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Draw vertical line on histogram plot matlab

Matlab R2015b. I used the following code to draw the histogram:

close all;
hold on;
ko = histograms_windows_1_0{7};
histogram(ko);
set(gca,'XLim',[0 30],'XTick',0:5:30);
xticks = [0;0.16;0.33;0.5;0.66;0.83;1];
set(gca,'XTickLabel', xticks)
xlabel('Seconds');
ylabel('Correct Transitions');

That gives me the picture:

enter image description here

Now I want to add vertical line showing mean value by the "seconds" axis, I already know that value and also the standard deviation. Something similar to:enter image description here

I have mn and stdv values. I've tried this:

mn = mean(ko) / 30;
stdv = std(ko) / 30;
hax=axes;
line([mn mn],get(hax,'YLim'))
hold off;

But it ignores previously drawn histogram and draws vertical line but only that line is shown, no histogram anymore. How that can be achieved?

Solution

  • The problem is the line

    hax=axes;

    This creates a new axis object which covers the previous one.

    The solution is to change into

    hax=gca;

    so that the subsequent line goes to the same axis that contains the histogram.