numericDeriv numerically evaluates the gradient of an expression.
The expression to be differentiated. The value of this expression should be a numeric vector.
A character vector of names of numeric variables
An environment containing all the variables needed to
A numeric vector of directions to use for the finite differences.
This is a front end to the C function
numeric_deriv, which is
described in Writing R Extensions.
The numeric variables must be of type
real and not
The value of
eval(expr, envir = rho) plus a matrix
gradient. The columns of this matrix are
the derivatives of the value with respect to the variables listed in
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