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Eigen-unsupported
3.4.90 (git rev 67eeba6e720c5745abc77ae6c92ce0a44aa7b7ae)
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Finds a zero of a system of n nonlinear functions in n variables by a modification of the Powell hybrid method ("dogleg").
The user must provide a subroutine which calculates the functions. The Jacobian is either provided by the user, or approximated using a forward-difference method.