Pure Newton minimisation.
Function options
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func - The function to minimise.
dfunc - The function which returns the gradient vector.
d2func - The function which returns the hessian matrix.
x0 - The initial parameter vector.
args - The tuple of arguments to supply to the functions func, dfunc, and d2func.
tol - The cutoff value used to terminate minimisation by comparison to the difference in function values between iterations.
maxiter - The maximum number of iterations.
full_output - A flag specifying what should be returned (see below).
print_flag - A flag specifying how much information should be printed to standard output during minimisation:
The print flag corresponds to:
0 - No output.
1 - Minimal output.
2 - Full output.
Returned objects
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If full_output=0, then only the minimised parameter vector is returned.
If full_output=1, then the minimised parameter vector, function value at the minimum, number of iterations, and a warning flag are returned.
The warning flag corresponds to:
0 - Minimisation terminated successfully.
1 - Maximum number of iterations have been reached.
Internal variables
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k - The iteration number.
xk - Parameter vector at iteration number k.
fk - Function value at xk.
fk_last - Function value at xk-1.
dfk - Gradient vector at xk.
d2fk - Hessian matrix at xk.
pk - Descent direction of the iteration number k.
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