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#' Node Impact
#' @description Computes impact measure or how much the average distance in the
#' network changes with that node removed of each node in a network
#' (\strong{Please see and cite Kenett et al., 2011})
#'
#' @param A An adjacency matrix of network data
#'
#' @return A vector of node impact values for each node in the network
#' (impact > 0, greater ASPL when node is removed; impact < 0,
#' lower ASPL when node is removed)
#'
#' @examples
#' # normal set to FALSE for CRAN tests
#' A <- TMFG(neoOpen, normal = FALSE)$A
#'
#' nodeimpact <- impact(A)
#'
#' @references
#' Cotter, K. N., Christensen, A. P., & Silvia, P. J. (in press).
#' Understanding inner music: A dimensional approach to musical imagery.
#' \emph{Psychology of Aesthetics, Creativity, and the Arts}.
#'
#' Kenett, Y. N., Kenett, D. Y., Ben-Jacob, E., & Faust, M. (2011).
#' Global and local features of semantic networks: Evidence from the Hebrew mental lexicon.
#' \emph{PLoS one}, \emph{6}, e23912.
#'
#' @author Alexander Christensen <alexpaulchristensen@gmail.com>
#'
#' @export
#Node Impact----
impact <- function (A)
{
allP <- pathlengths(A)$ASPL
remove <- matrix(0,nrow=nrow(A),ncol=1)
pb <- txtProgressBar(max=ncol(A), style = 3)
for(j in 1:ncol(A))
{
remove[j,]<-(pathlengths(A[-j,-j])$ASPL)-allP
setTxtProgressBar(pb, j)
}
close(pb)
remove <- as.vector(round(remove,3))
names(remove) <- colnames(A)
return(remove)
}
#----
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