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Introduction to Data Analysis and Visualization with R

Solution: Calculate String Length

Explore how to calculate string lengths in R by processing text files and manipulating strings. Understand the use of libraries and functions like str_detect and str_length to analyze and extract information from text data efficiently.

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Compare solutions

Please compare your code to the one given below. R is a flexible programming language. We can find the solution using extra functions or by following the steps in a different order. Please keep in mind that this solution is only one of many. Feel free to play with the code and try various methods. Here is our solution to the challenge in the previous lesson:

R
library(stringr)    # Call the libraries
library(readr)      # Call the libraries
create_matrix <- function(x){ 
  # Code between the lines 
  # ------
  text <- read_file('hello.txt')   # Read the file
  my_text <- str_to_lower(text)   # Lowercase the text
  my_text <- str_replace_all(my_text,'\n','')  # Replace all newline characters with nothing-delete-
  my_text <- str_split(my_text,' ')  # Split the text where blanks are
  my_text <- my_text[[1]]      # Select the first underlying element
  words <- my_text[str_detect(my_text,'sh')]   # Detect all words involving 'sh'
  result <- str_length(words)  # Calculate the lengths of words
  # ------
  #Please name the desired output as 'result'
  cat(result)
}
create_matrix(text)

Code explanation

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