R/internal.R

In ssdtools: Species Sensitivity Distributions

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# Copyright 2021 Environment and Climate Change Canada
# Copyright 2023-2024 Australian Government Department of Climate Change,
# Energy, the Environment and Water
#
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#
#       https://www.apache.org/licenses/LICENSE-2.0
#
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identical_parameters <- function(x) {
  length(unique(npars(x))) < 2
}

probs <- function(level) {
  probs <- (1 - level) / 2
  c(probs, 1 - probs)
}

safely <- function(.f) {
  function(...) {
    x <- try(.f(...), silent = TRUE)
    if (inherits(x, "try-error")) {
      return(list(result = NULL, error = as.character(x)))
    }
    list(result = x, error = NULL)
  }
}

pow <- function(x, y) x^y

root <- function(p, f) {
  q <- rep(NA_real_, length(p))
  for (i in seq_along(p)) {
    q[i] <- stats::uniroot(f, p = p[i], lower = 0, upper = 1, extendInt = "upX", tol = .Machine$double.eps)$root
  }
  q
}