The gsub() function in R can be used to replace all occurrences of certain text within a string in R.
This function uses the following basic syntax:
gsub(pattern, replacement, x)
where:
- pattern: The pattern to look for
- replacement: The replacement for the pattern
- x: The string to search
The following examples show how to use this function in practice.
Example 1: Replace Text in String
The following code shows how to replace a specific piece of text in a string:
#define string x This is a fun sentence" #replace 'fun' with 'great' x fun', 'great', x) #view updated string x [1] "This is a great sentence"
Example 2: Replace Single Text String in Vector
The following code shows how to replace multiple occurrences of a text in a vector:
#define vector x Mavs', 'Mavs', 'Spurs', 'Nets', 'Spurs', 'Mavs') #replace 'Mavs' with 'M' x Mavs', 'M', x) #view updated vector x [1] "M" "M" "Spurs" "Nets" "Spurs" "M"
Example 3: Replace Multiple Text Strings in Vector
The following code shows how to replace multiple occurrences of two different text strings in a vector:
#define vector x A', 'A', 'B', 'C', 'D', 'D') #replace 'A' or 'B' or 'C' with 'X' x A|B|C', 'X', x) #view updated string x [1] "X" "X" "X" "X" "D" "D"
Example 4: Replace Text in Data Frame
The following code shows how to replace text in a data frame:
#define data frame df frame(team=c('A', 'B', 'C', 'D'), conf=c('West', 'West', 'East', 'East'), points=c(99, 98, 92, 87), rebounds=c(18, 22, 26, 19)) #view data frame df team conf points rebounds 1 A West 99 18 2 B West 98 22 3 C East 92 26 4 D East 87 19 #replace 'West' and 'East' with 'W' and 'E' df$conf West', 'W', df$conf) df$conf East', 'E', df$conf) #view updated data frame df team conf points rebounds 1 A W 99 18 2 B W 98 22 3 C E 92 26 4 D E 87 19
Additional Resources
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