How to do string manipulation in R?
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How to do string manipulation in R?

How to do string manipulation in R?

This recipe helps you do string manipulation in R

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Recipe Objective

String or character datatype is constructed by specifying any value in double quotes or single quotes. String manipulation in R include Concatenation, formatting the style, Changing the case and Extracting parts of a string.

This recipe demonstrates Concatenation and Extracting parts of a string.

1. Concatenation

We use paste() function to combine different string values. It takes any number of arguements.

Syntax:

paste(x, sep, collapse)

where:

  1. x = any number of string values that needs to be combined
  2. sep = (optional) any separator between the arguements
  3. collapse = It is used to remove the spaces between two strings/arguements but not the space within two words.

Example: ​

# assigning strings value to three variables x = "Hello" y = "fellow human" z = "I am Siri" ​ ​ # using paste() function print(paste(x,y,z, sep = " ", collapse = NULL)) ​
[1] "Hello fellow human I am Siri"

2. Extraction

We use substring() function to extract parts of the string.

Syntax:

substring(x, first, last)

where:

  1. x = any character vector
  2. first = start position whee extraction needs to take place
  3. end = end position until where exctraction needs to take place

Example:

# assigning string value to a variable z = "I am Siri" ​ ​ # using substring() function to extract "am" from z vector print(substring(z, 3,4))
[1] "am"

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