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: freezeColors.m
    path of file: ./repos/mpsim/lib/plot
    
    the code of the file until where you have to start completion: function freezeColors(varargin)
% freezeColors  Lock colors of plot, enabling multiple colormaps per figure. (v2.3)
%
%   Problem: There is only one colormap per figure. This function provides
%       an easy solution when pl
    
function [h, nancolor] = checkArgs(args)
% checkArgs  Validate input arguments to freezeColors

nargs = length(args);
error(nargchk(0,3,nargs,'struct'))

%grab handle from first argument if we have an odd number of arguments
if mod(nargs,2),
    h = args{1};
    if ~ishandle(h),
        error('JRI:freezeColors:checkArgs:invalidHandle',...
            'The first argument must be a valid graphics handle (to an axis)')
    end