Source: https://d3js.org/d3-scale/symlog

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Symlog scales ​

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See A bi-symmetric log transformation for wide-range data by Webber for details. Unlike a log scale , a symlog scale domain can include zero.

scaleSymlog(domain, range) ​

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Examples · Source · Constructs a new continuous scale with the specified domain and range , the constant 1, the default interpolator and clamping disabled.

js

const x = d3.scaleSymlog([0, 100], [0, 960]);

If a single argument is specified, it is interpreted as the range. If either domain or range are not specified, each defaults to [0, 1].

js

const color = d3.scaleSymlog(["red", "blue"]) // default domain of [0, 1]

symlog.constant(constant) ​

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Examples · Source · If constant is specified, sets the symlog constant to the specified number and returns this scale. The constant defaults to 1.

js

const x = d3.scaleSymlog([0, 100], [0, 960]).constant(2);

If constant is not specified, returns the current value of the symlog constant.

js

x.constant() // 2