local_min_rc_test, a FORTRAN90 code which calls local_min_rc(), which seeks a local minimum of a scalar function of a scalar variable, without requiring derivatives, or assuming the function is differentiable, using reverse communication (RC).
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local_min_rc, a FORTRAN90 code which finds a local minimum of a scalar function of a scalar variable, without the use of derivative information, using reverse communication (RC), by Richard Brent.