Log transformations — transform

transform_log(): log(x)
log1p(): log(x + 1)
transform_pseudo_log(): smoothly transition to linear scale around 0.

Usage

transform_log(base = exp(1))

transform_log10()

transform_log2()

transform_log1p()

log_trans(base = exp(1))

log10_trans()

log2_trans()

log1p_trans()

transform_pseudo_log(sigma = 1, base = exp(1))

pseudo_log_trans(sigma = 1, base = exp(1))

Arguments

base: base of logarithm
sigma: Scaling factor for the linear part of pseudo-log transformation.

Examples

plot(transform_log2(), xlim = c(0, 5))

plot(transform_log(), xlim = c(0, 5))

plot(transform_log10(), xlim = c(0, 5))


plot(transform_log(), xlim = c(0, 2))

plot(transform_log1p(), xlim = c(-1, 1))


# The pseudo-log is defined for all real numbers
plot(transform_pseudo_log(), xlim = c(-5, 5))
lines(transform_log(), xlim = c(0, 5), col = "red")


# For large positives numbers it's very close to log
plot(transform_pseudo_log(), xlim = c(1, 20))
lines(transform_log(), xlim = c(1, 20), col = "red")