Array Manipulation..

Hi,

I have asked one question regarding a simple decrement of an array yesterday and got a good response. Today i am trying to manipulate that array further but i am kind of stuck in between loops and condtions. I am new to Matlab

It goes like this i am trying to decrement an array and once any particular element of that array arrives at zero, i am assigning that element as well as its immediate neighboring element with some value. What i need is that once that assigned value arrives at zero, it will increase the counter value by 1.

close all
clear all
clc

n               =   [11 12 13 24 3 7 14 11 12];
n_indx          =   zeros(1,12);
recv_count      =   0;   
send_count      =   0;            
send_count_1    =   zeros(1,12);
recv_count_1    =   zeros(1,12);

      for i=1:40   % Just a loop so that the program can run for long (Not good programming practice)
      while any(n)

          n           =   max(0,n-1)  
          n_indx      =   find(n==0)  
          n(n_indx)   =   3           ;  % Assigning the value of "3" to the element that become zero
          send_count_1(n_indx)=send_count+1 ; % Once an element become zero it should be recorded in this array at the same index

          if (n(n_indx+1)>0)  % Checking if the neighboring element is greater than zero

              n(n_indx+1)=3   % Assigning the vlaue of "3" to the neighboring element

              if (n(n_indx-1)>0) % Checking if the other neighboring element is also greater than zero

               n(n_indx-1)=3  % Assigning the vlaue of "3" to the other neighboring element

          % Now what i want is if all three elements (n_indx) && (n_indx+1)
          % && (n_indx-1) are zero at the same point, they should be recorded
          % into another counter

          if (n(n_indx)==0) && (n(n_indx+1)==0) && (n(n_indx-1)==0)

              recv_count_1(n_indx+1)=recv_count+1;
              recv_count_1(n_indx-1)=recv_count+1;

          % This gives me an error(That they are not scalar and i think they are scalar values).

                  break               

                      end

                  end

      end

      end 
      end

[Mustafa]

Sorry for poor indentation and comments.

If the array goes out of dimensions or a problem of subscript occurr, dont worry about it. I will fix that

Answer 1

[Vidhi Agarwal]

Hi Mustafa,

I assume you are encountering some issues with your code. Following is the attached code giving required output.

n = [11 12 13 24 3 7 14 11 12];
processed = false(size(n));  % Array to keep track of processed elements
recv_count = 0;   
send_count = 0;            
send_count_1 = zeros(size(n));
recv_count_1 = zeros(size(n));

for i = 1:40  % Loop to run the program for a long time
    while any(n > 0)
        n = max(0, n-1);
        n_indx = find(n == 0 & ~processed);  % Find indices where n is zero and not processed
        
        % Iterate over each index where the element is zero
        for idx = n_indx
            if n(idx) == 0 && ~processed(idx)  % Ensure the element is still zero and not processed
                n(idx) = 3;  % Assigning the value of "3" to the element that becomes zero
                send_count = send_count + 1;  % Increment the send counter
                send_count_1(idx) = send_count;  % Record the zero element in this array
                processed(idx) = true;  % Mark as processed
                
                % Check and assign value to the neighboring elements
                if idx > 1 && n(idx-1) > 0
                    n(idx-1) = 3;
                end
                if idx < length(n) && n(idx+1) > 0
                    n(idx+1) = 3;
                end
            end
        end
        
        % Now check if all three elements (n_indx), (n_indx+1), and (n_indx-1) are zero
        for idx = n_indx
            if idx > 1 && idx < length(n) && n(idx) == 0 && n(idx+1) == 0 && n(idx-1) == 0
                recv_count = recv_count + 1;  % Increment the receive counter
                recv_count_1(idx) = recv_count;
                recv_count_1(idx+1) = recv_count;
                recv_count_1(idx-1) = recv_count;
            end
        end
    end
end

disp('send_count_1:');
disp(send_count_1);
disp('recv_count_1:');
disp(recv_count_1);

Hope that helps!