# Adding vertical line to graph at certain height

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RP el 26 de Ag. de 2019
Comentada: John Navarro el 29 de Mzo. de 2020
Hi everyone,
I attached a picture of what I want to achieve - I'm using a script with a loop that creates a plot for each participant in a study and would like to add a vertical line at 4.5 seconds. I did manage to add a vertical line using
x=[4.5,4.5];
y=[-10,0];
plot(x,y)
However the problem is that I need to specify y-values. This is a problem because the y scale can differ vastly between participants (for some it will be 600 - 700, for some 0 - 10). Is there a universal way to add a line that simply starts at the bottom (at the x-axis) and goes up to a certain y-value? Thank you in advance!
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John Navarro el 29 de Mzo. de 2020

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### Respuesta aceptada

Steven Lord el 26 de Ag. de 2019
I'd use the stem function. First, generate some sample data and plot it. Turn hold on so we can add the stem plot later.
x = 1:10;
y = x.^2;
plot(x, y, '-');
hold on
For the selected stem locations, determine the corresponding y values.
xx = 2:1.75:9;
yy = interp1(x, y, xx);
Plot the stems.
s = stem(xx, yy);
You can adjust various properties of the stems using s. For instance, to make the markers larger magenta squares:
s.Marker = 's';
s.MarkerSize = 12;
s.MarkerFaceColor = 'm';
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Steven Lord el 26 de Ag. de 2019
See the BaseValue property of s.
RP el 26 de Ag. de 2019
That did it, thank you!

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