Problem overlaying line on histogram

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Rebecca Ward 2019-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/479866-problem-overlaying-line-on-histogram

评论： Rebecca Ward 2019-9-11

Hi,

I'm having a problem plotting a vertical line on a histogram plot. The histogram appears fine but the line does not show up. I've tried both the mothod given in

https://uk.mathworks.com/matlabcentral/answers/343757-how-to-plot-a-line-on-the-histogram

and using 'plot(ACH(:,1),ACH(:,2));' but in both instances the line isn't visible.

For the histogram I'm using 'histogram(priors1010(:,1), nbins, 'FaceColor','r'); hold on;'

I'm using MATLAB R2018a.

Can anyone advise as to how to make the vertical line visible?

Thanks

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Rik 2019-9-11

Try to make a MWE so we can run your code without any other dependencies and can reproduce your issue.

Rebecca Ward 2019-9-11

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Thanks for replying - here's a MWE

clear; close all;
pd = makedist('normal',0,0.5');
testdata=random(pd,1000);
figure('WindowStyle','docked');
histogram(testdata);
hold on;
line([1, 1], 2, 'LineWidth', 2, 'Color', 'k');

Cheers, Rebecca

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Answer 1

Bruno Luong 2019-9-11

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编辑：Bruno Luong 2019-9-11

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Your y-ccordinates "2" makes the line reduce to a single point. Try

line([1, 1], ylim(gca), 'LineWidth', 2, 'Color', 'k');

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Steven Lord 2019-9-11

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If upgrading to release R2018b or later is an option, there is a new function named xline that will do this and will still appear even if you change the Y limits of the axes.

%% Create a sample plot
plot(1:10)
xline(5);
% Note that the line extends from the bottom of the axes to the top
%% Change the Y limits
axis([1 10 5 15])
% The line still spans the entire axes
%% Enable panning up and down
pan yon
% If you pan up and down, no matter how far you go you can see the line