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Fibonacci Sequence Using Recursion in R
In this article, you find learn to print the fibonacci sequence by creating a recursive function, recurse_fibonacci().
The first two terms of the Fibonacci sequence is 0 followed by 1. All other terms are obtained by adding the preceding two terms.
This means to say the nth term is the sum of (n-1)th and (n-2)th term.
The Fibonacci sequence: 0, 1, 1, 2, 3, 5, 8, 13, 21
Example: Fibonacci Sequence in R
# Program to display the Fibonacci sequence up to n-th term using recursive functions
recurse_fibonacci <- function(n) {
if(n <= 1) {
return(n)
} else {
return(recurse_fibonacci(n-1) + recurse_fibonacci(n-2))
}
}
# take input from the user
nterms = as.integer(readline(prompt="How many terms? "))
# check if the number of terms is valid
if(nterms <= 0) {
print("Plese enter a positive integer")
} else {
print("Fibonacci sequence:")
for(i in 0:(nterms-1)) {
print(recurse_fibonacci(i))
}
}
Output
How many terms? 9 [1] "Fibonacci sequence:" [1] 0 [1] 1 [1] 1 [1] 2 [1] 3 [1] 5 [1] 8 [1] 13 [1] 21
Here, we ask the user for the number of terms in the sequence.
A recursive function recurse_fibonacci()
is used to calculate the nth term of the sequence. We use a for
loop to iterate and calculate each term recursively.
Python Examples for Beginners: Python Code to Display Fibonacci Sequence Using Recursion
R Examples for Beginners – Fibonacci Sequence Using Recursion in R
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