R/which.max.ind.R

In ehrlinger/l2boost: Exploring Friedman's Boosting Algorithm for Regularized Linear Regression

# This is a hidden function of the l2boost package.

# determines which index maximizes a vector, with some elements excluded
# 
# @param vec values to maximize
# @param exclude vector of indices to exclud
# 
which.max.ind <- function(vec, exclude = NULL) {
  if (!is.null(exclude)) {
    if (length(vec[-exclude]) == 0) return(NULL)
    max.ind <- which(vec == max(vec[-exclude], na.rm = TRUE))
    setdiff(max.ind, exclude)
  }
  else {
    which(vec == max(vec, na.rm = TRUE))
  }
}