dynamic array of objects in Matlab

Question

I have created this two codes classes.

classdef master < matlab.mixin.Copyable


  properties
      id
      list
   end
   methods
        function this=master(id)             
            if nargin > 0
                this.id = id;
                this.list = repmat(msg,1,20);
            end
        end 
   end
end

classdef msg < matlab.mixin.Copyable


 properties
      id
      dest
      ttl
   end
   methods
        function this=msg(id,dest,ttl)             
            if nargin > 0
                this.id = id;
                this.dest = dest;
                this.ttl = ttl;
            end
        end 
   end
end

In another part of my code I try to delete one or more objetc "msg" from array "master.list" using the following:

   function verifyMsgToDiscard(this,t)
        i = 1;
        while (i <= numel(this.list))
            m = this.list(i);
            if (t > m.ttl)
               this.list = this.list(this.list~=m); %remove m of the list
               clear m; %delete m from the system
            end 
            i= i + 1;
        end
    end

I am getting the error:

Index exceeds matrix dimensions.

Error in master/verifyMsgToDiscard (line 117) m = this.list(i);

The problem I think is why I am iterating over the master.list in the same time I modify the number of elements on it. In addition I can add and remove new objects "msg" in the "list" then its size varies. How I can do this in a dynamic way.

kyamagu · Accepted Answer · 2014-03-27 19:17:32Z

1

I suppose you're trying to remove msg objects having ttl to be smaller than t. This is the Matlab way of removing elements:

this.list = this.list(t <= [this.list.ttl]);

Note that t <= [this.list.ttl] generates a logical index.

answered Mar 27, 2014 at 19:17

kyamagu

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