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#' @title Feature matrix
#' @author DEZECACHE Camille, PHAN Thi Thu Hong, POISSON-CAILLAULT Emilie
#' @description Store global features of a multivariate signal within a feature matrix.
#' Following .globalfeatures() function, features estimated are:
#' \itemize{
#' \item{minx: }{minimum value of the input vector}
#' \item{maxx: }{maximum value of the input vector}
#' \item{avg: }{average value of the input vector}
#' \item{medianx: }{median of the input vector}
#' \item{std: }{standard deviation of the input vector}
#' \item{momx: }{skewness}
#' \item{nop: }{number of peaks of the input vector}
#' \item{len: }{length of the input vector}
#' \item{entro: }{measure of entropy}
#' }
#' @param data multivariate signal
#' @return returns a matrix with one row, each column giving the value of corresponding estimated feature.
#' Values for each signal (column of the dataset storing the multivariate signal) are concatenated.
#' @keywords internal
#' @examples
#' data(dataDTWUMI)
#' gf <- .features_matrix(dataDTWUMI)
.features_matrix <- function(data){
att <- c()
for (i in 1:ncol(data)){
gf <- .globalfeatures(data[, i])
att <- cbind(att, gf)
}
out <- att
}
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