#  File src/library/stats/R/deriv.R
#  Part of the R package, http://www.R-project.org
#
#  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 of the License, or
#  (at your option) any later version.
#
#  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/

D <- function(expr, name) .Internal(D(expr, name))

deriv <- function(expr, ...) UseMethod("deriv")

deriv.formula <- function(expr, namevec, function.arg=NULL, tag=".expr",
                          hessian = FALSE, ...)
{
    if((le <- length(expr)) > 1)
	.Internal(deriv.default(expr[[le]], namevec, function.arg, tag, hessian))
    else stop("invalid formula in deriv")
}

deriv.default <- function(expr, namevec, function.arg=NULL, tag=".expr",
                          hessian = FALSE, ...)
    .Internal(deriv.default(expr, namevec, function.arg, tag, hessian))

deriv3 <- function(expr, ...) UseMethod("deriv3")

deriv3.formula <- function(expr, namevec, function.arg=NULL, tag=".expr",
                          hessian = TRUE, ...)
{
    if((le <- length(expr)) > 1)
	.Internal(deriv.default(expr[[le]], namevec, function.arg, tag, hessian))
    else stop("invalid formula in deriv")
}

deriv3.default <- function(expr, namevec, function.arg=NULL, tag=".expr",
                          hessian = TRUE, ...)
    .Internal(deriv.default(expr, namevec, function.arg, tag, hessian))