Add various horizontal lines to a plot

How can I add various horizontal lines to a plot?

I have a plot and now I want to add several horizontal lines. I would like to draw a horizontal line between x=-6 to x=-2 and another horizontal line between ×=3 and x=10.

Could someone show me a way to do it? Thank you.

Answer 1

[Marc Jakobi]

If you want the line to have specific end points, you can use the line function. For example, this code draws a horizontal line at y = 5 between the points x = -6 and x = -2.

y = 5;
line([-6,-2],[y,y])

Starting in R2018b, you can use the xline and yline functions to draw vertical and horizontal lines, respectively. For example, this code draws a horizontal line at y = 5. The horizontal line extends in both the positive and negative directions with no end points.

yline(5)

For more information on the yline function, see: https://www.mathworks.com/help/matlab/ref/yline.html

[FC93]

Exactly, thank you. Now I included all the horizontal lines I needed.

[Stephen]

This helped me, too.

Is is also possible to draw a horizontal line of specified length BELOW a figure? I have a heatmap that plots certain data versus time on the x axis. I'd like to add a calibration bar just below the x axis.

[Steeven Lopez]

Thx a lot!

Answer 2

[Massimo Zanetti]

Horizontal line at what y coordinate? Fix y and then plot the line, for example if y=5:

x=1:12;
y=5;
plot(x,y*ones(size(x)))

[FC93]

Thank you for your help.

[Rolando Murilli]

Thanks!!

Answer 3

[KSSV]

   x=linspace(-6,-2,M) ; 
   %%y range
   N = 50 ;
   y = linspace(-5,5,N) ;  % you have to select y range 
   for i = 1:N
       xi = x ;
       yi = y(i)*ones(size(xi)) ;
       plot(xi,yi,'r')
       hold on
   end
   x=linspace(3,10,M) ; 
   %%y range
   N = 50 ;
   y = linspace(-5,5,N) ;
   for i = 1:N
       xi = x ;
       yi = y(i)*ones(size(xi)) ;
       plot(xi,yi,'r')
       hold on
   end
  xlim([-10 40])

[FC93]

Thank you for your help.