Guide me through the steps of nnmf..

Hello

im making a project on face recognition software using facial intensity path and non negative matrix factorization.. this is my function

[Wa, Ha] = nnmf(C,1); % C is dataset containing all images

Wa Ha

W = a1/Wa ; % a1 is x -axis of my testing image

H= b1/Ha' ; % b1 is y -axis of my testing image

dis=pdist2(C',b1'); % calculating nearest distance pairwise b/w 2 observations

i have done till here , now please tell me the steps after this .. i have to perform comparison b/w testing image and whole database

thanks