As suggested by Walter in one of the comments, it is probably the best to replace variable name 'mean' with a new name since MATLAB has in-built function named "mean". In your example, you can use a for loop to perform the mean computation using following code:
function [mn,std] = find_mean(x)
A = (1:1:x);
sum = 0;
num = numel(A);
for i=1:num
sum = sum + A(i);
end
mn = sum/num;
disp(mn);
end
However, it is recommended to use MATLAB in-built functions such as "sum", "mean" and so on whenever possible for efficient computations. I hope this answers your question.
