Multiplication of array function

In the following line how can I use multiplication instead of "sum" ?

(sum(arrayfun(@(i)acos(S(i,i))^2,1:size(S,1)))) ;

Answer 1

[Voss]

prod

https://www.mathworks.com/help/matlab/ref/prod.html

[Voss]

Also, there is no need to use arrayfun because you can use diag to get the diagonal elements of S:

prod(acos(diag(S)).^2)

[M]

@Voss Thanks!

[Voss]

You're welcome!