Vectorised if-then else in R Programming

 

In R, vectorized if-then-else is a way to perform conditional operations on vectors. It is similar to the ifelse() function, but it allows for more complex conditions and multiple true / false results.

The ifelse() function in R is a vectorized version of the if-else statement that allows for conditional operations on vectors. It takes a logical condition and two vectors, and returns a vector containing the values from the second vector where the condition is TRUE, and the values from the third vector where the condition is FALSE.

Syntax:      ifelse(condition, true_vals, false_vals)

Parameters:

l    condition: A logical condition to be tested.

l    true_vals: A vector of values to return if the condition is TRUE

l    false_vals: A vector of values to return if the condition is FALSE

Example:

# Create a vector

x <- c(1, 2, 3, 4, 5)

# Use ifelse() to test if x is greater than 3

y <- ifelse(x > 3, "Greater than 3", "Less than or equal to 3")

# Print the results

y

Output:

[1] "Less than or equal to 3" "Less than or equal to 3" "Less than or equal to 3"

[4] "Greater than 3"          "Greater than 3"         

In this example, we create a vector x and use ifelse() function to test if each element of x is greater than 3. If the condition is TRUE, the corresponding element of y is set to the string "Greater than 3", otherwise it is set to the string "Less than or equal to 3". The resulting vector y contains the corresponding strings for each element of x.