I Want To Obtain The Eigenfaces For That I Reached Upto The Covarience Matrix Stage But It Is Also Not Working I Dont Undstand How To Resolve It Plz Help Me..Following Is The Code

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MatLab

clear all;
clc;

for i=1:10
img =imread(['C:\Users\shree\Desktop\archana\final 50\boys\11\' num2str(i) '.jpg']);
evalc(['o' num2str(i) '=img;']);
evalc(['g' num2str(i) '=rgb2gray(img)']);
evalc(['r' num2str(i) '=imresize(g',num2str(i),',[50 50]);']);
end

imshow(r5);
%converting gray image to single vector(fi)
a1=r1(:); %column vector

a2=r2(:); %column vector

a3=r3(:); %column vector

a4=r4(:); %column vector

a5=r5(:); %column vector

a6=r6(:); %column vector

a7=r7(:); %column vector

a8=r8(:); %column vector

a9=r9(:); %column vector

a10=r10(:); %column vector

%mean computation
M=[a1+a2+a3+a4+a5+a6+a7+a8+a9+a10]/10;
imshow(M);

% subtracting mean face
s1=a1-M;
s2=a2-M;
s3=a3-M;
s4=a4-M;
s5=a5-M;
s6=a6-M;
s7=a7-M;
s8=a8-M;
s9=a9-M;
s10=a10-M;

% computing transpose of vectors
A1=a1.';
A2=a2.';
A3=a3.';
A4=a4.';
A5=a5.';
A6=a6.';
A7=a7.';
A8=a8.';
A9=a9.';
A10=a10.';



% computing covarience matrix
C=[a1*A1+a2*A2+a3*A3+a4*A4+a5*A5+a6*A6+a7*A7+a8*A8+a9*A9+a10*A10]/10;