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Matplotlib vline label parameter not showing

I want to label my vertical lines with matplotlib's .vline command, but for some reason the label parameter doesn't do anything/show anything on the final plot. Does anyone know how to get the label to show?

plt.vlines(x=pah, ymin=0, ymax=0.6, colors='0.75', linestyles='dashed', label='PAHs')

Everything works apart from the label.

Many thanks,

L

like image 755
Lawrence Avatar asked Nov 26 '14 16:11

Lawrence


2 Answers

The label keyword is displayed in the legend. You need create the legend explicitly to see the label in the plot:

plt.vlines([1,2,3], 0, 1, label='test')
plt.legend()
like image 181
user2304916 Avatar answered Sep 19 '22 16:09

user2304916


For text near your line as in this example use:

vline_value = 3

fig, ax = plt.subplots(figsize=(10,10))
ax.axvline(x=vline_value, ymin=0, ymax=1) 
x_bounds = ax.get_xlim()
ax.annotate(s='vline_value', xy =(((vline_value-x_bounds[0])/(x_bounds[1]-x_bounds[0])),1.01), xycoords='axes fraction', verticalalignment='right', horizontalalignment='right bottom' , rotation = 270)
fig.savefig('example')

Also, this short script holds more options if you want: https://pythonhosted.org/lineid_plot/#

like image 28
Tomer Nussbaum Avatar answered Sep 18 '22 16:09

Tomer Nussbaum