Bug summary

ax.hist ignoreslw argument. Must uselinewidth in order to change the thickness of the lines.

Code for reproduction

# Test of lw vs linewidth in histogramshistogram1= [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

Expected outcome

Usinglw andlinewidth 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