If i am Computing similarity between input image and all database image.what do i have to change in bellow code

load('db.mat'); i=2;
second=['10' num2str(fix((i-1)/8)+1) '_' num2str(mod(i-1,8)+1)];
disp(['Computing similarity between ' filename ' and ' second ' from FVC2002']);
S=match(ffnew,ff{i},1);