How to plot a vertical line in a semilog diagram?

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nilsotto
nilsotto 2016-2-20
编辑： Hazem Elgbara 2018-5-15
Hi, Actually, I want to draw a red rectangle by letting the horizontal red line stop at 1000 counts, and then a vertical line down to the x-axis. Look at the supplemented file 'kalle.png'. Is this possible using semilogx or other similar function?
  1 个评论
dpb
dpb 2016-2-20
编辑：dpb 2016-2-20
No file attached...but--
What's the problem in just drawing lines where wanted? The input to the semilog$ or loglog routines are in the underlying units so there's no issue of what values to use. You can always query the axis limits to determine what they are in the plot if that's the uncertainty. Use hold on before adding more to the plot, of course, to retain the existing plot.

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Hazem Elgbara
Hazem Elgbara 2018-5-15
编辑：Hazem Elgbara 2018-5-15
I had the same problem and found my solution here: semilogy([34,34],[0,22222]) does not show vertical line
This is my code:
semilogy(data(:,2))
hold on
semilogy(data(:,3))
cut = 50; ycut = [1e-10 max(max(data(:,2:3)))];
semilogy([cut cut],ycut)

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