implementation of an LMS adaptive filter in matlab

How does 'adaptfilt.lms' work in matlab? Anybody knows what the structure of the filter will be when we create and use

mu = 0.09; % LMS step size ha = adaptfilt.lms(32,mu); [y,e] = filter(ha,x,d); where d-desired output, x-actual output?

x and d are of size 2048 x 1,

i need the structure of the filter.