array of objects

Question

Christof 2012-6-19

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/41535-array-of-objects

Hi, have a class like this

   classdef someClass
      properties
         name
         value
       end
      methods
         function obj = someClass(name)
            obj.name(name)
      end
   end

I would like to create an array of objects of that class. So if I have the names= ('a','b','c') I would like to have an array a of 3 objects with a(1).name='a' a(2).name='b' a(3).name='c'

how do I have to structure my constructor to achieve this by calling

a(1:numel(names))=someClass(names)

or how can I do this in another halfway smart way. Thanks, C

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Answer 1

Titus Edelhofer 2012-6-19

3
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https://ww2.mathworks.cn/matlabcentral/answers/41535-array-of-objects#answer_51158

在 MATLAB Online 中打开

Hi,

something like this?

classdef someClass
  properties
      name
      value
  end
  methods
      function obj = someClass(name)
          if ~nargin
              % the default constructor. Needed for array creation
              obj.name = '';
          else
              % only take care of the array part for simplicity:
              if iscell(name)
                  [obj(1:length(name)).name] = deal(name{:});
              end
          end
      end
  end
end

You can call then as

a = someClass({'a' 'b' 'c'});

Titus

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Sean de Wolski 2012-6-21

Nice Titus, learn something every day!

Kye Taylor 2012-6-21

When I debug, I see that the first call is with input, and the second call is without. Is my debugger being fishy, or is something nonconstant across machines?

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