Matplotlib plot does not show lines when adding in annotations

Question

I am trying to figure out how matplotlib annotaitons work and I tried the following:

fig = plt.figure()
ax = fig.add_subplot(111, autoscale_on=False, ylim=(1, 9000000))

plt.plot(df['month'], df['France'], label='France')
plt.plot(df['month'], df['Germany'], label='Germany')

ax.annotate('test', xy=(100, 1000), xytext=(3, 1.5),
            arrowprops=dict(facecolor='black', shrink=0.05),
            )

fig.set_size_inches(15, 7)
plt.legend(loc=2)
plt.show()

It is giving me a plot area, but is not showing the lines or the annotations. Any thoughts?

The following works and gives me a graph, but no annotations, obviously:

fig = plt.figure()
ax = fig.add_subplot(autoscale_on=False, ylim=(1, 9000000))

plt.plot(df['month'], df['France'], label='France')
plt.plot(df['month'], df['Germany'], label='Germany')

fig.set_size_inches(15, 7)
plt.legend(loc=2)
plt.show()

xnx · Accepted Answer · 2015-08-14 18:45:11Z

1

Have you tried adding arrowstyle’='-' (or '->', or '<-' or '<->' depending on what type of line or arrow you want) to your arrowprops dictionary? Note also that the xy coordinates should be in data units, so it may be that (100, 1000) is not within your axes area (I don't know the range of values of your data.)

edited Aug 14, 2015 at 18:45

answered Aug 14, 2015 at 18:41

xnx

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4 Comments

metersk Over a year ago

My x axis is date time objects and my y axis goes up to 9M

xnx Over a year ago

How did you choose 100 and 3 as your x-coordinates for the arrow head and text location?

metersk Over a year ago

It was arbitrary, i was just trying to get the text to appear

xnx Over a year ago

To check if this is the problem, you could specify both pairs of coordinates in fractional axis coordinates (0-1) for each x and y, and set xycoords='axes fraction' and textcoords='axes fraction' as arguments to annotate

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