Can you explain how to run this in the command window please Tribonacci numbers

Question

Can you explain how to run this in the command window please

Tribonacci numbers are the numbers in a sequence in which the first three elements are 0, 1, and 1, and the value of each subsequent element is the sum of the previous three elements: 0, 1, 1, 2, 4, 7, 13, 24, ... Write a user defined function to determine the nth Tribonacci number. Name the function Tribonacci (). The function takes an integer n greaterthanorequalto land returns its corresponding Tribonacci number. For example, the function must return 0 for n=1, 1 for n=2 and 13 for n=7 and so on. The function must display an error message if the number entered was either less than 1 or not an integer. The function must have a help section that shows what it exactly does, its input and its output. Use the function to determine the Tribonacci number for n = 0, 2.5, 3, 10, 20, and 34.

Explanation / Answer

% Compute the Tribonacci number n
% input number n
% output tribonacci number of n
function tbn = Tribonacci(n)
if n < 1
disp("Errr: Number should be greater than equal to 1")
return
end
  
if floor(n)!=n
disp("Error: Number can not be non integer")
return
end
  
if n == 1
tbn = 0
return
end
  
if n == 2
tbn = 1
return
end
  
if n == 3
tbn = 1
return
end
  
prev_prev_prev = 0
prev_prev = 1
prev = 1
tbn = 0
for i = 4:n
tbn = prev + prev_prev + prev_prev_prev
prev_prev_prev = prev_prev
prev_prev = prev
prev = tbn
end
end

Arr = [0;2.5;3;10;20;34]
for i = 1:6
disp(Tribonacci(Arr(i)))
end

Save it in a tribonacci.m file and run

matlab tribonacci.m

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