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function p = find_equiv_posns(vsmall, vlarge)
% FIND_EQUIV_POSNS p[i] = the place where vsmall[i] occurs in vlarge.
% p = find_equiv_posns(vsmall, vlarge)
% THE VECTORS ARE ASSUMED TO BE SORTED.
%
% e.g., vsmall=[2,8], vlarge=[2,7,8,4], p=[1,3]
%
% In R/S, this function is called 'match'
%if ~mysubset(vsmall, vlarge)
% error('small domain must occur in large domain');
%end
if isempty(vsmall) || isempty(vlarge)
p = [];
return;
end
bitvec = sparse(1, max(vlarge));
%bitvec = zeros(1, max(vlarge));
bitvec(vsmall) = 1;
p = find(bitvec(vlarge));
%p = find(ismember(vlarge, vsmall)); % slower
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