在 seaborn 上绘制 y 轴网格和 kdeplot 之间的交点

Question

I have created the following plot using seaborn kdeplot and customizing the gridlines.

sns.set_style('whitegrid')
cdf_accuracy = sns.kdeplot(eval_df['accuracy'], cumulative=True)
cdf_accuracy.yaxis.set_major_locator(ticker.MultipleLocator(0.25))
cdf_accuracy.xaxis.set_major_locator(ticker.MultipleLocator(10))

However, I would like to show the gridlines on the x-axis just on the points were the y-axis gridlines intersect the plot. There is a way to do this?

Thanks for your answers

Answer 1

As long as your characteristic is monotonic, which should be given with a cumulative dataset, you could simply use interpolation on the y-values:

import numpy as np

y_intrsct = [.25, .5, .75]
x_intrsct = np.interp(y_intrsct, y_data, x_data)

which results in

array([67.69792378, 83.24194722, 92.24041857])

plotted with the following code:

import matplotlib.pyplot as plt

fig, ax = plt.subplots()
ax.plot(x_data, y_data)
ax.set_yticks(np.linspace(0, 1, 5))
ax.grid(axis='y')
ax.vlines(x_intrsct, *ax.get_ylim())