Set different axis scales in the radar chart

[jingyao16]

hi,

thanks for your wonderful contribution.

Q: Can I use different axes in the radar chart?

[moshi4]

Hi @jingyao16,

The question is too brief and I am not sure if I understand exactly what is being asked.
Do you want a plot like the example below?

Code Example

from pycirclize import Circos
import pandas as pd
import matplotlib.pyplot as plt

# Create RPG jobs parameter dataframe (4 jobs, 8 parameters)
df = pd.DataFrame(
    data=[
        [80, 80, 80, 80, 80, 80, 80, 80],
        [90, 20, 95, 95, 30, 30, 80, 70],
        [60, 90, 20, 20, 100, 90, 50, 70],
        [70, 50, 60, 40, 60, 40, 100, 60],
    ],
    index=["Hero", "Warrior", "Wizard", "Assassin"],
    columns=["HP", "MP", "ATK", "DEF", "SP.ATK", "SP.DEF", "SPD", "LUK"],
)
print(df)

# Create 2 x 2 subplots
fig = plt.figure(figsize=(16, 16), dpi=100)
fig.subplots(2, 2, subplot_kw=dict(polar=True))
fig.subplots_adjust(wspace=0.15, hspace=0.15)

# Plot radar chart into subplots for each target
for target_name, ax in zip(df.index, fig.axes):
    target_df = df.loc[[target_name]]

    # Initialize Circos instance for radar chart plot
    circos = Circos.radar_chart(
        target_df,
        vmax=100,
        marker_size=6,
        cmap=dict(Hero="salmon", Warrior="skyblue", Wizard="lime", Assassin="magenta"),
        grid_interval_ratio=0.2,
        line_kws_handler=lambda _: dict(lw=2, ls="solid"),
        marker_kws_handler=lambda _: dict(marker="D", ec="grey", lw=0.5),
    )

    # Plot figure & set legend on upper right
    circos.plotfig(ax=ax)
    circos.ax.legend(loc="upper right", fontsize=10)

fig.savefig("example.png")

example.png

FYI: https://moshi4.github.io/pyCirclize/plot_tips/#subplots

[jingyao16]

Thanks for your prompt reply.

However, I supply my question, how to set axes with different scales in one plot?

For example, I want some axes to be linear but with different intervals like [0,20,40] and [1,5,7], and some axes to be logarithmic ones like [1, 10, 100].

[moshi4]

how to set axes with different scales in one plot?

There is no function in pyCirclize to set different axis scales to radar charts.
I think that setting different axis scales for radar charts should be avoided, so I have no plans to implement that functionality.

[moshi4]

Maybe my previous answer was an incorrect understanding of the question. I interpreted your question as 2. and gave an answer, but would 1. be the correct interpretation?

1. Change the scale for the entire axis in the radar chart
2. Change multiple scales for each axis in the radar chart

The vmax and grid_interval_ratio arguments of the Circos.radar_chart() method can be used to change the scale for the entire axis. I plan to allow the vmin argument to be set as well in the next release. It may be a bit difficult to implement to support logarithms.

e.g. vmax=200, grid_interval_ratio=0.25 => interval=[0, 50, 100, 150, 200]

[jingyao16]

Thanks for your reply.

Yes, my question is actually to change the scale for multiple axes in one radar chart. Get it. No worry, I can handle it by manually post-precessing.