index must be a positive integer or logical

Attempted to access Connected(0,936); index must be a positive integer or logical.

Error in ==> coc at 36 cc=Connected(i-1,j);

anyone knows how to solve this ??

Answer 1

[Azzi Abdelmalek]

You can not use 0 as index, it must be 1,2,3,... or logical(1) and logical(0)

[Shahd Ewawi]

I started the 2 for loops from 1 I don't know why it started from 0

for i=1:r
  for j=1:c
      p=bwZ(i+1,j+1);
      if(p==1)    %foreground pixel "white!"..
          top=bwZ(i,j+1);
          left=bwZ(i+1,j);

            if(~top && ~left)
                cc=mark;
                equivalence(cc)= max(equivalence)+1;
                mark=mark+1;
            else if(top && left )
                    cc=Connected(i,round(j-1));
                    if(equivalence(Connected(i-1,j)) ~= equivalence(Connected(i,j-1)))
                        equivalence(Connected(i,j-1)) = equivalence(Connected(i-1,j));
                    end
                else if(left)
                        cc=Connected(i,j-1);
                    else
                        if(top)
                            cc=Connected(i-1,j);
                        end
                    end
                end
            end
            Connected(i,j)=cc;
        end
    end
end

[Azzi Abdelmalek]

cc=Connected(i-1,j)

If i start from 1 then i-1 start from 0

[Shahd Ewawi]

thanks for your help