SEPERATING CONNECTED COMPONENTS IN AN IMAGE

I have binarised an image and found all the connected components..now i have to find the largest connected component,its height to width ratio and its centroid..for that i had written a code but it is showing errors

[l,n]=bwconncomp(binaryimagename,8);
for   k1=1:n
      [r,c]=find(l==k1);
      rbar=mean(r(k1));
      cbar=mean(c(k1));
      r1(k1)=max(r(k1));
      c1(k1)=max(c(k1));
      r2(k1)=min(r(k1));
      c2(k1)=min(c(k1));
      len(k1)=r1(k1)-r2(k1);
      wid(k1)=c1(k1)-c2(k1);      
end

Answer 1

[Image Analyst]

Use regionprops for that. See my tutorial in my File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862