Where can I download or undrestand the SVD++ code in MATLAB?

I want to do some calculation using SVD++. I already have a SVD code and I update it using Latent Semantics Analysis (LSA). How can I update it to SVD++?

A = [..................................]
[U, S, V] = svd(A)
VP = V.'
AR = U * S * VP

U2 = U(:,1:2)

S2 = S(1:2,1:2)

VP2 = VP(:,1:2)
V2 = VP2.'

A2 = U2 * S2 * V2