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# Copyright 2013 Christian Sigg
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# A copy of the GNU General Public License is available at
# http://www.r-project.org/Licenses/
#' Cardinality of Column Vectors
#'
#' Computes the cardinality (the sum of non-zero elements) of each column of
#' the matrix \eqn{\mathbf{W}}{W}.
#'
#' @export
#' @param w a numeric matrix, e.g. the rotation matrix of a sparse PCA analysis
cardinality <- function(w) {
return(colSums(abs(as.matrix(w)) > 0))
}
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