R/util.R

In umich-cphds/minet: Variable Selection for Multiply Imputed Data

# soft threshold function
S <- function(x, t)
{
  if (x > t)
    x - t
  else if (x < -t)
    x + t
  else
    0
}

# Overcomes a technical limitation of R that drops almost all attributes from
# objects when subsetted using `[`
subset_scaled_matrix <- function(x, rows)
{
  .x <- x[rows, , drop = F]
  attr(.x, "scaled:center") <- attr(x, "scaled:center")
  attr(.x, "scaled:scale")  <- attr(x, "scaled:scale")
  .x
}