Create a Pseudo-Log LL4 Transformation Object for ggplot2

Generates a scales::trans object using the ll4 transformation. This transformation object can be passed to the trans argument of ggplot2::scale_x_continuous or ggplot2::scale_y_continuous. It's designed for non-negative data and handles zero values gracefully. The "pseudo" aspect is conceptual, similar to pseudo_log_trans in that it handles a range including zero, but the transformation is ll4.

Usage

pseudo_ll4_trans(lambda = 4)

Arguments

lambda

A positive numeric scalar, the lambda parameter for the ll4 transformation. Default is 4.

Value

A trans object (from the scales package).

See also

ll4, ll4_inv, trans_new

Examples

# \donttest{
if (require(ggplot2) && require(scales)) {
  set.seed(123)
  df <- data.frame(
    x_vals = c(0, 0.01, 0.1, 1, 10, 100, 1000, NA), # Include 0 and NA
    y_vals = c(0, 10, 50, 100, 500, 1000, 2000, 50)
  )

  # Using pseudo_ll4_trans for the y-axis
  ggplot(df, aes(x = x_vals, y = y_vals)) +
    geom_point() +
    scale_y_continuous(trans = pseudo_ll4_trans(lambda = 4),
                       name = "Y-Values (Pseudo-LL4 Scale)") +
    ggtitle("Y-Axis with Pseudo-LL4 Transformation")

  # Using pseudo_ll4_trans for the x-axis
  ggplot(df, aes(x = x_vals, y = y_vals)) +
    geom_point() +
    scale_x_continuous(trans = pseudo_ll4_trans(lambda = 2), # Different lambda
                       name = "X-Values (Pseudo-LL4 Scale)") +
    ggtitle("X-Axis with Pseudo-LL4 Transformation")
}
#> Loading required package: scales
#> Warning: Removed 1 row containing missing values or values outside the scale range
#> (`geom_point()`).

# }