R Program to Find Index of an Element in a Vector
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Example 1: Find Index Value of R Vector Element Using match()
# create two strings
vowel_letters <- c("a", "e", "i", "o", "u")
# find index value of "i"
match("i", vowel_letters) # 3
# find index value of "u"
match("u", vowel_letters) # 5
Output
[1] 3 [1] 5
In the above example, we have used the match() function to find the index of an element in the vector named vowel_letters.
Here,
"i"is present in vowel_letters at the 3rd index, so the method returns 3"u"is present in vowel_letters at the 5th index, so the method returns 5
Example 2: Find Index Value of R Vector Element Using which()
# create two strings
languages <- c("R", "Swift", "Java", "Python")
# find index value of "Swift" using which()
which(languages == "Swift") # 2
# find index value of "Python" using which()
which(languages == "Python") # 4
Output
[1] 2 [2] 4
Here, we have used the which() function to find the index value of an element.
Since,
"Swift"is present in languages at the 2nd index, so the method returns 2"Python"is present in languages at the 4th index, so the method returns 4
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