how to form the code for fixed value and variable value

the code which i need help:

i=1:10;
j=1:20,1:40,1:60,1:80,1:100,1:120;
G(i,j);

Code:

siz = size(G); 
idx = sub2ind(siz, randi([1,10], 1, siz(2)), 1:siz(2)); 
C = zeros(siz); 
C(idx) = G(idx);

in the above code the value of i=1:10,j=1:20. how to modify the code such that when the code runs second time i=1:10 and j=1:40,when the code runs for the next time i=1:10 and j=1:60 and it goes on.

[Star Strider]

NOTE:

Duplicate of: https://www.mathworks.com/matlabcentral/answers/370126-how-to-form-the-code-for-i-10-and-j-20-40-60-80

[Prabha Kumaresan]

sorry to ask the question twice please help me to get the solution of it

[Prabha Kumaresan]

i havent received any answers for the above asked questions.

[per isakson]

See TUTORIAL: how to ask a question (on Answers) and get a fast answer

Tip: Use the Help and learn how to make code readable. This time I clicked the {}Code button.

Answer 1

[Walter Roberson]

persistent number_times_run
if isempty(number_times_run); number_times_run = 0; end

number_times_run = number_times_run + 1;
i = 1:10;
j = 1 : 20 * number_times_run;