NAME:
	rdraw
PURPOSE:
	Read and return a two dimensional byte array from a raw animation file.
CATEGORY:
  File I/O
CALLING SEQUENCE:
	vec=rdraw('myfile.dat',640,480)
INPUTS:
	filename = string containing the name of the file to read.
	ncols    = number of columns in image
	nrows    = number of rows in image
OUTPUTS:
	returns the vector
REVISION HISTORY:
	Written by Marc Buie on 4/24/91
COMMENTS: