import numpy as np
import holoviews as hv
from holoviews import dim, opts

hv.extension('matplotlib')

np.random.seed(12)
coords = np.random.rand(50,2)
points = hv.Points(coords)

points.opts(color='k', marker='+', s=50)

points + points[0.6:0.8,0.2:0.5]

np.random.seed(10)
data = np.random.rand(100,4)

points = hv.Points(data, vdims=['z', 'size'])
(points + points[0.3:0.7, 0.3:0.7].hist()).opts(
    opts.Points(color='z', s=dim('size')*50))