Matlab animation for x y plot that varies with time.

Hello, I have a simple function that varies with time. The function is y=mx however, m varies with time. at 10 sec it is 3 and at 20 sec it is 5. I want to have animation xy plot that shows how xy plot varies with time. How can I put a clock at the top of the graph that shows the time? This is the code I tried.

    clear all
  clc

x = 0:10:(100);
%at 10 sed
y=3*x;
%at 20 sed
y=5*x;
%at 50 sed
y=7*x;

slope=[3 5 7]

for k=1:3
    y(k,:)=slope(k)*x;
end

for i=1:3

      hold all
      plot(x,y(i,:))

     pause(0.5)

%    
end

Any help is appreciated.

Thanks

Answer 1

[Walter Roberson]

slope_times = [0, 10, 20, 50];
slope       = [1,  3,  5,  7];  %you need to recheck the initial slope
x = 0:10:100;

times = linspace(slope_times(1), slope_times(end));

m = interp1(slope_times, slope, times);

for k = 1 : length(times)
  y = m(k) * x;
  plot(x, y);
  title( sprintf('t = %.1f', times(k)) );
  hold all
  pause( 0.5 );
end

hold off