function X = f(dir,n,Size)
%
% Syntax:  X = read_uchars(dir,n,Size)
%
% Loads the index n unsigned char (1 byte/pixel) DAT images from
% directory dir and returns them in a N-by-M matrix, where N is
% the total dimensionality of the image (nrow*ncol) and M is the
% number of elements in the index vector n

% Author: baback@media.mit.edu
% Date  : 05/23/93

N = length(n);
X = zeros(Size(1)*Size(2),N);
for i=1:N
	fname = [dir '/data' int2str(n(i))];
	fid = fopen(fname);
	if fid==-1
		disp(['ERROR: fopen failed on filename: ' fname])
		return;
	end;	
	x = fread(fid,fliplr(Size),'uchar')';
	fclose(fid);
	X(:,i) = x(:);
end;