Trying to create a natural log animation plot that shows the data points using the delay function

I came across an interesting code yesterday that created a natural log plot that used the delay function to plot the points of the graph slowly. Unfortunately I can not find this code and have been trying to replicate it on my own. As of now I have the following

x = (0:0.2:10); 
y = log(x);
delay (0:0.1);
for i = 1:numel(x)
      plot(i,y(i));
      drawnow
end

However this code is not working and I'm a bit rusty at coding in matlab and would really appreciate some help.

Thank you

[Alexander]

I found the code again on stackoverflow and I give all credit to a Jacob.

 clear all; clc;
x = 1:0.2:100;
y = log(x);
DELAY = 0.0001;
for i = 1:numel(x)
    clf;
    plot(x,y)
    hold on;
    plot(x(i),y(i),'go');
    pause(DELAY);
end

Answer 1

[Alexander]

 All credit to Jacob on stackoverflow
 clear all; clc;
x = 1:0.2:100;
y = log(x);
DELAY = 0.0001;
for i = 1:numel(x)
    clf;
    plot(x,y)
    hold on;
    plot(x(i),y(i),'go');
    pause(DELAY);
end

Answer 2

[Walter Roberson]

Perhaps you are thinking of something like

x = (0:0.2:10); 
y = log(x);
xlim([x(1), x(end)]);
ylim([-4, y(end)]);
hold on
for i = 1:numel(x)
      plot(x(i),y(i), '*');
      pause(0.1);
end

[Alexander]

Thank you for the reply, this is very similar to what I came across the other, however the code I am trying to replicate had used the delay function which allowed me to speed up and slow down the animation. Also there was a line graphed onto the plot as well and there was a single star that followed the line plot from the limits.

[Walter Roberson]

I was not able to find any function named "delay" in any of the toolboxes. I found Delay blocks for Simulink, and Delay having to do with some signal processing, but nothing that would affect animation. Is it possible you were looking at something that used PsychTools, the toolbox for psychometric experiments?

[Alexander]

I don't believe so, it was just an animated line for a log function. There is a code called animatedline, but the version of matlab I use here at school doesn't have it installed.

The following solution has something similar to what I am trying to accomplish. http://www.mathworks.com/matlabcentral/answers/243381-animate-line-but-show-marker-only-on-current-point

[Alexander]

clear all;clc;
x = (0:0.2:10); 
y = log(x);
DELAY = 0.001;
for i = 1:numel(x)
  p=plot(x(i),y(i),'*');
  comet(x,y);
  pause(DELAY)
end

I came across the comet function, however the animation is sporadic