Index exceeds matrix dimensions

Can't seem to figure out what's wrong with this code. The error points to the 3rd line of code here:

for ele = 1:n
    for i=1:4
        x(i,1)=xc(elems(ele,i),1);
        y(i,1)=yc(elems(ele,i),1);
    end
end

In case you're wondering, here are the sizes of all matrices involved:

x: 4x1
y: 4x1
xc: 2601x1
yc: 2601x1
elems: 2500x4

Also, the highest value returned by elems(ele,i) is 2601 and the lowest is 1 . Everything else is an integer between 1 and 2601, which are all permissible indices for xc. Any thoughts on this?

[Walter Roberson]

What is n ?

Each iteration of "for ele" you overwrite all of x, so provided you do not run into errors, the end result would be the same as if only the final ele were run,

ele = n;
for i=1:4
  x(i,1)=xc(elems(ele,i),1);
  y(i,1)=yc(elems(ele,i),1);
end

[Rahul Pillai]

Hey Walter. Thanks for replying. Ele is not a problem here. It's a value that needs to change since xc and yc are a huge system of coordinates for some some units called 'nodes' that all exist in groups of 4. There are 'n' such groups and they all exist inside ele. There are thus, n such groups, where n=2500. I have made sure n is predefined to be 2500 in size. (hence ele is size 2500 x 4) .

[Rahul Pillai]

Hello. I seem to have figured the problem. I apparently changed the value of xc somwhere inside the ele for loop code block (I haven't shown it here as I thought this was the most important line of code that was affecting my answer). Thanks though!