I want to initialize class variables through array type class object using a function

%%% Code for my class Nodes.m%%%%%%%%%%

classdef Nodes
      % Detailed explanation goes here
      % The node class contains the properties of each node

    properties (SetAccess = public)
        NodeID
        x
        y
        p=dlnode
        noNodes = 100
        uid = (1:100)
        InitialEnergy 
        ResidualEnergy 
        mark=0
        NodeStatus;
        Distance
        Dst

    end
end

%%%%%%%creating array type class object%%%%%

n(1, noOfNodes)= Nodes;

%%%%%%Function to initialize class variables%%%%

function Initialize( n,i,noOf Nodes)

for i=1:noOfNodes
  n(i).NodeID=i;
  x=rand();                %j;
  y=rand();                %k;
  n(i).x= x;
  n(i).y= y;
  n(i).InitialEnergy=2400.0;
  n(i).NodeStatus=0;
  n(i).mark=0;
  n(i).ResidualEnergy=n(i).InitialEnergy;
   n(i).NodeID= num2str(i); 
end
end 

%%%%%%%script file Test.m to call initialize funtion%%%%%%

clc;
clear;

% Initialization of Global Variables
Initialize( n,i,noOfNodes);

n = Nodes;
noOfNodes = 35;  %No. of Nodes
n.noNodes = noOfNodes;
NG = 3; %No. of Geocst Regions
GX = 500; % Maximum Value of x-coordinate
GY = 500; %Maxium Value of y-coordinate
LX = 0; % Minimum Value of x-coordinate
LY = 0; % Minimum Value of y-coordinate

The problem here is that though the variables get initializes using the function but they are not being stored in the work space. If I display them in the function I get the value but if work space the variables are not getting any values.

[jyoti Kaurav]

ohk

Answer 1

[Matt J]

becuase Initialize is not returning any output argument to the workspace. You need this instead

 n = Initialize( n,i,noOfNodes);

and

function  n = Initialize( n,i,noOf Nodes)

    .....

end

Incidentally, it is curious that you do not define a class constructor, choosing instead to use the external function Initialize().

[Andrew Newell]

Good point about using the constructor. For some reason the first two answers weren't visible when I added mine.

Answer 2

[Andrew Newell]

The main problem is that in the command

Initialize( n,i,noOfNodes);

the output isn't assigned to n. You need

n = Initialize( n,noOfNodes);

Note that I have removed i from the list of arguments, because i is an internal variable. Also, you assign values to NodeID twice inside the loop:

n(i).NodeID=i;
...
n(i).NodeID= num2str(i);

Which one do you want?

It's a good idea to make Initialize a method, as follows:

classdef Nodes
    % Detailed explanation goes here
    % The node class contains the properties of each node
  properties (SetAccess = public)
      NodeID
      x
      y
      p=dlnode
      noNodes = 100
      uid = (1:100)
      InitialEnergy 
      ResidualEnergy 
      mark=0
      NodeStatus;
      Distance
      Dst
  end
  methods
      function n = Nodes(noOfNodes)
          if nargin > 0
              for i=noOfNodes:-1:1
                  n(i).NodeID=i;
                  n(i).x= rand;
                  n(i).y= rand;
                  n(i).InitialEnergy=2400.0;
                  n(i).NodeStatus=0;
                  n(i).mark=0;
                  n(i).ResidualEnergy=n(i).InitialEnergy;
              end
          end
      end
  end
end

Then you could run it using commands like this:

noOfNodes = 35;
n = Nodes(noOfNodes);

[Andrew Newell]

I modified the code in view of Matt J's answer.