undo_minmax function

Reverse minmax scaling of numeric vector

Helper function to reverse minmax scaling applied in the pre-processing step.

undo_minmax(s, s_min, s_max)

Arguments

• s: A numeric vector or column, scaled between 0 and 1.
• s_min: A numeric value, the minimum of the unscaled vector
• s_max: A numeric value, the maximum of the unscaled vector

Returns

Vector re-scaled using original parameters s_min and s_max

Examples

ex_num <- runif(100,1,10)
scaled <- col_minmax(ex_num)
undo_scale <- undo_minmax(scaled, s_min = min(ex_num), s_max = max(ex_num))

# Prove two are identical
all.equal(ex_num, undo_scale)