Index exceeds array bounds error in nested for loop

Hi,

When I run a script, I get the following error:

"Index exceeds array bounds.

Error in Test1 (line 12)

B{j} = imadd(A{x},A{x+1});"

Both the arrays are of the same dimensions. I am trying to add 2 consecutive images and then fusing the resulting images. Where am I going wrong and how do I fix this?

Here is the code:

N = 8; %Number of Images
i = N - 1; %Number of iterations needed
A = cell(1,N); %Input array of images
B = cell(1,N); %Holds result of added images
Image = imread('1.png');
for z = 1:8
    A{z} = imread(sprintf('%d.png',z));
end
if (i~=0)
    for x=1:1:i
        for j=1:1:(N/2)
            B{j} = imadd(A{x},A{x+1});
            x = x+2;
        end
    end
    for y=1:1:(N/2)
        Image = imfuse(Image,B{y},'blend');
    end
else
    disp('Error: Minimum of 2 images needed');
end

[Guillaume]

Ignoring the fact that x goes out of bound indeed as pointed out by Alex Mcaulley, the double for loops doesn't make any sense.

for x = 1:i
    for j = 1:N/2
        B{j} = something;
    end
end

At x=1, you fill B{1:N/2} with some values. At x=2, you overwrite all these values with possibly new ones, etc. At the end, the code is simply equivalent to

x = i;  %what badly named variables these are!
for j = N/2
    B{j} = something
end

Answer 1

[Alex Mcaulley]

The length of A is 8. In this loop

for x=1:1:i
        for j=1:1:(N/2)
            B{j} = imadd(A{x},A{x+1});
            x = x+2;
        end
end

x is going upper than 8, then gives an error.

[Swetha Varadharajan]

Yes, I see it now.

Thanks for your help!

[Adam Danz]

@Alex Mcaulley, you could move your comment to the answers section. That way the question appears as answered.