How to plot multiple Seaborn Jointplot in Subplot

Question

I'm having problem placing Seaborn Jointplot inside a multicolumn subplot.

import pandas as pd import seaborn as sns  df = pd.DataFrame({'C1': {'a': 1,'b': 15,'c': 9,'d': 7,'e': 2,'f': 2,'g': 6,'h': 5,'k': 5,'l': 8},           'C2': {'a': 6,'b': 18,'c': 13,'d': 8,'e': 6,'f': 6,'g': 8,'h': 9,'k': 13,'l': 15}})  fig = plt.figure();    ax1 = fig.add_subplot(121);   ax2 = fig.add_subplot(122);  sns.jointplot("C1", "C2", data=df, kind='reg', ax=ax1) sns.jointplot("C1", "C2", data=df, kind='kde', ax=ax2) 

Notice how only a portion of the jointplot is placed inside the subplot and the rest left inside another two plot frames. What I'd want is to have both the distributions also inserted inside the subplots.

Can anyone help with this?

Answer 1

Moving axes in matplotlib is not as easy as it used to be in previous versions. The below is working with the current version of matplotlib.

As has been pointed out at several places (this question, also this issue) several of the seaborn commands create their own figure automatically. This is hardcoded into the seaborn code, so there is currently no way to produce such plots in existing figures. Those are PairGrid, FacetGrid, JointGrid, pairplot, jointplot and lmplot.

There is a seaborn fork available which would allow to supply a subplot grid to the respective classes such that the plot is created in a preexisting figure. To use this, you would need to copy the axisgrid.py from the fork to the seaborn folder. Note that this is currently restricted to be used with matplotlib 2.1 (possibly 2.0 as well).

An alternative could be to create a seaborn figure and copy the axes to another figure. The principle of this is shown in this answer and could be extended to Searborn plots. The implementation is a bit more complicated that I had initially expected. The following is a class SeabornFig2Grid that can be called with a seaborn grid instance (the return of any of the above commands), a matplotlib figure and a subplot_spec, which is a position of a gridspec grid.

Note: This is a proof of concept, it may work for most easy cases, but I would not recommend using it in production code.

import matplotlib.pyplot as plt import matplotlib.gridspec as gridspec import seaborn as sns import numpy as np  class SeabornFig2Grid():      def __init__(self, seaborngrid, fig,  subplot_spec):         self.fig = fig         self.sg = seaborngrid         self.subplot = subplot_spec         if isinstance(self.sg, sns.axisgrid.FacetGrid) or \             isinstance(self.sg, sns.axisgrid.PairGrid):             self._movegrid()         elif isinstance(self.sg, sns.axisgrid.JointGrid):             self._movejointgrid()         self._finalize()      def _movegrid(self):         """ Move PairGrid or Facetgrid """         self._resize()         n = self.sg.axes.shape[0]         m = self.sg.axes.shape[1]         self.subgrid = gridspec.GridSpecFromSubplotSpec(n,m, subplot_spec=self.subplot)         for i in range(n):             for j in range(m):                 self._moveaxes(self.sg.axes[i,j], self.subgrid[i,j])      def _movejointgrid(self):         """ Move Jointgrid """         h= self.sg.ax_joint.get_position().height         h2= self.sg.ax_marg_x.get_position().height         r = int(np.round(h/h2))         self._resize()         self.subgrid = gridspec.GridSpecFromSubplotSpec(r+1,r+1, subplot_spec=self.subplot)          self._moveaxes(self.sg.ax_joint, self.subgrid[1:, :-1])         self._moveaxes(self.sg.ax_marg_x, self.subgrid[0, :-1])         self._moveaxes(self.sg.ax_marg_y, self.subgrid[1:, -1])      def _moveaxes(self, ax, gs):         #https://stackoverflow.com/a/46906599/4124317         ax.remove()         ax.figure=self.fig         self.fig.axes.append(ax)         self.fig.add_axes(ax)         ax._subplotspec = gs         ax.set_position(gs.get_position(self.fig))         ax.set_subplotspec(gs)      def _finalize(self):         plt.close(self.sg.fig)         self.fig.canvas.mpl_connect("resize_event", self._resize)         self.fig.canvas.draw()      def _resize(self, evt=None):         self.sg.fig.set_size_inches(self.fig.get_size_inches()) 

The usage of this class would look like this:

import matplotlib.pyplot as plt import matplotlib.gridspec as gridspec import seaborn as sns; sns.set() import SeabornFig2Grid as sfg   iris = sns.load_dataset("iris") tips = sns.load_dataset("tips")  # An lmplot g0 = sns.lmplot(x="total_bill", y="tip", hue="smoker", data=tips,                  palette=dict(Yes="g", No="m")) # A PairGrid g1 = sns.PairGrid(iris, hue="species") g1.map(plt.scatter, s=5) # A FacetGrid g2 = sns.FacetGrid(tips, col="time",  hue="smoker") g2.map(plt.scatter, "total_bill", "tip", edgecolor="w") # A JointGrid g3 = sns.jointplot("sepal_width", "petal_length", data=iris,                    kind="kde", space=0, color="g")   fig = plt.figure(figsize=(13,8)) gs = gridspec.GridSpec(2, 2)  mg0 = sfg.SeabornFig2Grid(g0, fig, gs[0]) mg1 = sfg.SeabornFig2Grid(g1, fig, gs[1]) mg2 = sfg.SeabornFig2Grid(g2, fig, gs[3]) mg3 = sfg.SeabornFig2Grid(g3, fig, gs[2])  gs.tight_layout(fig) #gs.update(top=0.7)  plt.show() 

Note that there might be several drawbacks from copying axes and the above is not (yet) tested thoroughly.

Answer 2

It can not be easily done without hacking. jointplot calls JointGrid method, which in turn creates a new figure object every time it is called.

Therefore, the hack is to make two jointplots (JG1 JG2), then make a new figure, then migrate the axes objects from JG1 JG2 to the new figure created.

Finally, we adjust the sizes and the positions of subplots in the new figure we just created.

JG1 = sns.jointplot("C1", "C2", data=df, kind='reg') JG2 = sns.jointplot("C1", "C2", data=df, kind='kde')  #subplots migration f = plt.figure() for J in [JG1, JG2]:     for A in J.fig.axes:         f._axstack.add(f._make_key(A), A)  #subplots size adjustment f.axes[0].set_position([0.05, 0.05, 0.4,  0.4]) f.axes[1].set_position([0.05, 0.45, 0.4,  0.05]) f.axes[2].set_position([0.45, 0.05, 0.05, 0.4]) f.axes[3].set_position([0.55, 0.05, 0.4,  0.4]) f.axes[4].set_position([0.55, 0.45, 0.4,  0.05]) f.axes[5].set_position([0.95, 0.05, 0.05, 0.4]) 

It is a hack because we are now using _axstack and _add_key private methods, which might and might not stay the same as they are now in matplotlib future versions.