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Lets-Plot for Python

v4.3.2

lets_plot.scale_color_viridis#

lets_plot.scale_color_viridis(alpha=None, begin=None, end=None, direction=None, option=None, name=None, breaks=None, labels=None, lablim=None, limits=None, na_value=None, guide=None, trans=None, format=None)#

The viridis color maps are designed to be perceptually-uniform, both in regular form and also when converted to black-and-white.

The viridis color scales are suitable for viewers with common forms of colour blindness. See also https://bids.github.io/colormap/.

Parameters:
alphafloat, default=1.0

Alpha transparency channel. (0 means transparent and 1 means opaque).

beginfloat, default=0.0

Correspond to a color hue to start at. Accept values between 0 and 1. Should be less than end.

endfloat, default=1.0

Correspond to a color hue to end with. Accept values between 0 and 1. Should be greater than begin.

direction{1, -1}, default=1

Set the order of colors in the scale. If -1, the order of colors is reversed.

optionstr, default=”D” (or “viridis”)
The colormap to use:

  • “magma” (or “A”),

  • “inferno” (or “B”)

  • “plasma” (or “C”)

  • “viridis” (or “D”)

  • “cividis” (or “E”)

  • “turbo”

  • “twilight”

namestr

The name of the scale - used as the axis label or the legend title. If None, the default, the name of the scale is taken from the first mapping used for that aesthetic.

breakslist or dict

A list of data values specifying the positions of ticks, or a dictionary which maps the tick labels to the breaks values.

labelslist of str or dict

A list of labels on ticks, or a dictionary which maps the breaks values to the tick labels.

lablimint, default=None

The maximum label length (in characters) before trimming is applied.

limitslist

Continuous scale: a numeric vector of length two providing limits of the scale. Discrete scale: a vector specifying the data range for the scale and the default order of their display in guides.

na_value

Missing values will be replaced with this value.

guide

Guide to use for this scale. It can either be a string (‘colorbar’, ‘legend’) or a call to a guide function (guide_colorbar(), guide_legend()) specifying additional arguments. ‘none’ will hide the guide.

trans{‘identity’, ‘log10’, ‘log2’, ‘symlog’, ‘sqrt’, ‘reverse’}

Name of built-in transformation.

formatstr

Define the format for labels on the scale. The syntax resembles Python’s:

  • ‘.2f’ -> ‘12.45’

  • ‘Num {}’ -> ‘Num 12.456789’

  • ‘TTL: {.2f}$’ -> ‘TTL: 12.45$’

For more info see https://lets-plot.org/python/pages/formats.html.

Returns:
FeatureSpec

Scale specification.

Notes

Can be used for both, continuous and discrete data.

Examples

1from lets_plot import *
2LetsPlot.setup_html()
3x = list(range(10))
4ggplot({'x': x, 'y': x}, aes('x', 'y')) + \
5    geom_point(aes(color='x'), shape=13, size=5) + \
6    scale_color_viridis(option='cividis', direction=-1)
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