I need help with this matlab code... I look for help in Chegg and the answer is

Question

I need help with this matlab code...
I look for help in Chegg and the answer
is giving in this link (please, visit the link:
http://www.chegg.com/homework-help/questions-and-answers/polytechnic-university-puerto-rico-electrical-computer-engineering-computer-science-depart-q19487728    )

But when I try this code given as a "solution" for the statement in Chegg...

The Matlab software trigger an error:

"function [y]= sumbothends (×, L)
ERROR: Function definitions are not permitted in this context..."
(see picture attached).

Please HELP ME!!! I need the help rush...
thanks!!

Explanation / Answer

Create 2 files

1) driver.m

2) sumbothends.m

And run driver.m after pasting following codes into respective files!

sumbothends.m

function [y]= sumbothends (x, L)
if(L <= 0 || L > size(x,2) )
fprintf('Invalid input! ') ;
else
y = [sum(x(1:L)) , sum( x( (size(x,2) -L+1) : size(x,2) ))];
end
end

driver.m

y = sumbothends([3,2,-1,3, 2,1,3],3);
y

Sample Output:

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