lets_plot.geom_bin2d

lets_plot.geom_bin2d(mapping=None, *, data=None, stat=None, position=None, show_legend=None, sampling=None, tooltips=None, bins=None, binwidth=None, drop=None, **other_args)

Displays a 1d distribution by dividing variable mapped to x axis into bins and counting the number of observations in each bin.

Parameters
mappingFeatureSpec

Set of aesthetic mappings created by aes() function. Aesthetic mappings describe the way that variables in the data are mapped to plot “aesthetics”.

datadict or DataFrame

The data to be displayed in this layer. If None, the default, the data is inherited from the plot data as specified in the call to ggplot.

statstr, default=’bin2d’

The statistical transformation to use on the data for this layer, as a string.

positionstr or FeatureSpec, default=’stack’

Position adjustment, either as a string (‘identity’, ‘stack’, ‘dodge’, …), or the result of a call to a position adjustment function.

show_legendbool, default=True

False - do not show legend for this layer.

samplingFeatureSpec

Result of the call to the sampling_xxx() function. Value None (or ‘none’) will disable sampling for this layer.

tooltipslayer_tooltips

Result of the call to the layer_tooltips() function. Specifies appearance, style and content.

binslist of int, default=[30, 30]

Number of bins in both directions, vertical and horizontal. Overridden by binwidth.

binwidthlist of float

The width of the bins in both directions, vertical and horizontal. Overrides bins. The default is to use bin widths that cover the entire range of the data.

dropbool, default=True

Specifies whether to remove all bins with 0 counts.

other_args

Other arguments passed on to the layer. These are often aesthetics settings used to set an aesthetic to a fixed value, like color=’red’, fill=’blue’, size=3 or shape=21. They may also be parameters to the paired geom/stat.

Returns
LayerSpec

Geom object specification.

Notes

geom_bin2d() applies rectangular grid to the plane then counts observation in each cell of the grid (bin). Uses geom_tile() to display counts as a tile fill-color.

Computed variables:

  • ..count.. : number of points with coordinates in the same bin.

geom_bin2d() understands the following aesthetics mappings:

  • x : x-axis value.

  • y : y-axis value.

  • alpha : transparency level of a layer. Understands numbers between 0 and 1.

  • color (colour) : color of a geometry lines. Can be continuous or discrete. For continuous value this will be a color gradient between two colors.

  • fill : color of geometry filling, default: ‘..count..’. Alternatively: ‘..density..’.

  • size : lines width.

  • weight : used by ‘bin’ stat to compute weighted sum instead of simple count.

Examples

1import numpy as np
2from lets_plot import *
3LetsPlot.setup_html()
4np.random.seed(42)
5mean = np.zeros(2)
6cov = np.eye(2)
7x, y = np.random.multivariate_normal(mean, cov, 1000).T
8ggplot({'x': x, 'y': y}, aes(x='x', y='y')) + geom_bin2d()