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# 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
################################################################################
# FUNCTION: DESCRIPTION:
# grid2d Returns from two vectors x-y grid coordinates
################################################################################
grid2d <-
function(x = (0:10)/10, y = x)
{
# A function implemented by Diethelm Wuertz
# Description:
# Creates from two vectors x-y grid coordinates
# Arguments:
# x, y - two numeric vectors defining the x and y coordinates.
# Value:
# returns a list with two vectors named $x and $y spanning the
# grid defined by the coordinates x and y.
# Example:
# > grid2d(1:3, 1:2)
# $x
# [1] 1 2 3 1 2 3
# $y
# [1] 1 1 1 2 2 2
# FUNCTION:
# Prepare for Input:
nx = length(x)
ny = length(y)
xoy = cbind(rep(x, ny), as.vector(matrix(y, nx, ny, byrow = TRUE)))
XY = matrix(xoy, nx * ny, 2, byrow = FALSE)
# Return Value:
list(x = XY[, 1], y = XY[, 2])
}
################################################################################
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