python - Mean line on top of bar plot with pandas and matplotlib -
i'm trying plot pandas dataframe, , add line show mean , median. can see below, i'm adding red line mean, doesn't show.
if try draw green line @ 5, shows @ x=190. apparently x values treated 0, 1, 2, ... rather 160, 165, 170, ...
how can draw lines x values match of x axis?
from jupyter:
full code:
%matplotlib inline pandas import series import matplotlib.pyplot plt heights = series( [165, 170, 195, 190, 170, 170, 185, 160, 170, 165, 185, 195, 185, 195, 200, 195, 185, 180, 185, 195], name='heights' ) freq = heights.value_counts().sort_index() freq_frame = freq.to_frame() mean = heights.mean() median = heights.median() freq_frame.plot.bar(legend=false) plt.xlabel('height (cm)') plt.ylabel('count') plt.axvline(mean, color='r', linestyle='--') plt.axvline(5, color='g', linestyle='--') plt.show()
use plt.bar(freq_frame.index,freq_frame['heights']) plot bar plot. bars @ freq_frame.index positions. pandas in-build bar function not allow specifying positions of bars, far can tell.
%matplotlib inline pandas import series import matplotlib.pyplot plt heights = series( [165, 170, 195, 190, 170, 170, 185, 160, 170, 165, 185, 195, 185, 195, 200, 195, 185, 180, 185, 195], name='heights' ) freq = heights.value_counts().sort_index() freq_frame = freq.to_frame() mean = heights.mean() median = heights.median() plt.bar(freq_frame.index,freq_frame['heights'], width=3,align='center') plt.xlabel('height (cm)') plt.ylabel('count') plt.axvline(mean, color='r', linestyle='--') plt.axvline(median, color='g', linestyle='--') plt.show() 
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