i have the problem with mean function

i got the problem with mean function, want to generate this formula e(i)=mean(c'*X(:,i))^2 but it doesnt work. what should i add to run the programe? thx

[the cyclist]

What are the sizes of X, c and e?

size(X)
size(c)
size(e)

What do you mean by "doesn't work"? If you get an error message, please give the full text of the error message?

[Wayne King]

It's important to include the error message or specify what you mean by "doesn't work". Because you don't give us your variables c or X, or tell us what you are trying to do, how can we possibly guess?

Answer 1

[Roger Stafford]

If the number of rows in c and X are not the same, matlab will complain.