Asked by FC93
on 7 Oct 2016

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 by Marc Jakobi
on 7 Oct 2016

Edited by MathWorks Support Team
on 28 Nov 2018

Accepted Answer

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
on 7 Oct 2016

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

Stephen
on 23 Jan 2019

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.

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Answer by Massimo Zanetti
on 7 Oct 2016

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)))

Answer by KSSV
on 7 Oct 2016

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])

Answer by madhan ravi
on 18 Oct 2018

syms y

fplot(subs(y,5))

Does the same

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