How to Remove Element from List based on a Condition in R - Step by Step Examples

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How to Remove Element from List based on a Condition in R ?

Answer

To remove elements from a vector based on a condition in R, you can use indexing or the `subset` function.

✐ Examples

1 Remove Elements Greater Than a Threshold

In this example,

We create a vector named numbers with some elements.
We specify the threshold value.
We use indexing to subset the vector, keeping only the elements less than or equal to the threshold.
Finally, we print the modified vector to standard output.

R Program

numbers <- c(1, 2, 3, 4, 5)
threshold <- 3
modified_numbers <- numbers[numbers <= threshold]
print(paste('Modified vector after removing elements greater than', threshold, ':', modified_numbers))

Output

[1] "Modified vector after removing elements greater than 3 : 1 2 3"

2 Remove Elements Matching a Predicate

In this example,

We create a vector named names with some elements.
We define a predicate function is_long_name that returns TRUE if the length of the string is greater than a specified value.
We use the subset function to subset the vector based on the predicate condition.
Finally, we print the modified vector to standard output.

R Program

names <- c('John', 'Alice', 'Michael', 'Emma')
max_length <- 5
is_long_name <- function(name) {
    nchar(name) > max_length
}
modified_names <- subset(names, !sapply(names, is_long_name))
print(paste('Modified vector after removing long names:', modified_names))

Output

[1] "Modified vector after removing long names: John Alice Emma"

Summary

In this tutorial, we learned How to Remove Element from List based on a Condition in R language with well detailed examples.

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How to Remove Element from List based on a Condition in R - Step by Step Examples

How to Remove Element from List based on a Condition in R ?

Answer

✐ Examples

1 Remove Elements Greater Than a Threshold

R Program

Output

2 Remove Elements Matching a Predicate

R Program

Output

Summary

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