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: topoimage.m
    path of file: ./repos/eeglab/functions/miscfunc
    
    the code of the file until where you have to start completion: % TOPOIMAGE - plot concatenated multichannel time/frequency images 
%               in a topographic format
%               Uses a channel location file with the same format as TOPOPLOT 
%               or else plots data on a rectangular grid of axes.
%               Click on individual images to examine separately.
%
% Usage:
%    >> topoimage(data,'chan_locs',ntimes,limits);
%    >> t
    
function topoimage(data,loc_file,times,limits,plottitle,channels,axsize,colors,ydr,rmbas)

% Options:
% LOGIT = 1; % comment out for non-log imaging
% YVAL = 10;          % plot horizontal lines at 10 Hz (comment to omit)
% RMBASE = 0;  % remove <0 mean for each image row 

MAXCHANS = 256;
DEFAULT_AXWIDTH  = 0.08;
DEFAULT_AXHEIGHT = 0.07;
DEFAULT_SIGN = 1;   % Default - plot positive-up
LINEWIDTH = 2.0;
FONTSIZE = 14;      % font size to use for labels
CHANFONTSIZE = 10;  % font size to use for channel names
TICKFONTSIZE=10;    % font size to use for axis labels
TITLEFONTSIZE = 16;

PLOT_WIDTH = 0.75;  % width and height of plot array on figure!
PLOT_HEIGHT = 0.81;
ISRECT = 0;         % default

if nargin < 1,
    help topoimage
    return
end

if nargin < 4,
    help topoimage
    error('topoimage(): needs four arguments');
end

if times <0,
    help topoimage
    return
elseif times==1,
    fprintf('topoimage: cannot plot less than 2 times per image.\n');
    return
else
    freqs = 0;
end

axcolor= get(0,'DefaultAxesXcolor'); % find what the default x-axis color is
plotfile = 'topoimage.ps';
ls_plotfile = 'ls -l topoimage.ps';

%
%%%%%%%%%%%%%%%%%%%%%%%%%% Substitute defaults for missing parameters %%%%%
%
SIGN = DEFAULT_SIGN;
if nargin < 10
   rmbas = 0;
end