Add various horizontal lines to a plot

Question

FC93 ，2016-10-7

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https://ww2.mathworks.cn/matlabcentral/answers/306204-add-various-horizontal-lines-to-a-plot

评论： JORGE ORDOÑEZ CARRASCO ，2021-11-23

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.

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Answer 1

Marc Jakobi 2016-10-7

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https://ww2.mathworks.cn/matlabcentral/answers/306204-add-various-horizontal-lines-to-a-plot#answer_237927

编辑：MathWorks Support Team 2018-11-28

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

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JORGE ORDOÑEZ CARRASCO 2021-11-23

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')

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Answer 2

Massimo Zanetti 2016-10-7

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https://ww2.mathworks.cn/matlabcentral/answers/306204-add-various-horizontal-lines-to-a-plot#answer_237929

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)))

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Rolando Murilli 2020-8-16

Thanks!!

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Answer 3

KSSV 2016-10-7

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https://ww2.mathworks.cn/matlabcentral/answers/306204-add-various-horizontal-lines-to-a-plot#answer_237930

   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])