```
# Modification of model.frame.glm from the stats package for R.
#
# Copyright (C) 1995-2005 The R Core Team
# 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.frame.gnm <- function (formula, ...)
{
dots <- list(...)
nargs <- dots[match(c("data", "na.action", "subset"), names(dots),
0)]
if (length(nargs) || is.null(formula$model)) {
fcall <- formula$call
fcall$method <- "model.frame"
fcall[[1]] <- as.name("gnm")
fcall[names(nargs)] <- nargs
env <- environment(formula$terms)
if (is.null(env))
env <- parent.frame()
eval(fcall, env)
}
else formula$model
}
```

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