evenodd.m

Digital Signal Processing Using MATLAB V.4随书代码

function [xe, xo, m] = evenodd(x,n)

% Real signal decomposition into even and odd parts

% -------------------------------------------------

% [xe, xo, m] = evenodd(x,n)

%

if any(imag(x) ~= 0)

      error('x is not a real sequence')

end

m = -fliplr(n);

m1 = min([m,n]); m2 = max([m,n]); m = m1:m2;

nm = n(1)-m(1); n1 = 1:length(n);

x1 = zeros(1,length(m));

x1(n1+nm) = x; x = x1;

xe = 0.5*(x + fliplr(x));

xo = 0.5*(x - fliplr(x));