how can plot error with number of iteration?

when used (while loop) as stopping condition of process ,we specified the value of error may be 0.001 or 0.00001

if I have number of iteration ,How can plot the error with iteration numbers?

[Azzi Abdelmalek]

This is not clear

[Mary Jon]

 if I have 120 iteration ,how can plot its

this code of error ,

 [i j]=ndgrid(1:111,1:33); 
G=(sum(sum((abs(v_now-v_prev))))); 
MPD=G/(m*n);                           %error stoping criteria 

 while(MPD>0.00001);    %Run this until convergence

Answer 1

[Azzi Abdelmalek]

[i j]=ndgrid(1:111,1:33);
MPD=1;
while(MPD>0.00001);
  G=(sum(sum((abs(v_now-v_prev)))));
  MPD=G/(m*n);
  % your code
end

[Mary Jon]

Now I get axises empty without any plot,when I am used plot command

plot(MPD,iter)

there are value of MPD to each iteration ?isnt it?

Why there is no plotting?

[Azzi Abdelmalek]

hold on
plot(MPD,iter)

[Mary Jon]

 I get axises empty without any plot, again

[Azzi Abdelmalek]

Show your code

[Mary Jon]

all code Or the part that deal with problem

[Azzi Abdelmalek]

Just the part

[Mary Jon]

iter=0; 

 [i j]=ndgrid(1:111,1:33); 
MPD=1;
G=(sum(sum((abs(v_now-v_prev))))); 
MPD=G/(m*n);                           %error stoping criteria 

 while(MPD>0.00001);    %Run this until convergence

 iter=iter+1; % Iteration counter increment

 hold on
plot(MPD,iter) 

 end
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%end of code %%%%%%%%%%%%

[Azzi Abdelmalek]

You are not doing anything inside the loop. Try

iter=0; 
MPD=1;
while(MPD>0.00001);    %Run this until convergence
  G=(sum(sum((abs(v_now-v_prev))))); 
  MPD=G/(m*n);                           %error stoping criteria 
  iter=iter+1; % Iteration counter increment
  hold on
  plot(iter,MPD) 
end