Adding vertical line to plot?

조회 수: 3,162 (최근 30일)
Philip
Philip 2011년 2월 25일
댓글: Walter Roberson 2023년 2월 26일
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!
  댓글 수: 3
Benita
Benita 2023년 2월 26일
(4x3+y3 )dx+(3xy²-8y3)dy=0

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채택된 답변

Michelle Hirsch
Michelle Hirsch 2023년 8월 28일
편집: MathWorks Support Team 2022년 4월 28일
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)])
  댓글 수: 8
Walter Roberson
Walter Roberson 2021년 2월 21일
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 2021년 8월 23일
Hello all! do you know if this magical (awesome) feature can be done in Z axis for bar3?

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추가 답변 (10개)

Muhammad
Muhammad 2014년 7월 8일
line([x x], [y1 y2]); is the easy command;
  댓글 수: 4
Claire Flashman
Claire Flashman 2018년 2월 11일
Thank you!
Christian Sanchez
Christian Sanchez 2020년 5월 8일
Genial

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carolina franco
carolina franco 2017년 10월 26일
편집: MathWorks Support Team 2018년 11월 8일
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:
  댓글 수: 4
Edward Manson
Edward Manson 2019년 8월 28일
편집: Edward Manson 2019년 8월 28일
What an absolute god, thankyou
Rasmus Ringsborg Nielsen
Rasmus Ringsborg Nielsen 2021년 3월 11일
Thank you so much, works perfect!!

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Mark
Mark 2013년 3월 12일
편집: Mark 2013년 3월 12일
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 2018년 11월 1일
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 2011년 2월 25일
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 2014년 3월 28일
편집: James 2014년 3월 28일
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');
  댓글 수: 5
Walter Roberson
Walter Roberson 2020년 2월 8일
이동: DGM 2023년 2월 25일
-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 2020년 2월 8일
이동: DGM 2023년 2월 25일
Now it makes sense to me! Thank you a lot!

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Pedro Luis Camuñas García-Miguel
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.
  댓글 수: 2
Walter Roberson
Walter Roberson 2018년 4월 23일
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
Thanks!

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Julian Williams
Julian Williams 2019년 2월 9일
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 2022년 11월 22일
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
  댓글 수: 2
Walter Roberson
Walter Roberson 2022년 11월 22일
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 2022년 11월 22일
Agree, but xline accepts a vector only in the latest versions

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Jos (10584)
Jos (10584) 2014년 7월 8일
You might also be interested in GRIDXY on the File Exchange:

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