Using matfile objects as input parameters

2013 7 12
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I was wondering if a matfile object can be used as an input parameter for any matlab function, like in the following example:
distances = matfile(output_file,'Writable',true);
distances.D = zeros(1,N*(N-1)/2);
%Compute distances and store them in distances.D
% Applying multidimensional scaling to the distances matrix
[Y,eigvals] = cmdscale(D);
Is that possible? What about operators like distances.D*distances.D? Or should I reimplement matlab functions and operators again if I am using this kind of objects?

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per isakson
per isakson 2013-7-12
编辑：per isakson 2013-7-12

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Yes, it is ok to pass around matfile objects, matObj; make some simple experiments.
I don't think the documentation says anything about several different matObj, which refer to the same file at the same time.

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Pablo
Pablo 2013-7-14
Thank you for your answer.
What if the invoked method (like cmdscale in my example) has to return a huge array? Let's suppose that there is not enough space in memory for that returned array. Is it any way to make it use matfile objects?
per isakson
per isakson 2013-7-14
Speculation: There should be "no difference" between
distances.D = zeros(1,N*(N-1)/2);
and
[ matObj.Y, eigvals ] = cmdscale(D);
Make an experiment to find out how smart matfile is with large variables.

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