MATLAB: Error: Index Exceeds Matrix Dimensions. Please Help

errorindex exceeds matrix dimensionsoop

Hi,

I have simplified my problem, in the code below. Basically, every time I run this code, and request function "pos" with the following command:

a=class
a.pos

I receive the following error:

Index exceeds matrix dimensions.
Error in c/pos (line 15)
            p=obj.x(m)

Hopefully someone can tell me what I am doing wrong. Thank you.

   classdef class<handle
      properties
          m=[];
          x=[];
      end
      methods
          function obj=c()
          end
          function [x,m]=pos(obj)
              x=[2 3]
              m=[1]
              p=obj.x(m)
          end      
      end
  end

Best Answer

You assigned [2 3] to the local variable x, not to obj.x . obj.x is still its initial value []

Related Solutions

MATLAB: Can I make MATLAB use a custom copy method when creating an array of the class

It seems like subsasgn() https://www.mathworks.com/help/matlab/ref/subsasgn.html could be helpful in this case. You can control the assignment behavior. The following code shows a very crude example. You can adapt and improve it according to your requirement

classdef Problem_Class < handle
    properties (SetObservable = true)
        Prop1
    end
    methods
        function s = Problem_Class
            s.Prop1 = Prop1_Class;
        end
        
        function A = subsasgn(A, S, B)
            n = S(2).subs{:};
            m = numel(A.Prop1);
            num_new_elem = n-m;
            if num_new_elem > 1
                for i=1:num_new_elem-1
                    A.Prop1(m+i).Prop2.Name = '';
                end
                A.Prop1(m+num_new_elem).Prop2.Name = B;
            else
                A.Prop1(n).Prop2.Name = B;
            end
        end
    end
end

Example

problem = Problem_Class;
problem.Prop1(1).Prop2.Name = 'index 1'; % the current definition of subsasgn requires to use index (1) for first element too
problem.Prop1(8).Prop2.Name = 'index 8';
problem.Prop1(5).Prop2.Name = 'index 7';
x = [problem.Prop1.Prop2]; 
{x.Name}'

Output

ans =
  8×1 cell array
    {'index 1'}
    {1×0 char }
    {1×0 char }
    {1×0 char }
    {'index 7'}
    {1×0 char }
    {1×0 char }
    {'index 8'}

MATLAB: Using find() on a vector of objects

do you want:

p = find ( [obj.x] == 1 )

if not, as suggested earlier can you show obj.x and the error message you get.

Best Answer

Related Solutions

MATLAB: Can I make MATLAB use a custom copy method when creating an array of the class

MATLAB: Using find() on a vector of objects

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