code algorithm

hi, i would like to know how these 2 script work??would anyone plz explain me briefly about the algorithm of codes?

here is the link of script:

http://mathworks.com/matlabcentral/fileexchange/31636-2d-polynomial-fitting-with-svd

Answer 1

[Walter Roberson]

The algorithm is shown in the description of that contribution.

If you are asking why SVD is suitable for fitting values, then that is not something that can be briefly explained. Have you studied SVD ?

[milad babaei]

i read that description, but i need more info. on how svd have done the best fit???