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function hash_add(key, val, fname)
% HASH_ADD Append key,value pair to end of hashtable stored in a file
% function hash_add(key, val, filename)
%
% See hash_lookup for an example
if ~exist(fname, 'file')
% new hashtable
hashtable.key{1} = key;
hashtable.value{1} = val;
else
%hashtable = importdata(fname);
%hashtable = load(fname, '-mat');
load(fname, '-mat');
Nentries = length(hashtable.key);
hashtable.key{Nentries+1} = key;
hashtable.value{Nentries+1} = val;
end
save(fname, 'hashtable', '-mat');
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