```
# Copyright (C) 2005, 2006 Heather Turner
#
# 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 or 3 of the License
# (at your option).
#
# 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/
model.matrix.gnm <- function(object, coef = NULL, ...) {
if (!"x" %in% names(object) || !is.null(coef)) {
xcall <- object$call
xcall$method <- "model.matrix"
xcall$constrain <- object$constrain
xcall$constrainTo <- object$constrainTo
xcall$data <- model.frame(object)
xcall[c("weights", "offset")] <- NULL
xcall$verbose <- FALSE
if (!is.null(coef))
xcall$start <- coef
else
xcall$start <- coef(object)
eval(xcall)
}
else object[[match("x", names(object))]]
}
```

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