You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: elim_and_recalc.m
    path of file: ./repos/d2d/arFramework3/ThirdParty/strike-goldd/STRIKE-GOLDD/functions
    
    the code of the file until where you have to start completion: %--------------------------------------------------------------------------
% Function that determines identifiability of individual parameters one 
% by one, by successive elimination of its column in
    
function [new_ident_pars,new_nonid_pars,new_obs_states,new_unobs_states,new_obs_in,new_unobs_in] = elim_and_recalc(unmeas_xred_indices,rangoinicial,numonx,opts,varargin)

global p x unidflag wlvector

switch nargin 
    case 4 
        % called when there is no decomposition nor 'w'      
        pred          = p;
        xred          = x; 
        wred          = wlvector;
        identifiables = [];
        obs_states    = [];
        obs_inputs    = [];
        q             = numel(pred);
        n             = numel(xred);
        nw            = numel(wred);
        qreal         = q;
    case 7 
        % called when there are 'w', but no decomposition
        pred          = p;
        xred          = x; 
        wred          = wlvector;
        identifiables = varargin{1};
        obs_states    = varargin{2};    
        obs_inputs    = varargin{3};
        q             = numel(pred);
        n             = numel(xred);
        nw            = numel(wred); 
        qreal         = q;
    otherwise
        % called in case of decomposition
        % varargin: qreal,pred,xred,identifiables,obs_states,obs_inputs
        qreal         = varargin{1};
        pred          = varargin{2};
        xred          = varargin{3};
        identifiables = varargin{4};
        obs_states    = varargin{5};    
        obs_inputs    = varargin{6};
        wred          = varargin{7};
        q             = numel(pred);
        n             = numel(xred);
        nw            = numel(wred);
end