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copied!<p>You need to ensure that the data passed from MATLAB to Java can be properly converted. See MATLAB's <a href="http://www.mathworks.com/help/pdf_doc/matlab/apiext.pdf" rel="nofollow noreferrer">External Interfaces document</a> for the conversion matrix of which types get converted to which other types.</p> <p>MATLAB treats most data as pass-by-value (with the exception of classes with handle semantics), and there doesn't appear to be a way to wrap a structure in a Java interface. But you could use another HashMap to act like a structure, and convert MATLAB structures to HashMaps (with an obvious warning for multiple-level structures, function handles, + other beasts that don't play well with the MATLAB/Java data conversion process).</p> <pre><code>function hmap = struct2hashmap(S) if ((~isstruct(S)) || (numel(S) ~= 1)) error('struct2hashmap:invalid','%s',... 'struct2hashmap only accepts single structures'); end hmap = java.util.HashMap; for fn = fieldnames(S)' % fn iterates through the field names of S % fn is a 1x1 cell array fn = fn{1}; hmap.put(fn,getfield(S,fn)); end </code></pre> <p>a possible use case:</p> <pre><code>>> M = java.util.HashMap; >> M.put(1,'a'); >> M.put(2,33); >> s = struct('a',37,'b',4,'c','bingo') s = a: 37 b: 4 c: 'bingo' >> M.put(3,struct2hashmap(s)); >> M M = {3.0={a=37.0, c=bingo, b=4.0}, 1.0=a, 2.0=33.0} >> </code></pre> <p>(an exercise for the reader: change this to work recursively for structure members which themselves are structures)</p>

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