Finding Mean of Vector x: A & B Equal?

[magma_saber]

Homework Statement

Below are two for loops that each find the mean of all the values in the vector x. A and B should be equal to the mean of the vector x.

Homework Equations

The Attempt at a Solution

A = 0;
for index = mean(x)
A = A + x(index)/length(x);
end

B = 0;
for index = mean(x)
B = B + index/length(x);
end

A file was provided that checks to see if its right. when i execute it, it says, "Attempted to access x(6); index out of bounds because numel(x)=5." what am i doing wrong? most of the code was already provided. all it asks is what "for index =" is equal to.

 

[MATLABdude]

Your answer to the question "for index =" is incorrect. Given that x is a vector of several numbers, how would you calculate the mean (average) by hand?

Now, when you do mean(x) in MATLAB, you get the mean of the vector x:
http://www.mathworks.com/access/hel...pdesk/help/techdoc/matlab_prog/f8-790895.html