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function pot = mk_initial_pot(pot_type, dom, ns, cnodes, onodes)
% MK_INITIAL_POT A "initial" potential is one which has not had any evidence entered into it.
% pot = mk_initial_pot(pot_type, domain, node_sizes, cnodes, onodes)
%
% pot_type is one of 'd', 'g', 'cg' or 'u'
% domain is the set of nodes to be included in the potential.
% node_sizes(i) is the size of node i.
switch pot_type
case 'd',
ns(onodes) = 1;
pot = dpot(dom, ns(dom));
case 'u',
ns(onodes) = 1;
pot = upot(dom, ns(dom));
case 'g',
ns(onodes) = 0;
pot = cpot(dom, ns(dom));
case 'cg',
dnodes = mysetdiff(1:length(ns), cnodes);
ddom = myintersect(dnodes, dom);
cdom = myintersect(cnodes, dom);
dobs = myintersect(dnodes, onodes);
cobs = myintersect(cnodes, onodes);
ns(dobs) = 1;
ns(cobs) = 0;
pot = cgpot(ddom, cdom, ns);
end
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