_count_from_string_matching_array - returns the number of times strings in an array appear as substrings of another string

NR Scanner

This class is inspired by Apple's Foundation NSScanner.

Extracting parts of a string until a match:

std::string testString("This string is a string and this is more data in-between a string");
nr::scanner s(testString);

std::string targetString("string");
std::string result = s.scan_up_to_string(targetString);

std::cout << result << std::endl;

Outputs: "This "

Extracting multiple values in-between matching strings:

std::string testString("This string is a string and this is more data in-between a string");
nr::scanner s(testString);

std::string targetString("string");
std::string result("");

while (!s.is_at_end())
{
    s.scan_up_to_string(targetString);
    s.scan_string(targetString);
    result += s.scan_up_to_string(targetString);
}

std::cout << result << std::endl;

Outputs: "is a and this is more data in-between a"

C++ has built-in, optimized functions for finding matches in strings just as Foundation's NSString has methods for the like, but the hope here was to expose a more customizable interface to give granular control over how, for example, special characters, numbers and spaces are considered when scanning.