Connecting non-adjacent data points in Seaborn pointplot

问题

I want to plot categorical plots with the Seaborn pointplot, but data points that are not adjacent are not connected with a line in the plot. I would like to interpolate between non adjacent points, and connect them in the same way as adjacent points are connected, how can I do this?

An example: In the left and middle images, the blue and green points should be connected with a curve, respectively, but now they are separated into small parts. How can I plot the left and middle images just like the right one?

fig, axs = plt.subplots(ncols=3, figsize=(10,5))
exp_methods = ['fMRI left', 'fMRI right', 'MEG']
for i in range(3):
    experiment = exp_methods[i]
    dataf = df[df['data']==experiment]    
    sns.pointplot(x='number_of_subjects', y='accuracy', hue='training_size', data=dataf,
               capsize=0.2, size=6, aspect=0.75, ci=95, legend=False, ax=axs[i])

回答1:

I don't think there is an option to interpolate where there are missing data points, and hence the line stops instead. This question on the same topic from 2016 remains unanswered.

Instead, you could use plt.errorbar as suggested in the comments, or add the lines afterwards using plt.plot while still using seaborn to plot the means and error bars:

import seaborn as sns

tips = sns.load_dataset('tips')

# Create a gap in the data and plot it
tips.loc[(tips['size'] == 4) & (tips['sex'] == 'Male'), 'size'] = 5
sns.pointplot('size', 'total_bill', 'sex', tips, dodge=True)

# Fill gap with manual line plot
ax = sns.pointplot('size', 'total_bill', 'sex', tips, dodge=True, join=False)

# Loop over the collections of point in the axes and the grouped data frame
for points, (gender_name, gender_slice) in zip(ax.collections, tips.groupby('sex')):
    # Retrieve the x axis positions for the points
    x_coords = [coord[0] for coord in points.get_offsets()]
    # Manually calculate the mean y-values to use with the line
    means = gender_slice.groupby(['size']).mean()['total_bill']
    ax.plot(x_coords, means, lw=2)

来源：https://stackoverflow.com/questions/46795504/connecting-non-adjacent-data-points-in-seaborn-pointplot

标签

python

matplotlib

seaborn