function ndx = hash_del(key, fname)% HASH_DEL Remove all entries that match key  from hashtable stored in a file% ndx = hash_del(key, fname)%% Returns indices of matching entries (if any)% See hash_lookup for an examplendx = [];if ~exist(fname, 'file')  % new hashtable - no opelse  %hashtable = importdata(fname);  %hashtable = load(fname, '-mat');  load(fname, '-mat');  Nentries = length(hashtable.key);  for i=1:Nentries    if isequal(hashtable.key{i}, key)      ndx = [ndx i];    end  end  hashtable.key(ndx) = [];  hashtable.value(ndx) = [];  save(fname, 'hashtable', '-mat');end