R/genhypmatrix.R

In skpr: Design of Experiments Suite: Generate and Evaluate Optimal Designs

#'@title Generate Hypothesis Matrix
#'
#'@description Generates hypothesis matrix for power calculation
#'
#'@param parameters Number of parameters total in model
#'@param levels Number of levels in parameter of interest
#'@param g Number of levels/parameters preceding parameter of interest
#'@return The parameter matrix L isolating the levels of parameter of interest
#'@keywords internal
genhypmatrix = function(parameters, levels, g) {
  if (parameters <= 0 | levels <= 0 | g <= 0) {
    stop("skpr: All inputs must be greater than zero")
  }
  if (parameters < levels) {
    stop("skpr: Number of parameters must be greater than number of levels")
  }
  if (g + levels - 1 > parameters) {
    stop("skpr: Too many parameters/levels")
  }
  L = matrix(0, ncol = parameters, nrow = levels - 1)
  L[, (g + 1):(g + levels - 1)] = diag(levels - 1)
  if (dim(L)[1] == 1) {
    return(t(as.vector(L)))
  }
  return(L)
}