You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: kaiser_bessel_ft.m
    path of file: ./repos/CS_MoCo_LAB/reconstruction/matlab/CS_LAB_matlab/utils/utils_SPIRiT
    
    the code of the file until where you have to start completion:  function y = kaiser_bessel_ft(u, J, alpha, kb_m, d)
    
function y = kaiser_bessel_ft(u, J, alpha, kb_m, d)
%function y = kaiser_bessel_ft(u, J, alpha, kb_m, d)
%
% Fourier transform of generalized Kaiser-Bessel function,
%	in dimension d (default 1).
%	shape parameter "alpha" (default 2.34 J)
%	order parameter "kb_m" (default 0)
% See (A3) in lewitt:90:mdi, JOSA-A, Oct. 1990.
% in
%	u	[M,1]	frequency arguments
% out
%	y	[M,1]	transform values
%
% Copyright 2001-3-30, Jeff Fessler, The University of Michigan

% if no arguments, make example plots
if nargin < 1
	help(mfilename)
	J = 5; alpha = 6.8;
	N = 2^10;
	x = [-N/2:N/2-1]'/N * (J+3)/2;
	dx = x(2) - x(1);
	du = 1 / N / dx;
	u = [-N/2:N/2-1]' * du;
	uu = 1.5*linspace(-1,1,201)';

	mlist = [-2 0 2 7];
	leg = {};
	for ii=1:length(mlist)
		kb_m = mlist(ii);
		yy(:,ii) = kaiser_bessel(x, J, alpha, kb_m);
		Yf(:,ii) = reale(fftshift(fft(fftshift(yy(:,ii))))) * dx;
		Y(:,ii) = kaiser_bessel_ft(u, J, alpha, kb_m, 1);
		Yu(:,ii) = kaiser_bessel_ft(uu, J, alpha, kb_m, 1);
		leg{ii} = sprintf('m=%d', kb_m);
	end