📄 fshift.mht
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Date: Sat, 26 Apr 2008 08:21:27 +0800
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<BODY><PRE>function y =3D fshift(x,s)
% FSHIFT Fractional circular shift
% Syntax:
%
% >> y =3D fshift(x,s)
%
% FSHIFT circularly shifts the elements of vector x by a (possibly
% non-integer) number of elements s. FSHIFT works by applying a linear
% phase in the spectrum domain and is equivalent to CIRCSHIFT for =
integer
% values of argument s (to machine precision).
% (c) 2005 Francois Bouffard
% fbouffar@gel.ulaval.ca
needtr =3D 0; if size(x,1) =3D=3D 1; x =3D x(:); needtr =3D 1; end;
N =3D size(x,1);=20
r =3D floor(N/2)+1; f =3D ((1:N)-r)/(N/2);=20
p =3D exp(-j*s*pi*f)';=20
y =3D ifft(fft(x).*ifftshift(p)); if isreal(x); y =3D real(y); end;
if needtr; y =3D y.'; end;</PRE></BODY></HTML>
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