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: add_text_label.m
    path of file: ./repos/CanlabCore/CanlabCore/canlab_canonical_brains
    
    the code of the file until where you have to start completion: function texth = add_text_label(cl, mytext, mycolor, varargin)
%
% texth = add_text_label(cl, mytext, mycolor, varargin)
% 
% For making movies and adding text easily

yplus = 0;
xplus = 0;
zplus = 0;

for i = 1:length(varargin)
    if ischar(varargin{i})
        switch varargin{i}

            % functional commands

    
function texth = add_text_label(cl, mytext, mycolor, varargin)
%
% texth = add_text_label(cl, mytext, mycolor, varargin)
% 
% For making movies and adding text easily

yplus = 0;
xplus = 0;
zplus = 0;

for i = 1:length(varargin)
    if ischar(varargin{i})
        switch varargin{i}

            % functional commands
            case 'yplus', yplus = varargin{i+1};
            case 'xplus', xplus = varargin{i+1};
            case 'zplus', zplus = varargin{i+1};
    
            otherwise, warning(['Unknown input string option:' varargin{i}]);
        end