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function f = thisisscalar(Hd) %THISISSCALAR True if scalar filter. % THISISSCALAR(Hd) returns 1 if Hd is a scalar filter, and 0 otherwise. % % See also DFILT. % Author: Thomas A. Bryan % Copyright 1988-2004 The MathWorks, Inc. % This should be private f = order(Hd)==0;