Specifying elements of a structure array that have different fields

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Martin
Martin 2014-6-5
评论： José-Luis 2014-6-5
Hello -
I'm using a structure array to describe a set of particles that can have very different properties. I've found that by creating a structure field for each element of the array, I can then add specific fields that may not be shared by all members of the array:
particle(1).type = 'human';
particle(1).properties.name = 'Barney';
particle(1).properties.gender = 'm';
particle(1).properties.weight = 190.0;
particle(2).type = 'vehicle';
particle(2).properties.model = 'Camry';
particle(2).properties.weight = 3000.0;
particle(2).properties.length = 14.0;
Is this permissible to do? Thanks.

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回答（1 个）

José-Luis
José-Luis 2014-6-5
编辑：José-Luis 2014-6-5
To get a logical index into all 'human':
humanIdx = cellfun(@(x) strcmp('human',x),{particle(:).type})
Please accept an answer if it helped you.
  2 个评论
Martin
Martin 2014-6-5
I think I was confusing. I am just wondering if it is OK to build such structure arrays with different fields in a substructure, or whether this will cause some kind of problem
José-Luis
José-Luis 2014-6-5
Yes you can. Accessing stuff will lead to tricky syntax, but is doable as shown above.
What is your ultimate purpose? Build a database? If so, then Matlab is really not the right tool for the job.

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