function ab=set_use_sign_output(ab, b) ;% ab=set_use_sign_output(ab, b) ;%   G. Raetsch 10.12.99%   Copyright (c) 1998,1999  GMD Berlin - All rights reserved%   THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE of GMD FIRST Berlin%   The copyright notice above does not evidence any%   actual or intended publication of this work.%   Please see COPYRIGHT.txt for details.ab.use_sign_output=b ;