Counter not working in for loop

I have a counter in a for loop like this:

x = 0;
for i = 1:10
    x = x+1;
    % code that uses the counter
end

However, when I was debugging and removed the semicolon from the x = x+1 statement I get:

x =

0×1 empty double column vector

When I debugged and used disp(i) and disp(x), it would only display the value of i and not x. Does anyone know how to fix this?

[Mark Sherstan]

Do you have a clear workspace? I dont see anything wrong with that statment and it works fine on my machine.

[Kevin Phung]

it also seems like x is just equivalent to i in every iteration, have you considered just using i?

[Ranjani Shankar]

the for loop is actually a nested for loop and x is a counter for every iteration of both for loops

Answer 1

[Star Strider]

We cannot see the ‘code that uses the counter’. Check to see if your code is somehow clearing ‘x’ or setting ‘x’ to [].

[Ranjani Shankar]

A simplistic version of the code is:

array(x, 1) = i;
x = x+1;
array(x, 1) = i+1;
x = x+1;
%and so on

So it shouldn't be clearing x or setting it to [].

Also, it works when I type the code in the command window but just not when I run it as the function it is in.

[Star Strider]

‘So it shouldn't be clearing x or setting it to [].’

It is obvious that something is clearing it. I suggest that you use the debugging tools to see what ‘x’ is doing, and where.

[Ranjani Shankar]

do you have any suggestions for debugging tools other than the ones I've mentioned using?

[Star Strider]

Yes. Specifically: Debug a MATLAB Program (link).