Add RGGPlot reference notebook or gallery example

[MarcSkovMadsen]

As a part of adding docstrings to Panes I discovered the RGGPlot pane.

I was not aware of its existence and guess other users would be in the same situation.

Please add a reference notebook or gallery example.

[maximlt]

I just tried this Pane, not publishing a new reference example as we are reworking this part and it may change, but I'll record in this issue some instructions to create an example with this pane.

• Install panel, rpy2, r-ggplot2 and r-lazyeval from conda-forge
• Adapted a rpy2/ggplot2 example from https://rpy2.github.io/doc/v2.9.x/html/graphics.html#package-ggplot2

from rpy2.robjects.vectors import IntVector
from rpy2.robjects.packages import importr, data
from rpy2 import robjects
import rpy2.robjects.lib.ggplot2 as ggplot2

base = importr('base')
stats = importr('stats')
datasets = importr('datasets')

mtcars = data(datasets).fetch('mtcars')['mtcars']

rnorm = stats.rnorm
dataf_rnorm = robjects.DataFrame({'value': rnorm(300, mean=0) + rnorm(100, mean=3),
                                  'other_value': rnorm(300, mean=0) + rnorm(100, mean=3),
                                  'mean': IntVector([0, ]*300 + [3, ] * 100)})

gp = ggplot2.ggplot(mtcars)

pp = gp + \
     ggplot2.aes_string(x='wt', y='mpg') + \
     ggplot2.geom_point()

import panel as pn

pn.extension()

pn.pane.RGGPlot(pp)