www.gusucode.com > signal 工具箱matlab源码程序 > signal/@dfilt/@dfsymfir/sumstr.m
function str = sumstr(Hd) % SUMSTR Returns the list of signs for the summer block. % This should be a private method. % Author(s): Don Orofino, V. Pellissier % Copyright 1988-2002 The MathWorks, Inc. str = '++';