I have a plot that looks like this:
I plot those arrows using the annotate method
ax.annotate('sample events', (x_value, y_value), xytext=(x_value, -3000), rotation=90, va='top', arrowprops = {'width': 2, 'headwidth': 4, 'linestyle': '--'})
but what I want is something like:
and it's better if the annotation text is on the x-axis, is there any way to do it?
(I've tried ax.axvline(x=x_value) but it makes vertical lines across the whole plot)
The easy method is to use ax.stem, for example:
import matplotlib.pyplot as plt
import numpy as np
y = np.random.random(20)
fig, ax = plt.subplots()
ax.plot(y)
ax.stem(y, markerfmt='.')
plt.show()
Resulting example plot is:
If You want to hide horizontal line, then use basefmt = " ":
ax.stem(y, basefmt = " ", markerfmt='.')
At first: You should avoid # within your code, since it will then be interpreted as a comment.
According to the documentation of ax.annotate, you should easily specify the line type as dashed, as well as the label placement. A good list of examples can be found here.
You should try something similar to: ax.annotate('dashed line', xy=(0.25,0.2), xytext=(0.6,0.2),arrowprops={'arrowstyle': '-', 'ls': 'dashed'}, va='center', rotate=90)
