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!

[Sabrina Vasiliadis]

Can you add characteristics to this line somehow? I want it to be a black solid line.

[Steven Lord]

plot(1:10)
h = yline(5, 'r--', 'LineWidth', 4);

You can change various properties of the line using its handle, or you can set those properties when the line is constructed like I did with the linespec ('r--') and the property names (LineWidth).

[JORGE ORDOÑEZ CARRASCO]

Hello i have a question about this topic what if a need severel ylines, spaced every 100 unitos and my axis goes from 0 to 2500, as you can see bellow, i have to add every 100 units a line and name it, is there a short cut cause i need to do this at least 23 times. Thank you

hold on 
yline(244.229,'--','Lat 37')
hold on 
yline(356.5,'--','Lat 38')
hold on 
yline(468.7,'--','Lat 39')
hold on 
yline(580.916,'--','Lat 40')
hold on 
yline(693.145,'--','Lat 41')
hold on 
yline(805.373,'--','Lat 42')
hold on 
yline(917.602,'--','Lat 43')

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.