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#' Determine Height of a Tree
#'
#' Returns height of a SEM Tree, which equals to the length of the longest path
#' from root to a terminal node.
#'
#'
#' @param tree A SEM tree.
#' @author Andreas M. Brandmaier, John J. Prindle
#' @references Brandmaier, A.M., Oertzen, T. v., McArdle, J.J., & Lindenberger,
#' U. (2013). Structural equation model trees. \emph{Psychological Methods},
#' 18(1), 71-86.
getHeight <- function(tree)
{
if ((is.null(tree$left_child)) && (is.null(tree$right_child)))
{
return(1);
}
if (tree$left_child$caption != "TERMINAL") {
countl <- 1+ getHeight(tree$left_child)
} else {
countl <- 2
}
if (tree$right_child$caption != "TERMINAL") {
countr <- 1+ getHeight(tree$right_child)
} else {
countr <- 2
}
return( max(countl, countr) )
}
#' Get the depth (or, height) a tree.
#'
#' Returns the length of the longest path from a root node to a leaf node.
#'
#'
#' @param tree A \code{\link{semtree}} object
#' @author Andreas M. Brandmaier
#' @references Brandmaier, A.M., Oertzen, T. v., McArdle, J.J., & Lindenberger,
#' U. (2013). Structural equation model trees. \emph{Psychological Methods},
#' 18(1), 71-86.
#' @export
getDepth <- getHeight
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