root(method=’broyden2’)#
- scipy.optimize.root(fun, x0, args=(), method='hybr', jac=None, tol=None, callback=None, options=None)
- See also - For documentation for the rest of the parameters, see - scipy.optimize.root- Options:
- ——-
- nitint, optional
- Number of iterations to make. If omitted (default), make as many as required to meet tolerances. 
- dispbool, optional
- Print status to stdout on every iteration. 
- maxiterint, optional
- Maximum number of iterations to make. 
- ftolfloat, optional
- Relative tolerance for the residual. If omitted, not used. 
- fatolfloat, optional
- Absolute tolerance (in max-norm) for the residual. If omitted, default is 6e-6. 
- xtolfloat, optional
- Relative minimum step size. If omitted, not used. 
- xatolfloat, optional
- Absolute minimum step size, as determined from the Jacobian approximation. If the step size is smaller than this, optimization is terminated as successful. If omitted, not used. 
- tol_normfunction(vector) -> scalar, optional
- Norm to use in convergence check. Default is the maximum norm. 
- line_search{None, ‘armijo’ (default), ‘wolfe’}, optional
- Which type of a line search to use to determine the step size in the direction given by the Jacobian approximation. Defaults to ‘armijo’. 
- jac_optionsdict, optional
- Options for the respective Jacobian approximation. - alphafloat, optional
- Initial guess for the Jacobian is (-1/alpha). 
- reduction_methodstr or tuple, optional
- Method used in ensuring that the rank of the Broyden matrix stays low. Can either be a string giving the name of the method, or a tuple of the form - (method, param1, param2, ...)that gives the name of the method and values for additional parameters.- Methods available: - restart: drop all matrix columns. Has no extra parameters.
- simple: drop oldest matrix column. Has no extra parameters.
- svd: keep only the most significant SVD components. Takes an extra parameter,- to_retain, which determines the number of SVD components to retain when rank reduction is done. Default is- max_rank - 2.
 
- max_rankint, optional
- Maximum rank for the Broyden matrix. Default is infinity (i.e., no rank reduction).