matlab - Recursive Function to generate / print a Fibonacci series -

i trying create recursive function call method print fibonacci until specific location:

1 function f = fibonacci(n) 2 fprintf('the value %d\n', n) 3 if (n==1) 4     f(1) = 1; 5     return; 6 elseif (n == 2) 7     f(2) = 2; 8 else 9     f(n) = fibonacci(n-1) + fibonacci(n-2);    10 end 11 end 

as per understanding fibonacci function called recursively until value of argument n passed 1. function stack rollback accordingly. when call function command:

>> fibonacci(4) 

the value of n 4, line 9 execute like:

9 f(4) = fibonacci(3) + fibonacci(2); 

now believe that first fibonacci(3) called - hence again fibonacci(3)

9 if(3) = fibonacci(2) + fibonacci(1); 

the ifs in line number 3 , 6 take care.

but how fibonacci(2) + fibonacci(1) statement change to:

 if(3) = 2 + 1; 

i receiving below error , unable debug further resolve it:

>> fibonacci(4) value 4 value 3 value 2 value 1 in assignment  a(i) = b, number of elements in b , must same.  error in fibonacci (line 9)     f(n) = fibonacci(n-1) + fibonacci(n-2);  error in fibonacci (line 9)     f(n) = fibonacci(n-1) + fibonacci(n-2); 

please provide insight solution , parameter fibonacci function recursively called @ line number 9 first , consequently.

ex n = 4

f(n) = fibonacci(3) + fibonacci(2); 

so matlab call fibonacci(3) or fibonacci(2) first?

shouldn't code thing below:

1 function f = fibonacci(n) 2 fprintf('the valus %d\n', n) 3 if (n==1) 4     f(1) = 1; 5     return f(1); 6 elseif (n == 2) 7     f(2) = 2; 8    return f(2); 9 else 10   f(n) = fibonacci(n-1) + fibonacci(n-2);    11 end 12 end 

fibonacci(4) error: file: fibonacci.m line: 5 column: 12 unexpected matlab expression.

why return expression in function resulting in error?

try this:

 function f = fibonacci(n)  if (n==1)      f= 1;  elseif (n == 2)      f = 2;  else      f = fibonacci(n-1) + fibonacci(n-2);     end 

note recursion (that evaluates each n once):

function f=fibonacci(n)   f=additive(n,1,2);  function a=additive(n,x0,x1)   if(n==1)     a=x0;   else      if(n==2)       a=x1;     else        a=additive(n-1,x1,x0+x1);     end   end