Bug with plotting bar charts where bars are barely visible

📊 Plotly Python
1

Hi,

I think I may have discovered a bug where bar charts are not plotted visibly. See the image below where the bars in plots C and D are barely visible. The number of records is in the realm of 20-50, so roughly the same order of magnitude. I don’t understand why they are so faint.

image
image1210×1214 47.9 KB

I parsed the code I used to generate this chart.

import polars as pl
import pandas as pd
from plotly.subplots import make_subplots
import plotly.graph_objects as go

df = pl.read_csv(
    "https://gist.githubusercontent.com/KeremAslan/c20094b65c4023e8b1d8d6b70fe90f45/raw/bcd44ed1c98ad7021c4b3951e3815d9b22a021a1/stackoverflow_plotly"
)

values = ["value_a", "value_b", "value_c", "value_d"]
groups = ["A", "B", "C", "D", ""]

fig = make_subplots(
    # rows=len(values),
    # cols=len(groups),
    rows=len(groups),
    cols=len(values),
    shared_xaxes=True,
    shared_yaxes=True,
)

for group_index, group in enumerate(groups):
    for ix, value in enumerate(values):
        p = df.filter(pl.col("group") == group)
        fig.add_trace(
            go.Bar(
                x=pd.to_datetime(df.select("date").to_series()),
                y=df.select(value).to_series(),
            ),
            row=group_index + 1,
            col=ix + 1,
        )

fig.update_layout(showlegend=False)
fig.show()
2

Please do not publish here the links I have temporarily shared with SO. Because it will be disabled once you confirm it with your SO.

3

Ah sorry, I removed it.