Linear Least Squares problem

[antiseptic]

hi all
i am trying to minimize some matrix H using lsqnonneg (linear least square with non negativity constraint)

however, lsqnonneg accepts only vectors as inputs, not matrices, so i am forced to do this

for i=1:size(V,2)
H,i) = lsqnonneg(-W, -V,i))
end

this is extremely time consuming, i wish i could do some thing like

H = lsqnonneg(-W, -V) so it d do the iteration faster

but lsqnonneg wont let me

is there any way to avoid the "for" or i am doomed to spend the next week waiting till it converges

regards