findRoots function

Non Linear Equation System Solving

A wrapper around nleqslv from the nleqslv package to solve a non linear system of equations. latin1

findRoots(beta.init, eq.func, d.eq.func = NULL, arg.list, ...)

Arguments

• beta.init: An initial guess for the zero.
• eq.func: A function of two variables for which the zero are sought. Its first argument beta should be a vector over which the zeros are sought and the second argument arg.list a list of additional arguments.
• d.eq.func: A function to return the Jacobian of eq.func taking the same arguments as eq.func. Supplying this function can speed up calculations. Default is NULL.
• arg.list: The second argument to eq.func and d.eq.func
• ...: A list of additional arguments to be passed to nleqslv

Details

findRoots calculates zeros fo the function eq.func

and is the default equation solving function in drgee. It is supplied as a separate function in order to allow users to use other equation solvers by writing their own wrapper with the same interface as findRoots.

Returns

The value is a list containing the following arguments: - roots: The zero(s) of the function eq.func.

• optim.object: The optimization object returned from nleqslv.

Author(s)

Johan Zetterqvist, Arvid

See Also

nleqslv in package nleqslv.