Adding vertical line to plot?

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Philip
Philip el 25 de Feb. de 2011
Comentada: Walter Roberson el 26 de Feb. de 2023
Hi there, Can anyone please tell me how I can add a vertical line to my plot at a specified sample point? For example, I have a a 1x41 vector of intensity values, and I would like to add a vertical line on the center sample (sample number 21). Many thanks!
  3 comentarios
Benita
Benita el 26 de Feb. de 2023
(4x3+y3 )dx+(3xy²-8y3)dy=0

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Respuesta aceptada

Michelle Hirsch
Michelle Hirsch el 28 de Ag. de 2023
Editada: MathWorks Support Team el 28 de Abr. de 2022
Woohoo - this is built into MATLAB now, as of R2018b! 
If you are running R2018b or later, you can use the “xline” and “yline” functions. For example, create a vertical line at x=5:
xline(5)
Create a horizontal line at y=10:
yline(10)
Starting in R2021a, you can create multiple horizontal or vertical lines in one pass. For example, create vertical lines at x=1, x=2, and x=3:
xline([1 2 3])
If you are running R2018a or earlier, use the “plot” function with this pattern:
Horizontal line:
plot([x1 x2],[y y])
Vertical line:
plot([x x],[y1 y2])
For example, plot a vertical line at x = 21. Set the y values using the y-axis limits of the axes.
y = ylim; % current y-axis limits
plot([21 21],[y(1) y(2)])
  8 comentarios
Walter Roberson
Walter Roberson el 21 de Feb. de 2021
in https://www.mathworks.com/matlabcentral/answers/2031-adding-vertical-line-to-plot#answer_207851 Michelle posted a link to a file exchange contribution that defines vline.
Roberto Chang
Roberto Chang el 23 de Ag. de 2021
Hello all! do you know if this magical (awesome) feature can be done in Z axis for bar3?

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Más respuestas (10)

Muhammad
Muhammad el 8 de Jul. de 2014
line([x x], [y1 y2]); is the easy command;
  4 comentarios
Claire Flashman
Claire Flashman el 11 de Feb. de 2018
Thank you!
Christian Sanchez
Christian Sanchez el 8 de Mayo de 2020
Genial

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carolina franco
carolina franco el 26 de Oct. de 2017
Editada: MathWorks Support Team el 8 de Nov. de 2018
You can plot a horizontal or vertical line using the “plot” function with this pattern:
- Horizontal line:
plot([x1 x2],[y y])
- Vertical line:
plot([x x],[y1 y2])
For example, plot a vertical line at x = 21. Set the y values using the y-axis limits of the axes.
y = ylim; % current y-axis limits
plot([21 21],[y(1) y(2)])
As Steven suggested, starting in R2018b, you can use the “xline” and “yline” functions instead. For more information, see:
  4 comentarios
Edward Manson
Edward Manson el 28 de Ag. de 2019
Editada: Edward Manson el 28 de Ag. de 2019
What an absolute god, thankyou
Rasmus Ringsborg Nielsen
Rasmus Ringsborg Nielsen el 11 de Mzo. de 2021
Thank you so much, works perfect!!

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Mark
Mark el 12 de Mzo. de 2013
Editada: Mark el 12 de Mzo. de 2013
Probably the simplest way:
Choose the x-value where you want the line "xval." Choose the minimum y value to be displayed on your graph "ymin" and the maximum y value to be displayed on your graph "ymax."
x=[xval,xval];
y=[ymin,ymax];
plot(x,y)
Flaws with this method: probably will look silly if you use '-x' or '-.', these mark your specific points on the line, but you'll only have two (at least they're endpoints).

Steven Lord
Steven Lord el 1 de Nov. de 2018
If you're using release R2018b or later, use the xline or yline functions to create lines with constant x or y values respectively.

the cyclist
the cyclist el 25 de Feb. de 2011
One way:
figure
x = rand(1,41);
y = 1:41;
plot(x,y,'r.');
line([x(21) x(21)],[0 41]);
set(gca,'YLim',[0 41])

James
James el 28 de Mzo. de 2014
Editada: James el 28 de Mzo. de 2014
There is an excellent answer over on http://stackoverflow.com/a/8108766/1194420 repeated below for convenience. ---
There exist an undocumented function graph2d.constantline:
plot(-2:5, (-2:5).^2-1)
%# vertical line
hx = graph2d.constantline(0, 'LineStyle',':', 'Color',[.7 .7 .7]);
changedependvar(hx,'x');
%# horizontal line
hy = graph2d.constantline(0, 'Color',[.7 .7 .7]);
changedependvar(hy,'y');
  5 comentarios
Walter Roberson
Walter Roberson el 8 de Feb. de 2020
Movida: DGM el 25 de Feb. de 2023
-2:5 is the list of values -2 -1 0 1 2 3 4 5 . The .^2 squares each element of the list giving you 4 1 0 1 4 9 16 25 . Then you subtract 1 from each giving you 3 0 -1 0 3 8 15 24
Adrian Peters
Adrian Peters el 8 de Feb. de 2020
Movida: DGM el 25 de Feb. de 2023
Now it makes sense to me! Thank you a lot!

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Pedro Luis Camuñas García-Miguel
Pedro Luis Camuñas García-Miguel el 13 de Abr. de 2018
Maybe it is a bit late but I want to contribute, there is a really easy way to add vertical and horizontal lines, you just have to use a hold and then overlap them over the main plot.
Before declaring the original plot, add a hold on to ensure it will retain both plots, then plot the lines, with this structure:
hold on;
plot(the main function)
plot([x x],[0 y_max]) % Vertical Line
plot([o x_max],[y y]) % Horizontal line
Being:
x: location on horizontal axis where you place the vertical line.
y: location on vertical axis where you place the horizontal line.
x_max: point where you want the vertical line to end.
y_max: point where you want the horizontal line to end.
I hope this was useful to whoever consults this page.
  2 comentarios
Walter Roberson
Walter Roberson el 23 de Abr. de 2018
If you use line() instead of plot() then you do not need the "hold". line() is one of the primitives that always adds to the current plot; it is the "high level plotting routines" that clear the current axes before plotting and need the "hold"
Pedro Luis Camuñas García-Miguel
Pedro Luis Camuñas García-Miguel el 8 de Mayo de 2018
Thanks!

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Julian Williams
Julian Williams el 9 de Feb. de 2019
Small additional suggestion, say you want to label your line in the legend so that it has some meaning, or take advantage of some of the easy to use options in plot, then using "hold", the ylim from the current axis and the "repmat" is very useful. You can also make multiple vertical lines with some spacing using this technique.
figure
% make some sort of illustration
T = 1000;
A = 0.7;
h = [];
Y = cumsum(sqrt(0.05).*randn(T,1));
X = (1:T)./T;
I = find(X>A);
Y(I) = Y(I(1));
h(1) = plot(X,Y,'-k','linewidth',2);
hold on
dims = get(gca,'ylim');
yy = linspace(dims(1),dims(2),100);
xx = repmat(A,1,100);
h(2) = plot(xx,yy,':r','linewidth',2);
dims = get(gca,'xlim');
xx = linspace(dims(1),dims(2).*A,100);
yy = repmat(Y(I(1)),1,100);
h(3) = plot(xx,yy,':b','linewidth',2);
grid on
G = legend(h,'Particle Motion','Stopping Point','Stopped Value');
set(G,'location','best','interpreter','latex');
Just a thought.

Guy Cohen
Guy Cohen el 22 de Nov. de 2022
You can use arrayfun
x=1:180;
figure;plot(x,sind(x)); %-- your graph
vLines=[20 40 50 120];%-- vector of lines to plot
hold on; arrayfun(@xline,vLines);%-- plot vertical lines
  2 comentarios
Walter Roberson
Walter Roberson el 22 de Nov. de 2022
You could, but xline accepts a vector of values, so you can just
x=1:180;
plot(x,sind(x)); %-- your graph
xline([20 40 50 120])
Guy Cohen
Guy Cohen el 22 de Nov. de 2022
Agree, but xline accepts a vector only in the latest versions

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Jos (10584)
Jos (10584) el 8 de Jul. de 2014
You might also be interested in GRIDXY on the File Exchange:

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