R/extract_sparse_parts.R

Defines functions extract_sparse_parts

Documented in extract_sparse_parts

# This file is part of RStan
# Copyright (C) 2015 Jiqiang Guo, Benjamin Goodrich, and Krzysztof Sakrejda
#
# RStan 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 3
# of the License, or (at your option) any later version.
#
# RStan 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.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

extract_sparse_parts <- function(A) {
  if (!requireNamespace("Matrix")) 
    stop("You have to install the Matrix package to call 'extract_sparse_parts'")
  if (class(A) == 'matrix') 
    A <- Matrix::Matrix(A, sparse=TRUE)
  A <- Matrix::t(A)
  A <- as(A, "dgCMatrix")
  return(.Call(extract_sparse_components, A))
}

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rstan documentation built on Nov. 8, 2018, 1:04 a.m.