MATLAB: I can’t use the output from the function

Question

Here is a simple function I created to generate the nth Fibonacci number:

function []=Fib(n)
sn(1) = 1;
sn(2) = 1;
for i=3:n
      sn(i)=sn(i-1)+sn(i-2);
end 
sn(n)
end

So Fib(5) give me ans = 5 However, when I try to execute "Fib(5)*2" I get the message "Too many output arguments" This is really really basic stuff, but I have no idea how to work Matlab and would appreciate some help. Thanks

Answer 1

Change the function definition to specify sn as an output:

function sn = Fib(n)

The line you wrote

sn(n)

does not output anything, it just displays a value in the command window. You can read in the documentation about how to define functions properly:

http://de.mathworks.com/help/matlab/ref/function.html

Bonus Tips

Learning MATLAB means learning lots of new things. A good place to start are by doing these tutorials:

http://de.mathworks.com/help/matlab/getting-started-with-matlab.html

and reading this advice for beginners:

http://www.mathworks.com/matlabcentral/answers/228557-experts-of-matlab-how-did-you-learn-any-advice-for-beginner-intermediate-users