Error using function: Not enough input arguments.

I get the following error every time i try to run a simple function

Not enough input arguments. My code is the following

function S = myfirstmatlab (n )
% gives the sum of the first n integers
S = 0; % start at zero
% The loop :
for i = 1: n % do n times
S = S + i; % add the current integer
end % end of the loop

Can someone help me to figure it out? The answers to similar questions did not help me.

Answer 1

[John D'Errico]

You don't RUN a function.

IMHO, run (or use of it from the menu) is the worst thing they ever introduced into MATLAB, in terms of newbies misusing the tool.

When you write a function, in order to use it, you need to use it at the command line, just as you use ANY OTHER FUNCTION.

So execute a line like this at the commandline:

S = myfirstmatlab(10);

Answer 2

[Thorsten]

You have to call the function with an argument n:

 >> myfirstmatlab(4)

Note that you can write your program in a single line

 S = sum(1:n);