isconstant.m

来自「小波变换所有常见例程」· M 代码 · 共 17 行

function yesno = isconstant(P)

% ISCONSTANT -- check whether matrix polynomial is a constant matrix
%
%       yesno = isconstant(P)

% Copyright (c) 2004 by Fritz Keinert ([e-mail]),
% Dept. of Mathematics, Iowa State University, Ames, IA 50011.
% This software may be freely used and distributed for non-commercial
% purposes, provided this copyright statement is preserved, and
% appropriate credit for its use is given.
%
% Last update: Feb 20, 2004

P = trim(P);
yesno = (size(P.coef,3) == 1) & (P.min == 0);