How to change a variable in a string

Hello,

I have a function that displays the nth Fibonacci number and outputs it. Using the code below I have resulted in the displaying this information as shown further down.

function fib(n)
% Set the Fibonacci number to calculate.
     
% Create a row vector called containing n ones. 
F = ones(1,n);
% This vector is used to store the Fibonacci
% numbers; its first element is currently F_1
% and its second element is F_2 (if n>1).
     
% If n>2, then use the recursive formula
% to calculate F_3, F_4, ... , F_n.
for k = 3:n
     
    F(k) = F(k-1) + F(k-2);
 status =['Fibonacci no. = ', num2str(F(k))];
disp(status);          
end

results in the output

Fibonacci no.= 2
Fibonacci no.= 3
Fibonacci no.= 5
Fibonacci no.= 8
Fibonacci no.= 13
Fibonacci no.= 21
Fibonacci no.= 34
Fibonacci no.= 55

for n = 10

How would I go about producing the result below?

Fibonacci no. 3 = 2
Fibonacci no. 4 = 3
Fibonacci no. 5 = 5
Fibonacci no. 6 = 8
Fibonacci no. 7 = 13
Fibonacci no. 8 = 21
Fibonacci no. 9 = 34
Fibonacci no. 10 = 55

Answer 1

[Rik]

It is much cleaner to use fprintf. That way you can also much more easily insert more numbers to display:

function fib(n)
% Set the Fibonacci number to calculate.
     
% Create a row vector called containing n ones. 
F = ones(1,n);
% This vector is used to store the Fibonacci
% numbers; its first element is currently F_1
% and its second element is F_2 (if n>1).
     
% If n>2, then use the recursive formula
% to calculate F_3, F_4, ... , F_n.
for k = 3:n
    F(k) = F(k-1) + F(k-2);
    fprintf('Fibonacci no. %d = %d\n',k,F(k));
end
end

Answer 2

[Mehmed Saad]

Use sprintf

status =sprintf('Fibonacci no.%d = %d',k,F(k));
disp(status);

But fprintf can do both job in 1 command i.e. format the string and print it

fprintf('Fibonacci no. % d = %d\n',k,F(k));