How can I add markers on a bar graph in python?

Question

I have made a horizontal bar graph, now I need to add markers on the bars. How can I do so?

The code I have so far is shown below:

def plot_comparison(): 
lengths = [11380, 44547, 166616, 184373, 193068, 258004, 369582, 462795, 503099, 581158, 660724, 671812, 918449]

y_pos = np.arange(len(length))
error = np.random.rand(len(length))

plt.barh(y_pos, length, xerr=error, align='center', alpha=0.4)
plt.yticks(y_pos, length)
plt.xlabel('Lengths')
plt.title('Comparison of different cuts')
plt.show()

Possible duplicate of [matplotlib: Set markers for individual points on a line](http://stackoverflow.com/questions/8409095/matplotlib-set-markers-for-individual-points-on-a-line) — Mike JS Choi, Dec 14 '16 at 05:43
Is there any way I can represent certain points on the graph? If not in the form of markers. — Sanchit795, Dec 14 '16 at 05:49

score 4 · Answer 1 · answered Dec 14 '16 at 08:34

You can simply add a plot command, plotting the y_pos against the lengths. Make sure to specify a maker and set linestyle to "" (or "none") otherwise the markers will be connected by straight lines.
The following code may be what you're after.

import matplotlib.pyplot as plt
import numpy as np

lengths = [11380, 44547, 166616, 184373, 193068, 258004, 369582, 462795, 503099, 581158, 660724, 671812, 918449]

y_pos = np.arange(len(lengths))
error = np.array(lengths)*0.08

plt.barh(y_pos, lengths, xerr=error, align='center', alpha=0.4)
plt.plot(lengths, y_pos, marker="D", linestyle="", alpha=0.8, color="r")
plt.yticks(y_pos, lengths)
plt.xlabel('Lengths')
plt.title('Comparison of different cuts')
plt.show()

How can I add markers on a bar graph in python?

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