Can I use a Proc step within another proc step?

Question

I am writing an nlmixed procedure, and for the likelihood function, I want to use values generated with the iml procedure. So I am wondering if there is a way of using proc iml inside a proc nlmixed.

proc nlmixed data = xxx;
  parms b0=0 b1=0;
  mu = exp(b0 + b1*Age);
  ll = log(((mu**y)*exp(-mu))/gamma(y+1));
  model y~ general(ll);
run;

proc iml;
  v = {5,6,7,8,9,10,11,12,13,14};
  z = j(10,1,.);
  do i = 1 to 6;
    z[i] = ((v[i]-5)/5)*((mu**v[i])*exp(-mu))/gamma(v[i]+1);
  end;
  ll=log(sum(z));
quit;

The idea is to:

• use mu from nlmixed inside the proc iml
• but the ll from both steps should be inside nlmixed