converting bar graph to dot plot in matplotlib?

Question

Given the following horizontal bar graph:

import matplotlib.pyplot as plt
from numpy import *
from scipy import *
bars = arange(5) + 0.1
vals = rand(5)
print bars, vals
plt.figure(figsize=(5,5), dpi=100)
spines = ["bottom"]
ax = plt.subplot(1, 1, 1)
for loc, spine in ax.spines.iteritems():
  if loc not in spines:
    spine.set_color('none')
# don't draw ytick marks
#ax.yaxis.set_tick_params(size=0)
ax.xaxis.set_ticks_position('bottom')
plt.barh(bars, vals, align="center")
plt.savefig("test.png")

how can it be changed so that instead of bars, there are just dotted lines with a marker (e.g. 'o') on top? as in dot plots. thanks.

I believe that what you are looking for is more commonly known as a lollipop plot. For anyone looking to create a dot plot in matplotlib, you can find answers here and here. It is also worth noting that a vertical lollipop plot can be created using the matplotlib stem plot. — Patrick FitzGerald
– Patrick FitzGerald, Commented Feb 2, 2021 at 14:14

joaquin · Accepted Answer · 2012-01-29 20:37:03Z

6

Not sure about your question. You only need to change:

plt.barh(bars, vals, align="center")

with

plt.plot(vals, bars, 'o--')

Edited after OP clarification: If you want horizontal lines, use:

plt.plot(vals, bars, 'o')
plt.hlines(bars, [0], vals, linestyles='dotted', lw=2)

enter image description here

edited Jan 29, 2012 at 20:37

answered Jan 29, 2012 at 19:19

joaquin

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1 Comment

user248237 Over a year ago

thanks, but I'd like to be a bar not a curve, so the dotted line should extend horizontally from x = 0 to the value of the bar along x, it should not be plotted vertically

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