Index exceeds the number of array elements (1).

Hello ,

Can someone tell me where am I wrong here? I am retrieving only 1024 values from 3072 after comparing each row from 3 same columns.

w = zeros(1, 1024);;%1024 length
l=length(h_im);
x=4;
y=2;
for k = 1 : numel(h_im)
a =zeros(1, 4096);
end
for i = 1 : numel(d)
  dl = zeros(1, numel(W)); length %1024
    for h =1:3
        if a(i*3+h)>0 %%%% error is here
            dl = dl+1;
        else
            dl = dl-1;
        end
    end
end

[Ive J]

You already answered yourself I guess: 3072 > 1024. Your first loop counter cannot go above numel(w_im).

Btw, your first loop doesn't do anything, you loose a after each loop execution.

[marie lasz]

Yes I know but I need only 1024 values , i have 3 columns anfd 1024 rows = 3072 values now i want to compare each row and extract one value .

[marie lasz]

even by making length equal in each loop still gives this error

Answer 1

[Image Analyst]

for k = 1 : numel(h_im) % the length is 3072
    a(k) = w_im{k}(x,y) - h_im{k}(x,y);
end

and

        if dl > 0
            w(i) = 1;
        else
            w(i) = 0;
        end

simplifies to

        w(i) = double(dl > 0); % Double is not necessary if you're happy with w as a logical.

[marie lasz]

actually from 3072 values i have to extract 1024 values by comparing each row's values. If I apply this simplified code it wiull give me 3072 values.

[Image Analyst]

Hard to say until you supply us with the variables you are starting with in a .mat file with the paper clip icon.

save('answers.mat', 'w_im', 'h_im', 'W');

[marie lasz]

w_im=1x3072 cell

h_im=1x3072 cell

W=32x32 logical

[marie lasz]

I solved the problem. thank you for your time :-)

[Rik]

Next time, please try to post a minimal working example. That means you post as much code as is needed to result in the unwanted behavior, but not more.

You should also do yourself a favor: write comments. I tend to suggest that half of your m file should be green. That is probably too much, but if you really try to explain the purpose of every line, you will make it a lot easier for others to read your code. In two weeks you will be unable to understand what you did here.