swh:1:snp:33a53053e50f7abe7d281cc0c803be827debf4a3
Tip revision: 1b2742a3d71abc7fbde73ca141b23e1375f185bf authored by Edzer Pebesma on 30 October 2011, 00:00:00 UTC
version 1.0-9
version 1.0-9
Tip revision: 1b2742a
gstat.formula.R
# $Id: gstat.formula.q,v 1.8 2007-06-08 06:45:52 edzer Exp $
"gstat.formula" <-
function (formula, data)
{
# check for duplicated pixels; if yes coerce to SpatialPointsDataFrame:
if (is(data, "SpatialPixels") && anyDuplicated(data@grid.index) != 0)
gridded(data) = FALSE
m = model.frame(terms(formula), as(data, "data.frame"))
Y = model.extract(m, "response")
if (length(Y) == 0)
stop("no response variable present in formula")
Terms = attr(m, "terms")
X = model.matrix(Terms, m)
has.intercept = attr(Terms, "intercept")
if (gridded(data))
grid = gridparameters(data)
else
grid = numeric(0)
list(y = Y, locations = coordinates(data), X = X, call = call,
has.intercept = has.intercept, grid = as.double(unlist(grid)))
}