How can i select seed pixel based on intensity based similarity index (8 neighbour connectivity) ?

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I am using this code . The similarity index between two pixels of RGB image is calculated by euclidean distance. I want to show these seed pixels in original image... clear all img=imread('ldy.jpg'); figure, imshow(img); imggray=rgb2gray(img); bw=edge(imggray, 'log'); % figure,imshow(bw); imgc=imcomplement(bw); % figure, imshow(imgc); w=watershed(imgc); % figure, imshow(w); wrgb=label2rgb(w); b=zeros(256, 256); figure, imshow(wrgb); for i=1:256; for j=1:256; dr1=wrgb(i, j, 1)-wrgb(i, j+1, 1); dg1=wrgb(i, j, 2)-wrgb(i, j+1, 2);db1=wrgb(i, j, 3)-wrgb(i, j+1, 3); d1=sqrt(dr1*dr1+dg1*dg1+db1*db1); dr2=wrgb(i, j, 1)-wrgb(i-1, j+1, 1); dg2=wrgb(i, j, 2)-wrgb(i-1, j+1, 2);db2=wrgb(i, j, 3)-wrgb(i-1, j+1, 3); d2=sqrt(dr2*dr2+dg2*dg2+db2*db2); dr3=wrgb(i, j, 1)-wrgb(i-1, j, 1); dg3=wrgb(i, j, 2)-wrgb(i-1, j, 2);db3=wrgb(i, j, 3)-wrgb(i-1, j, 3); d3=sqrt(dr3*dr3+dg3*dg3+db3*db3); dr4=wrgb(i, j, 1)-wrgb(i-1, j-1, 1); dg4=wrgb(i, j, 2)-wrgb(i-1, j-1, 2);db4=wrgb(i, j, 3)-wrgb(i-1, j-1, 3); d4=sqrt(dr4*dr4+dg4*dg4+db4*db4); dr5=wrgb(i, j, 1)-wrgb(i, j-1, 1); dg5=wrgb(i, j, 2)-wrgb(i, j-1, 2);db5=wrgb(i, j, 3)-wrgb(i, j-1, 3); d5=sqrt(dr5*dr5+dg5*dg5+db5*db5); dr6=wrgb(i, j, 1)-wrgb(i+1, j-1, 1); dg6=wrgb(i, j, 2)-wrgb(i+1, j-1, 2);db1=wrgb(i, j, 3)-wrgb(i+1, j-1, 3); d6=sqrt(dr6*dr6+dg6*dg6+db6*db6); dr7=wrgb(i, j, 1)-wrgb(i+1, j, 1); dg7=wrgb(i, j, 2)-wrgb(i+1, j, 2);db7=wrgb(i, j, 3)-wrgb(i+1, j, 3); d7=sqrt(dr7+dg7+db7); dr8=wrgb(i, j, 1)-wrgb(i+1, j+1, 1); dg8=wrgb(i, j, 2)-wrgb(i+1, j+1, 2);db8=wrgb(i, j, 3)-wrgb(i+1, j+1, 3); d8=sqrt(dr8+dg8+db8); d=d1+d2+d3+d4+d5+d6+d7+d8; if d==0 b(i, j)=1; end end end imshow(b); Error is genrated: Error in seedpixelselection (line 17) d1=sqrt(dr1*dr1+dg1*dg1+db1*db1);

Undefined function 'sqrt' for input arguments of type 'uint8'.