How to plot vertical lines?

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andrea
andrea 2014-10-20
评论： Alberto Sivera 2021-11-17
This is the script:
x=[0:0.1:10]; x1=5;
plot(x,2*sin(x),x,5*sin(x),x,cos(x));
line([x1 x1],???????);
I would like to plot the vertical line from the top to the bottom without knowing the y-axis limits.
Thanks in advance!

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2014-10-20
x=[0:0.1:10];
x1=5;
plot(x,2*sin(x),x,5*sin(x),x,cos(x));
y1=get(gca,'ylim')
hold on
plot([x1 x1],y1)

更多回答（5 个）

Kelly Kearney
Kelly Kearney 2014-10-20
line([x1 x1], get(gca, 'ylim'));
Or this function will automate the process, if you have a lot of reference lines to plot.
  5 个评论
显示 3更早的评论
Image Analyst
Image Analyst 2021-11-17
@Alberto Sivera if you have R2018b or later, you should really be using xline() like @Pierre Tallotte shows in his answer below.
xline(x1, 'Color', 'r', 'LineWidth', 2);
Alberto Sivera
Alberto Sivera 2021-11-17
thank you, but unfortunately I have the r2017b version and i'm too lazy to update it :)

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Pierre Tallotte
Pierre Tallotte 2020-4-10
The xline function is just what you need:
x=[0:0.1:10]; x1=5;
plot(x,2*sin(x),x,5*sin(x),x,cos(x));
xline(x1);
Image Analyst
Image Analyst 2014-10-20
simply pass in ylim for the y array:
line([x1 x1], ylim);
  3 个评论
显示 1更早的评论
Image Analyst
Image Analyst 2017-7-27
Not sure.
ylim() is not returning the correct y axis range limits.
That certainly is weird. I'd call tech support on this one.
Jan
Jan 2017-8-28
@Liyuan: See my answer.

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Jan
Jan 2017-8-28
If the axes is scaled, e.g. when adding new objects or for printing, using the current limits for the Y-position is fragile. You can use much larger positions and exclude the line from the list of objects, which influence the auto-scaling:
YL = get(gca, 'ylim');
YR = YL(2) - YL(1);
YL = [YL(1) - 1000 * YR, YL(2) + 1000 * YR];
line([5, 5], YL, 'YLimInclude', 'off')
'YLimInclude' in undocumented and might be removed in the future.
Jefferson Martinez Saavedra
Does someone know how to get/download xline and yline functions? I have R2018a's version of MATLAB.
Thank you in advance.
  1 个评论
Image Analyst
Image Analyst 2020-10-23
If you dont' have xline and yline you can use line():
xl = xlim;
yl = ylim;
line([x, x], yl); % Old way of doing xline().
line(xl, [y, y]); % Old way of doing yline().

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