In UBC-MDS/mlist_R: mlist

knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>"
)

Package Overview

R provides lots of tools to manipulate vectors. In this package, we will implement several vector manipulating functions, including binary_search(), flatten_dataframe_prime(), and find_prime(). The first function searches an input vector for a specified element. The other two functions deal with looking for prime numbers: flatten_dataframe_prime() returns a vector of the prime numbers in a dataframe, and find_prime() returns the largest prime number in a vector.

binary_search()

Description: Search if the value x exists in the lst, and return a vector contains: TRUE/FALSE depends on whether the x value has been found, x value, and x position indices in lst.

Input: the number x to search for and the list the search in

An error will be thrown in the following cases:

• the input x is not numeric
• the input list (lst) is not numeric
• the input x is greater than 1,000
• the input list (lst) contains a number greater than 1,000
• the input list (lst) is not sorted

Output: a vector with the elements:

1. TRUE/FALSE if x is in the list
2. the x value
3. the position of x in the list

Example: binary_search(4, c(1,2,3,4,5,6))

c('TRUE','4','4')

flatten_dataframe_prime()

Description: This function takes a dataframe of numbers and returns all the prime numbers in the dataframe.

Input: a dataframe of numbers The numbers must be less than or equal to 1,000.

An error will be thrown in the following cases:

• the input is not a dataframe
• there is a non-numeric element in the dataframe
• there is a number greater than 1,000

Output: a vector of all the prime numbers in the dataframe The output vector is sorted ascendingly, and duplicate prime numbers are removed.

Example: flatten_dataframe_prime(data.frame(c(2, 3, 4), c(5, 6, 7), c(8, 9, 10)))

c(2, 3, 5, 7)

find_prime()

Description: Return the largest prime number for a given list.

Input: a vector of numerics

An error will be thrown in the following cases:

• the vector has a length of zero
• the vector is not numeric
• the vector includes a number greater than 1,000

Output: the largest prime number in the input vector

Example: find_prime(c(0,1,2,3,4,5))

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UBC-MDS/mlist_R documentation built on May 7, 2019, 7:14 p.m.