How to Filter Elements of a List based on a Condition in R - Step by Step Examples

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How to Filter Elements of a List based on a Condition in R ?

Answer

To filter elements of a list based on a condition in R, you can use the subset function or logical indexing.

✐ Examples

1 Filter Integers Greater Than a Threshold

In this example,

We create a vector named numbers with integer values.
We use logical indexing to filter elements greater than a threshold value.
Finally, we print the filtered vector to standard output.

R Program

numbers <- c(1, 2, 3, 4, 5)
threshold <- 3
filtered_numbers <- numbers[numbers > threshold]
print(filtered_numbers)

Output

[1] 4 5

2 Filter Strings Containing a Substring

In this example,

We create a vector named words with string values.
We use the grepl function to create a logical vector indicating if a substring is present in each element.
We use the logical vector to subset the vector and obtain the filtered elements.
Finally, we print the filtered vector to standard output.

R Program

words <- c('apple', 'banana', 'cherry', 'date', 'elderberry')
substring <- 'erry'
filtered_words <- words[grepl(substring, words)]
print(filtered_words)

Output

[1] "cherry"      "elderberry"

Summary

In this tutorial, we learned How to Filter Elements of a List based on a Condition in R language with well detailed examples.

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How to Filter Elements of a List based on a Condition in R - Step by Step Examples

How to Filter Elements of a List based on a Condition in R ?

Answer

✐ Examples

1 Filter Integers Greater Than a Threshold

R Program

Output

2 Filter Strings Containing a Substring

R Program

Output

Summary

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