Bug summary

My aim is to plot a colormap with e.g. 5 discrete colors (with 5 ticks centered per color).

Undermatplotlib 3.4.3, I got this working with the code snippet below usingNoNorm; under 3.5.0, only one color is plotted.

Is this a bug - or is my setup incorrect/unidiomatic and worked only by chance before?

Code for reproduction

importmatplotlib.pyplotaspltfrommatplotlibimportcm,colorsdata= [1,2,3,4,5]fig,ax=plt.subplots(figsize=(6,1))fig.subplots_adjust(bottom=0.5)norm=colors.NoNorm(vmin=min(data),vmax=max(data))cmap=cm.get_cmap("viridis",len(data))cbar=fig.colorbar(cm.ScalarMappable(norm=norm,cmap=cmap),cax=ax,orientation="horizontal")print(cbar.get_ticks())

Actual outcome

Thisis the output undermatplotlib 3.5.0.

Expected outcome

Thiswas the output undermatplotlib 3.4.3.

Additional information

No response

Operating system

Ubuntu

Matplotlib Version

3.5.0

Matplotlib Backend

module://matplotlib_inline.backend_inline

Python version

Python 3.9.7

Jupyter version

3.2.4

Installation

conda