# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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 Library General Public License for more details.
#
# You should have received a copy of the GNU Library General
# Public License along with this library; if not, write to the
# Free Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA  02111-1307  USA


################################################################################
# GENERATION:               DESCRIPTION:
#  triang                    Extracs the lower tridiagonal part from a matrix
#  Triang                    Extracs the upper tridiagonal part from a matrix
################################################################################


triang <-
function(x)
{
    # A function implemented by Diethelm Wuertz

    # Description:
    #   Returns lower triangle matrix

    # FUNCTION:

    # Triangulate:
    x[row(x) < col(x)] = 0

    # Return Value:
    x
}


# ------------------------------------------------------------------------------


Triang <-
function(x)
{
    # A function implemented by Diethelm Wuertz

    # Description:
    #   Returns upper triangle matrix

    # FUNCTION:

    # Triangulate
    x[row(x) > col(x)] = 0

    # Return Value:
    x
}


################################################################################