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[Bug]: Histogram ignores lw argument, no warning or error #29977

Closed as duplicate

Description

@gullbrekken

Bug summary

ax.hist ignores lw argument. Must use linewidth in order to change the thickness of the lines.

Code for reproduction

# Test of lw vs linewidth in histograms

histogram1 = [1]
histogram2 = [3]
histogram3 = [5]

fig, ax = plt.subplots(figsize=(8, 8))
ax.hist(histogram1, bins=1, density=True, histtype='step', color='tab:blue', lw=1, label='lw=1')
ax.hist(histogram2, bins=1, density=True, histtype='step', color='tab:orange', lw=3, label='lw=3')
ax.hist(histogram3, bins=1, density=True, histtype='step', color='tab:green', linewidth=3, label='linewidth=3')
ax.legend()

plt.show()

print(matplotlib.__version__)

Actual outcome

Image

Expected outcome

Using lw and linewidth produce same output.

Additional information

This was not a problem with an earlier version of Matplotlib (don't remember the version unfortunately, but definitely 3.x something).

Operating system

Ubuntu 24.04.2 LTS

Matplotlib Version

3.10.0

Matplotlib Backend

agg

Python version

3.12.3

Jupyter version

4.2.5

Installation

pip

Activity

  1. rcomer commented on Apr 28, 2025

    @rcomer
    Member

    Thanks @gullbrekken for the report. This has already been fixed ready for the next release by #29552.

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