dc.pl.dotplot: vcenter=0 does not center white color at zero when using RdBu_r colormap #293
Description
Report
When calling dc.pl.dotplot() with vcenter=0 and cmap='RdBu_r', the white color in the colormap is not centered at 0.
To reproduce
import decoupler as dc
import pandas as pd
top_pathways = pd.read_csv('top_pathways.csv')
dc.pl.dotplot(
df=top_pathways,
x="score",
y="variable",
s="logpval",
c="score",
top=len(top_pathways),
scale=0.6,
figsize=(3, 4.8),
vcenter=0,
cmap='RdBu_r'
)
Example output: 0 and some of the negative values were given red color.
Versions
| Package | Version |
| --------- | ------- |
| decoupler | 2.1.4 |
| Dependency | Version |
| ------------------ | ---------------------- |
| texttable | 1.7.0 |
| stack_data | 0.6.3 |
| urllib3 | 2.6.3 |
| seaborn | 0.13.2 |
| ipython | 9.11.0 |
| pillow | 12.1.1 |
| session-info2 | 0.4 |
| certifi | 2026.2.25 (2026.02.25) |
| threadpoolctl | 3.6.0 |
| platformdirs | 4.9.4 |
| six | 1.17.0 |
| h5py | 3.15.1 |
| google-crc32c | 1.8.0 |
| cycler | 0.12.1 |
| executing | 2.2.1 |
| donfig | 0.8.1.post1 |
| scikit-learn | 1.8.0 |
| marsilea | 0.5.8 |
| prompt_toolkit | 3.0.52 |
| PyYAML | 6.0.3 |
| zarr | 3.1.5 |
| pyparsing | 3.3.2 |
| requests | 2.32.5 |
| xgboost | 3.2.0 |
| array-api-compat | 1.14.0 |
| asttokens | 3.0.1 |
| scanpy | 1.12 |
| natsort | 8.4.0 |
| adjustText | 1.3.0 |
| comm | 0.2.3 |
| msgpack | 1.1.2 |
| numcodecs | 0.16.5 |
| legendkit | 0.3.4 |
| charset-normalizer | 3.4.5 |
| PySocks | 1.7.1 |
| patsy | 1.0.2 |
| dcor | 0.7 |
| python-dateutil | 2.9.0.post0 |
| tqdm | 4.67.3 |
| legacy-api-wrap | 1.5 |
| docrep | 0.3.2 |
| fast-array-utils | 1.3.1 |
| pandas | 3.0.1 |
| kiwisolver | 1.5.0 |
| Brotli | 1.2.0 |
| jedi | 0.19.2 |
| packaging | 26.0 |
| idna | 3.11 |
| decorator | 5.2.1 |
| scipy | 1.17.1 |
| traitlets | 5.14.3 |
| anndata | 0.12.6 |
| pure_eval | 0.2.3 |
| Pygments | 2.19.2 |
| statsmodels | 0.14.6 |
| llvmlite | 0.46.0 |
| typing_extensions | 4.15.0 |
| parso | 0.8.6 |
| igraph | 1.0.0 |
| numpy | 2.4.2 |
| matplotlib | 3.10.8 |
| numba | 0.64.0 |
| setuptools | 82.0.1 |
| joblib | 1.5.3 |
| ipywidgets | 8.1.8 |
| wcwidth | 0.6.0 |
| Component | Info |
| --------- | -------------------------------------------------------------------------------- |
| Python | 3.14.3 | packaged by conda-forge | (main, Feb 9 2026, 22:09:14) [Clang 20.1.8 ] |
| OS | macOS-26.3-arm64-arm-64bit-Mach-O |
| Updated | 2026-03-12 21:10