% seems totally unnecessary now...

function DFSA = add_ddelta(DFSA,q,s,r)
% adds the transition (q,s)->r to DFSA
% note: it will override previous entries if they exist

[rr,ss] = get_ddelta(DFSA,q);
rr(end+1) = r;
ss(end+1) = s;
qq = ones(size(rr))*q;
DFSA = set_ddelta(DFSA,qq,ss,rr);

return