Plotting the updated values from if statement under for-loop

......................       % lines of code
......................       % lines of code
n = 70
dt = 0.1                     % 0.1second increment

for i = 1:n

      t = dt*(i-1);       % elapsed time                  
      .................   % lines of code
      .................   % lines of code
      if (condition) 

         tipper(A,B,r);   % calling a function called tipper that outputs delta_q

         elapsed_time = t

         plot(elapsed_time, delta_q)

      else

         fprintf('Not happening\n');

      end
end

Whenever the first condition is satisfied, I need to plot delta_q (output from a function called tipper) vs. elapsed_time for all i values from 1 to n (I believe there will be gaps in the plot where the 'Not happening' occurs). The 'plot(elapsed_time, delta_q)' part in the code doesn't seem to work.

Answer 1

[KSSV]

Use

   plot(elapsed_time, delta_q,'.')

instead of

   plot(elapsed_time, delta_q)

Note that you are plotting a single point at instance, so you should plot it by a marker. Also, you need to use hold on after the plot or, before the loop figure; hold on.

You have other way to achieve this, below is the pseudo code for that. I would suggest you to follow this method.

......................       % lines of code
......................       % lines of code
n = 70
dt = 0.1                     % 0.1second increment
xdata = NaN(1,n) ;
ydata = NaN(1,n) ;
for i = 1:n
      t = dt*(i-1);       % elapsed time                  
      .................   % lines of code
      .................   % lines of code
      if (condition) 
         tipper(A,B,r);   % calling a function called tipper that outputs delta_q
         elapsed_time = t ;
         xdata(i) = elapsed_time ;
         ydata(i) = delta_q ;
      else
         fprintf('Not happening\n');
      end
end

plot(elapsed_time, delta_q)

[Fiona Rae]

Thank you!