symlog: Symmetric log transform and function.

In hlplab/MVBeliefUpdatr: Fitting, Summarizing, and Visualizing of Multivariate Gaussian Ideal Observers and Adaptors

Symmetric log transform and function.

Description

Makes it possible to use log-stepped scales or coordinate systems even when negative values are included in the data. E.g., in 'coord_trans(x = "symlog")'. 'symlog“ applies a modified logarithm scale to the specified or current axes that handles negative values while maintaining continuity across zero:

Usage

symlog(x, C = 0)

inv_symlog(x, C = 0)

symlog_trans()

Details

y = sign(x) * log10(1 + abs(x) / 10^C )

where the scaling constant C determines the resolution of the data around zero. The smallest order of magnitude shown on either side of zero will be 10^ceil(C). If applies as a transform for a ggplot2 coordinate system, C is taken to be 0.

Taken from https://www.mathworks.com/matlabcentral/fileexchange/57902-symlog.

References

Webber (2012). Measurement Science and Technology .

hlplab/MVBeliefUpdatr documentation built on March 29, 2025, 10:42 p.m.