Plotting a straight line y=c

I've searched forums but surprisingly can't find anything that seems to work how I would like.

The following is my code:

if true
 % m=50; %kg
 k=100; %kN/m
 M=200; %kg
 g=9.81; %ms-1
 t = 0:0.01:10; %s

   F0 = M*g;
   omega0 = sqrt(k/m);
   x = (F0/k)*(1-cos(omega0*t));

   c1 = (M*g)/k;

   plot(t,x);
   hold on;
   plot(t, c1);

end

All I wish to do is plot x(t) then plot y=c1 on top. The first seems to plot but the second doesn't appear.

I'm relatively new to MatLab so any advise would help!

Thanks in advance.

Answer 1

[Star Strider]

The easiest way to plot a horizontal line at ‘c1’ is simply:

plot(xlim, c1*[1 1]);

The xlim call returns the current value of the x-axis limits as a (1x2) vector. All you then need to do is to supply a (1x2) vector at the value of ‘c1’, and it will plot the line.

[Tom Fry]

Awesome, thank you!!

[Star Strider]

As always, my pleasure!