CODEWITHSUNDEEP
pythonmatplotlibgraph
Ian
Ian

Reputation: 1716

Horizontal bar chart that does not start at zero / displaying ranges

I am trying to visualize a set of frequency ranges for around 20 samples I have. What I want to do is a horizontal bar chart where each row represents one sample. The sample name is supposed to go on the left and on the right I want an x-axis with limits 0 and 150 kHz.

Now the ranges I have are something like (70.5, 95.5). Can I realize this with a horizontal bar chart or am I looking for a different type of chart?

Sorry that I can't provide an example, because I just got nothing so far. A bar chart just doesn't do what I want.

Edit: I basically want something like in this example but without the actual bars and with being able to enter my data for the error bars. As far as I know error bars can only work with errors relative to the "main data".

Upvotes: 1

Views: 3597

Answers (1)

xnx
xnx

Reputation: 25548

If I understand you correctly, you can do this with a simple errorbar plot (though it's a bit of a hack):

import numpy as np
import matplotlib.pyplot as plt

# 20 random samples
nsamples = 20
xmin, xmax = 0, 150
samples = np.random.random_sample((nsamples,2)) * (xmax-xmin) + xmin
samples.sort(axis=1)
means = np.mean(samples, axis=1)
# Find the length of the errorbar each side of the mean
half_range = samples[:,1] - means
# Plot without markers and customize the errorbar
_, caps, _ = plt.errorbar(means, np.arange(nsamples)+1, xerr=half_range, ls='',
                          elinewidth=3, capsize=5)
for cap in caps:
    cap.set_markeredgewidth(3)

# Set the y-range so we can see all the errorbars clearly
plt.ylim(0, nsamples+1)
plt.show()

enter image description here

Upvotes: 3

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